U.S. Department of the Interior

U.S. Geological Survey

Geochemical Database for Intrusive Rocks of

North-Central and Northeast Nevada

Data Series 244
Cover: The granodiorite of Toyn Creek forms prominent outcrops at Harrison Pass, Ruby Mountains, Nevada.
Geochemical Database for 

Intrusive Rocks of 

North-Central and Northeast Nevada

By Edward A. du Bray, Michael W. Ressel, and Calvin G. Barnes

Data Series 244

U.S. Department of the Interior

U.S. Geological Survey
U.S. Geological Survey, Reston, Virginia: 2007

Version 1.0

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Although this report is in the public domain, permission must be secured from the individual copyright owners to 

reproduce any copyrighted materials contained within this report.

Suggested citation:

du Bray, E.A., Ressel, M.W., and Barnes, C.G., 2007, Geochemical database for intrusive rocks of north-central and 

northeast Nevada: U.S. Geological Survey Data Series 244, 1 CD-ROM.

ISBN 1411317769

U.S. Department of the Interior

DIRK KEMPTHORNE, Secretary

U.S. Geological Survey

Mark D. Myers, Director
Contents

Introduction ....................................................................................................................................................1

Acknowledgments ........................................................................................................................................1

Intrusions of North-Central and Northeast Nevada—Constituents of the Database .......................4

Data Compilation Methods ..........................................................................................................................4

Data Fields ......................................................................................................................................................5

field_no. .................................................................................................................................................5

lithology .................................................................................................................................................5

ign_form .................................................................................................................................................5

alteration ...............................................................................................................................................6

long and lat ............................................................................................................................................6

SiO2, TiO2, Al2O3, FeO*, MnO, MgO, CaO, Na2O, K2O, and P2O5 ......................................................6

LOI, H2O+, H2O-, CO2, Cl, F, and S ........................................................................................................7

total_I ....................................................................................................................................................7

vol_sum ..................................................................................................................................................7

Ba, La, Ce, Rb, Sr, Y, Zr, Nb, Th, Ga, Co, Cr, Ni, Sc, V, Ag, Cu, Mo, Pb, Zn, and Au .....................7

chem_src ...............................................................................................................................................7

rad_age ..................................................................................................................................................8

uncert ...................................................................................................................................................8

age_src ..................................................................................................................................................9

geol_age ..............................................................................................................................................10

geol_age_src ......................................................................................................................................10

intrusion_name ...................................................................................................................................10

Qtz, Kfs, Pl, Maf, Opq, Ol, Pyx, Hbl, Bt, Ms, Acc, Gnm, and Alt ...................................................10

Histograms ...................................................................................................................................................10

References Cited .........................................................................................................................................11

Figures

1. Index map showing approximate distributions of intrusive rocks in north-central and northeast Nevada .....................................................................................................................................2

2. Frequency distribution histograms showing compositions of north-central and northeast 

Nevada intrusive rocks .................................................................................................................19

Table

1. Number of observations within each composition range for north-central and northeast 

Nevada intrusion database .........................................................................................................58

iii
Introduction

Data presented in this report pertain to the igneous 

intrusions of north-central and northeast Nevada and were 

compiled as part of the Metallogeny of the Great Basin project 

conducted by the U.S. Geological Survey between 2001 and 

2007. The geographic area addressed in this compilation is 

approximately bounded by lats 38.5° and 42°N., long 118.5° 

W., and the Nevada-Utah border (fig. 1). The area contains 

numerous large plutons and smaller stocks but also contains 

many small, shallowly emplaced intrusive bodies, including 

dikes, sills, and intrusive lava dome complexes. The age, 

composition, and geographic distribution of intrusions in 

north-central and northeast Nevada (hereafter, the study area) 

are summarized by du Bray and Crafford (2007). Intrusive 

igneous rocks, of multiple ages, are known to be major constituents of the geologic framework in the study area (Stewart 

and Carlson, 1978). Abundant middle to late Mesozoic and 

early to middle Cenozoic intrusions in the study area are probably byproducts of subduction-related processes, including 

back-arc magmatism, that prevailed along the west edge of the 

North American plate during this interval.

Ressel and others (2000) and Ressel and Henry (2006), 

for example, have highlighted the association between magmatism and ore deposits along the Carlin trend. Similarly, Theodore (2000) has demonstrated the association between igneous 

intrusions and ore deposits in the Battle Mountain area. 

Decades of geologic investigations in the study area demonstrate that many ore deposits, representing diverse ore deposit 

types, are spatially, and probably temporally and genetically, 

associated with igneous intrusions. Because of these associations, studies of many individual igneous intrusions have been 

completed, including those by a large number of Master’s and 

Doctoral thesis students (particularly University of Nevada at 

Reno students and associated faculty), economic geologists 

working on behalf of exploration and mining companies, and 

U.S. Geological Survey earth scientists. However, despite the 

number and importance of igneous intrusions in the study area, 

no synthesis of geochemical data available for these rocks has 

been completed.

Data compilations that are available for igneous intrusions in Nevada pertain to relatively restricted geographic 

areas and (or), in most cases, do not include the broad array of 

data that would aid interpretation of these rocks. Smith and 

others (1971) presented potassium-argon geochronologic and 

basic petrographic data for a few intrusions in north-central 

Nevada. Similarly, Silberman and McKee (1971) presented 

potassium-argon geochronologic data for a significant number 

of central Nevada intrusions. More recently, Mortenson and 

others (2000) presented uranium-lead geochronology for a 

small number of intrusions in the study area. Sloan and others (2003) released a national geochronologic database that 

contains age determinations made prior to 1991 for rocks of 

Nevada. Finally, Henry and Sloan (2003) compiled geochronologic data for igneous rocks of Nevada produced subsequent 

to completion of the Sloan and others (2003) compilation. 

Consequently, although age data for igneous rocks of Nevada 

have been compiled, data pertaining to compositional features 

of these rocks have not been systematically synthesized. Maldonado and others (1988) compiled the distribution and some 

basic characteristics of intrusive rocks throughout Nevada. 

Lee (1984), John (1983, 1987, and 1992), John and others 

(1994), and Ressel (2005) have compiled data that partially 

characterize igneous intrusions in various parts of Nevada. 

Contained in the text and data that follow is a more complete 

synthesis of composition and age data for igneous intrusions 

of the study area. The ultimate goal of this effort is an evaluation of the time-space-compositional evolution of Mesozoic 

and Cenozoic magmatism in the study area and identification 

of genetic associations between magmatism and mineralizing 

processes in this region.

Acknowledgments

We would like to thank a number of individuals who 

helped make this effort possible. The staff of the USGS 

Geochemical Database for Intrusive Rocks of 

North-Central and Northeast Nevada

By Edward A. du Bray, Michael W. Ressel1, and Calvin G. Barnes2

1

Newmont Mining Corporation

2

Texas Tech University
Figure 1 (above and following page). Index map (compiled from Crafford, in press) showing approximate distributions of intrusive rocks 

and analyzed samples, north-central and northeast Nevada. Thin purple line outlines the Metallogeny of the Great Basin project area 

(the geographic area within which analyses were compiled). A, Locations of intrusions, in red. B, Collection sites for samples included 

in database, indicated by blue plus symbols.

 Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada

Ely

Ione

Ruth

Lund

Elko

Midas

Deeth

Baker

Gabbs

Wells

Currie

Hadley

McGill

Luning

Eureka

Austin

Carlin

Owyhee

Beowawe

Contact

Minerva

Currant

Golconda

Jarbidge

Palisade

Lamoille

Montello

Eastgate

Lovelock

Tuscarora

Manhattan

Unionville

Winnemucca

West Wendover

Paradise Valley

Orovada

Cher

Creek

ry

Mountain

Round Mountain

Battle

Mountain

City

118°30'W 118°0'W 117°30'W 117°0'W 116°30'W 116°0'W 115°30'W 115°0'W 114°30'W 114°0'W

38°30'N

39°0'N

39°30'N

40°0'N

40°30'N

41°0'N

41°30'N

0 25 50 75 100 125 150 175 200 KILOMETERS

0 25 50 75 100 MILES

A

STUDY

AREA

NEVADA CALIFORNIA

OREGON IDAHO

UTAH

AZ
Introduction 

Figure 1. Index map showing approximate distributions of intrusive rocks and analyzed samples, north-central and northeast Nevada—

Continued.

Ely

Ione

Ruth

Lund

Elko

Midas

Deeth

Baker

Gabbs

Wells

Currie

Hadley

McGill

Luning

Eureka

Austin

Carlin

Owyhee

Beowawe

Contact

Minerva

Currant

Golconda

Jarbidge

Palisade

Lamoille

Montello

Eastgate

Lovelock

Tuscarora

Manhattan

Unionville

Winnemucca

West Wendover

Paradise Valley

Orovada

Mountain

Round Mountain

Battle

Mountain

City

Cher

Creek

ry

118°30'W 118°0'W 117°30'W 117°0'W 116°30'W 116°0'W 115°30'W 115°0'W 114°30'W 114°0'W

38°30'N

39°0'N

39°30'N

40°0'N

40°30'N

41°0'N

41°30'N

B 0 25 50 75 100 125 150 175 200 KILOMETERS

0 25 50 75 100 MILES

STUDY

AREA

NEVADA CALIFORNIA

OREGON IDAHO

UTAH

AZ
Denver library were critical to the success of this compilation. 

In particular, the library staff used the interlibrary loan process 

to obtain many of the geologic reports on which this 

compilation is based. We thank Joan Luce and Frances 

Vialpando for their tireless typing; data from many sources 

were available only in analog form and had to be painstakingly typed. Many geologic researchers gave tirelessly of their 

time to track down missing bits of information that allow this 

database to be as complete as it is. These individuals include 

M. Granitto, M.D. Barton, E. Seedorff, J. Nicholes, A.J. 

McGrew, J.F. Slack, S.W. Nelson, L.J. Garside, S.B. Keith, 

A.R. Wallace, J.L. Doebrich, D.R. Shawe, R.W. Kistler, E.H. 

McKee, R.L. Smith, T.G. Theodore, J.M. Hammarstrom, D.A. 

John, C.S. Rombach, A.W. Snoke, A.T. Strike, K.A. Howard, 

and S.P. Marsh. In addition we would like to thank Stan Keith 

(MagmaChem Exploration, Inc), Newmont Mining Corporation, and AngloGold Ashanti for contributing significant 

amounts of intrusive rock geochemical data. Finally, we gratefully acknowledge technical reviews by D.A. John and C.D. 

Henry that helped improve this report.

Intrusions of North-Central and Northeast 

Nevada—Constituents of the Database

The study area contains numerous large plutons and 

smaller stocks but also contains many smaller, shallowly 

emplaced intrusive bodies, including dikes, sills, and intrusive 

lava dome complexes. Many geologic investigations have 

demonstrated that intrusions in the study area are principally 

of three ages, Jurassic, Cretaceous, and Eocene. However, in 

the western part of the study area, a number of intrusions are 

thought to be of Triassic age (Johnson, 1977). Several small, 

shallowly emplaced Miocene-age intrusions have been delineated in various parts of the study area. This report pertains to 

intrusions of these ages but does not contain data for Paleozoic intrusions, principally very mafic, that are likely parts of 

detached, allocthonous thrust sheets.

Crafford (in press) recently completed compilation of a 

digital geologic map of Nevada using the Nevada Bureau of 

Mines and Geology county reports and accompanying geologic maps as primary sources. The new compilation is based 

mostly on the existing county maps and generally depicts 

geologic relations shown on those maps. As part of the digital 

recompilation, discontinuities across county boundaries were 

reconciled. The resulting compilation identifies many of 

the intrusions for which geochemical data were compiled. 

However, the database also includes data for intrusions, in 

many cases small intrusions, that were not identified on the 

county geologic maps. Background documentation for some 

analytical data presented in this report is incomplete and (or) 

may be misleading or incorrect, any of which could cause 

inclusion of inappropriate information in the database. Every 

effort has been made to preclude inclusion of misleading data; 

the amount of this type of data inadvertently included in the 

database is probably small and should not significantly affect 

data interpretation.

Data Compilation Methods

Several significant efforts to obtain new compositional 

data for intrusions in the study area preceded and served as 

a starting point for the effort documented here. S.B. Keith 

(MagmaChem Exploration, Inc.) obtained data for samples 

from several hundred intrusions in the Great Basin. Geologists 

employed by AngloGold Ashanti collected and analyzed an 

additional several hundred samples of intrusions in the study 

area as part of an exploration program. Most recently, as part 

of Ph.D. thesis research and subsequent investigations, M.W. 

Ressel collected and analyzed several hundred more samples 

of intrusions in the study area in an attempt to establish links 

between various intrusions and Carlin gold deposits.

Copies of original data source materials (subsequently 

referred to as sources), including published reports and Master’s and Doctoral theses, were used to add data to the database. Reference lists contained in sources of data were examined and used to identify additional data sources. In this way, 

data for about 2,800 samples from 93 sources were identified 

and incorporated in the database. We believe that this process 

has probably resulted in identification and incorporation of 

most of the compositional data that have been produced for 

samples of intrusions in the study area. In order for a sample 

to be included in the database, at least a sample number and 

major oxide analysis were required. Samples for which only 

trace element data were available were not included in the 

database. Additional trace element (for instance, the rare 

earths) and (or) isotopic data are available for some samples, 

but because the number of these samples is very small, these 

data were not included in the database. Small amounts of 

additional data can be gleaned by consulting the appropriate 

data sources. No effort was made to exclude hydrothermally 

altered samples from the compilation. Rather, all intrusive 

rock compositional data were compiled and samples known to 

be altered were coded accordingly. In a subsequent interpretive phase of this work, additional altered samples will be 

identified using standard geochemical criteria. The winnowing process will result in two derivative databases. The 

derivative database for essentially unaltered intrusive rocks 

will allow evaluation of time-space-composition relations 

between magmatism and ore genesis. The derivative database containing data for altered rocks will allow evaluation 

of hydrothermal alteration effects on primary rock compositions. Database users should be wary of samples with SiO2

abundances greater than 77 percent, initial analytic totals less 

than 95 percent or greater than 103 percent, Al2O3 abundances 

less than 10 percent or greater than 20 percent, total volatile 

contents greater than 5 percent, or Na2O/K2O ratios less than 1 

or greater than about 12; samples with any of these characteristics are likely altered and probably do not preserve primary 

 Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
igneous rock compositions. Data presented in source materials were included in the database, without modification (with 

the exception of normalization of major oxide, as described 

below), and all input subsequently verified.

Data were compiled using Microsoft Excel and can 

be accessed using software compatible with .xls files. The 

database release (file, NoNVintrusionGX.xls) includes several 

worksheets that are accessed using tabs arrayed along the base 

of the spreadsheet screen display. The tab labeled “Main NV 

db” accesses the primary data compilation. The tab labeled 

“db w censored data deleted” accesses a copy of the primary 

data compilation in which censored data (data coded as less 

than some specified value) were deleted prior to calculation of 

summary statistics and creation of histograms. The tab labeled 

“no loc” accesses data for samples contained in the U.S. 

Geological Survey National Geochemical Database for which 

accurate location data are unavailable. The database release 

also includes a tab-delimited, text file version of the database 

(file, NoNVintrusionGX.txt).

Data Fields

Data fields presented and described below represent 

those considered most critical to addressing questions concerning the tectonic, petrologic, and metallogenic evolution 

of magmatism in the study area. Data for each of these fields 

constitute a column, or set of related columns, in the database. 

Data in these columns can be sorted, queried, and interpreted 

to address questions concerning the history, development, and 

implications of magmatic activity in the study area. Sample 

number records are aggregated in blocks of data that share a 

primary geochemical data source.

Blank cells in the database indicate that no data are 

available for the corresponding column. Some sources report 

values of zero for some database fields. These values indicate 

that an abundance determination was attempted but that the 

constituent was not detected in the sample. Similarly, some 

sources present qualified data. In particular, records for some 

samples include less than (<) symbols. These data indicate 

that the constituent was detected but that its concentration was 

unquantifiable beyond the fact that its concentration is less 

than the indicated value. Actual analytical precision (number 

of significant figures) associated with each database entry is 

portrayed by each displayed onscreen value. Data in some 

cells appear to be more precise than displayed values, but 

this is a misleading artifact of computational processes (for 

instance, normalization to 100 percent volatile free), which 

may have been used to create data cell contents. Precision 

varies within individual columns in accordance with specific 

analytical protocols and the way data are reported in individual 

sources. In most cases, the number of significant figures 

defined in data sources was retained. However, in some cases, 

the level of precision implied is implausible given either the 

analytical protocol or the corresponding analytical state of the 

art; accordingly, some numeric data contained in the database 

have been rounded to indicate a plausible level of analytical 

precision.

field_no.

Identifiers for analyzed samples materials were compiled 

from sources and presented, without modification.

lithology

In most cases, a lithologic description of analyzed samples was compiled from information contained in sources. In 

accordance with procedures defined by the International Union 

of Geological Sciences, composition names for intrusive rocks 

are best defined using the relative modal proportions of quartz, 

alkali feldspar, and plagioclase relative to the classification 

scheme of Streckeisen (1973). The most informative sources 

present relative proportions of the feldspars and quartz in text 

accompanying geologic reports; this information was used 

to establish composition (or composition range) names for 

intrusions in the study area. Many publications that serve as 

sources for our compilation predate the classification recommendations of Streckeisen (1973); most of these used the 

classification of Johannsen (1931) to define compositions of 

intrusions in the study area. To the extent possible, and using 

whatever ancillary data were available, intrusion compositions 

were converted from the nomenclature of Johannsen (1931) 

to that of Streckeisen (1973). Most of these transformations 

were simple and obvious. However, the two nomenclature 

systems use the term quartz monzonite to define significantly 

different rocks. Most of the composition field called quartz 

monzonite by Johannsen (1931) is now referred to as monzogranite in the Streckeisen (1973) system. Not all source 

authors define which of the two classification schemes was 

used to categorize intrusion compositions, so some ambiguity persists. An effort was made to recast compositions to the 

Streckeisen (1973) system in cases for which sufficient data 

were available to achieve this with confidence that the integrity of primary source data was not compromised.

Many intrusions of the study area are shallowly emplaced 

and (or) subvolcanic bodies. As such, their grain size precludes petrographic modal analysis and classification using the 

Streckeisen (1973) system. These rocks are instead treated as 

volcanic rocks and their composition names were established 

based on their chemistry and the nomenclature grid described 

by Le Bas and others (1986).

ign_form

The form of the igneous intrusion represented by each 

sample is given where known. Samples coded as representing 

dikes or sills represent thin tabular bodies that are discordant 

and concordant with enclosing rocks, respectively. Larger 

Data Fields 
intrusive bodies, generally discordant to enclosing rocks, are 

coded as plutons, stocks, and plugs depending on their size; 

plutons are the largest of these bodies, whereas plugs are the 

smallest. In most cases, samples from intrusions coded as 

plutons represent bodies that cooled slowly, at the greatest 

depths, and are phaneritic, whereas samples from intrusions 

coded as plugs represent the subvolcanic environment, many 

have a quenched groundmass, and some may represent parts of 

endogenous to exogenous volcanic flow domes.

alteration

Many sources explicitly indicate that some analyzed 

samples are altered. Other sources provide sufficient descriptive information about samples that alteration can be inferred. 

Some sources simply indicate that samples are altered; these 

samples are simply coded as “Yes” in the “alteration” column. 

Other alteration terms used to code altered samples include 

advanced argillic (abbreviated “adv argillic”), phyllic, argillic, 

propylitic, potassic, skarn, greisen, silicification, oxidation, 

tourmaline, metamorphic, and deuteric. Each of these terms 

is applied in accordance with their standard usage, defined 

for instance by Guilbert and Park (1986). These terms are 

appended with a “?” when the proper alteration nomenclature 

is ambiguous due to the nature of available descriptive information.

long and lat

An effort was made to obtain location data for all samples 

with composition data. Most sources contain some form of 

location information. Missing sample location data were 

requested from authors, most of whom were able to provide 

missing information. Accordingly, location data are available for all but two samples. Latitude and longitude data 

are reported as decimal degrees (relative to the 1927 North 

American Datum). In the study area, longitude is reported as a 

negative value (western hemisphere) and latitude as a positive 

value (northern hemisphere).

Location data are of variable quality as a consequence of 

the manner in which they were initially acquired and subsequently reported. The number of significant figures presented 

as part of location data in the “long” and “lat” columns defines 

relative levels of sample location precision, as follows:

• four significant figures indicates that the given location 

is accurate within 10’s of meters,

• three significant figures indicates that the given location is accurate within 100’s of meters, and

• two significant figures indicates that the given location 

is accurate within 1,000’s of meters.

Some sources report sample location in terms of Township, Range, and section values, usually to the closest 1/4 of 

a section. Township-Range-section data were digitized to 

obtain decimal degree location; within the appropriate 1/4 

section quadrilaterals, digitized points were usually selected 

to coincide with a road, trail, stream bottom, quarry, or natural 

cliff, any of which might represent a likely sampling location. 

Some sources do not include numerical sample location data 

but do contain sample maps. Location data for these samples 

were obtained by digitizing sample sites. A very few sources 

merely describe sample locations; these were used to estimate 

a sample location, which was then digitized.

Some early records contained in the U.S. Geological 

Survey National Geochemical Database contain location data 

keyed to quadrangle corners. These location data, and therefore the associated composition data, are of uncertain utility. 

For the sake of completeness, and in the hope that location 

data can ultimately be recovered for these samples, composition data for these samples are compiled in a separate worksheet (tab = no loc) in the database. Data for these samples 

are not included in the histograms or the statistical measures.

SiO2, TiO2, Al2O3, FeO*, MnO, MgO, CaO, Na2O, 

K2O, and P2O5

Sources report whole rock, major oxide data in a variety 

of formats. In addition, these data were produced by a wide 

array of analytical procedures, each with its own associated 

analytical precision and accuracy. Compositions for many 

of the samples included in the database are presented in 

their sources already normalized to 100 percent volatile free. 

Some information loss occurs when data are reported solely 

in this fashion. Compiling analytical methods and associated estimates of precision and accuracy associated with the 

reported data was beyond the scope of this effort. Analytical 

protocols, precision, and accuracy were highly variable among 

sources. Fortunately, most sources document these parameters 

so that associated questions can be resolved by referring to the 

appropriate data source. The database includes columns for 

the abundances of SiO2, TiO2, Al2O3, FeO, MnO, MgO, CaO, 

Na2O, K2O, and P2O5. However, because diverse analytical 

protocols were used to analyze samples, not all sources contain data for each of these constituents.

Several different schemes are possible for reporting iron 

contents. In addition, reported abundances of ferrous versus 

ferric iron in many of these rocks are unlikely to represent 

magmatic values, because of oxidation during late- to postmagmatic hydrothermal alteration. Consequently, total iron 

abundances were recalculated as ferrous iron oxide and 

denoted as FeO*. Interaction with postmagmatic fluids caused 

compositions of many intrusive rocks of the study area to 

change in other ways as well. In particular, many of these 

rocks were hydrothermally altered (as indicated by secondary clay minerals, sericite, and (or) chlorite). Both processes 

caused volatile contents of the affected samples to increase, 

and correspondingly caused relative abundances of all other 

constituents to decrease. Therefore, to facilitate meaningful 

oxide abundance comparisons among samples, all analyses 

 Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
were normalized to 100 percent on a volatile-free basis. The 

resulting data are reported in columns identified by SiO2, TiO2, 

Al2O3, FeO*, MnO, MgO, CaO, Na2O, K2O, and P2O5. All 

data are reported as weight percent.

LOI, H2O+, H2O-, CO2, Cl, F, and S

Data sources report volatile constituent contents of 

samples from intrusions in the study area in widely disparate 

ways. In order to capture important information concerning 

the volatile contents of these rocks, an array of data columns 

was designated to account for various analytical protocols 

and data reporting formats. Volatile constituents whose 

abundances are commonly determined include LOI (loss on 

ignition), H2O+ (bound), H2O- (nonessential, moisture), CO2, 

Cl, F, and S. Of these, few sources contain halogen and S 

abundance data. Similarly, data for H2O+, H2O-, and CO2 are 

rarely and nonsystematically reported. However, given the 

potential importance of these constituents in hydrothermal 

processes, compiling all available data for these components 

seems warranted. Several sources present data for H2O and do 

not specify whether this species is bound water (+) or nonessential moisture (-). These data have been included in the 

H2O+ column of the database.

total_I

One measure of major oxide analytical accuracy is how 

nearly the sum of the determined constituents approaches 

100 percent. Consequently, the database includes a column 

that reports initial analytical totals as reported by the source. 

Some sources do not include totals; totals for these samples 

were computed and added to the database. Initial analytical 

totals reported in the sources were spot checked for accuracy; 

discrepancies were noted and corrected in a number of cases. 

Many sources present abundances for the oxides listed above 

but include no abundance data for volatile constituents. Initial 

analytical totals for these samples tend to be several to 5 or 

6 percent less than 100 percent. Unfortunately, it is impossible to determine whether these low initial totals result from 

inaccurate analyses and (or) unreported volatile constituent 

abundances.

vol_sum

The total volatile content of intrusions in the study area 

can provide some insight concerning whether abundances 

of other constituents accurately represent primary magmatic 

values. Samples with elevated volatile contents, for example 

greater than 3 weight percent, are likely to have experienced 

some fluid-mediated, postmagmatic chemical modification. 

Given the wide range of analytical protocols used in analysis 

of these samples, the best possible measure of sample volatile content is total volatile content. For the purposes of the 

compilation, if LOI data are the only information contained 

in source data compilations concerning volatile content, LOI 

values were designated as total volatile content. Alternatively, 

if the source includes data for H2O+, H2O-, CO2, Cl, F, or S, 

these data were summed to yield total volatile content. All 

data are presented as weight percent.

Ba, La, Ce, Rb, Sr, Y, Zr, Nb, Th, Ga, Co, Cr, Ni, Sc, 

V, Ag, Cu, Mo, Pb, Zn, and Au

The sources present data for inconsistent sets of trace 

elements. Of these, data for Ba, La, Ce, Rb, Sr, Y, Zr, Nb, 

Th, Ga, Co, Cr, Ni, Sc, V, Ag, Cu, Mo, Pb, Zn, and Au were 

compiled; all data are in parts per million. These constituents 

are among those for which sources most often contain data 

and also are considered sufficient to address many petrologic, 

tectonic, and metallogenic questions.

chem_src

Chemical, petrographic, and location data for each 

sample included in the database were compiled from primary data sources, in most cases a single source. For a few 

samples, data were culled from two or more sources; for 

example, major oxide data may have been compiled from one 

source and trace element data from another. Most entries in 

the “chem_src” column of the database are keyed numerically 

to sources identified in the following list. However, some of 

these data were compiled from sources principally dedicated 

to presenting geochronologic data. Alpha-coded entries in 

the “chem_src” column correspond to sources identified in 

the “age_src” section of this report. Sources of geochemical 

information include publications of the U.S. Geological Survey, unpublished data contained in the U.S. Geological Survey 

National Geochemical Database, Master’s theses, Doctoral 

dissertations, articles published in journals, and publications of 

the Nevada Bureau of Mines and Geology.

1. Henry and Faulds (1999)

2. Gilluly and Masursky (1965)

3. Erickson and others (1978)

4. Henry and Boden (1998)

5. Henry, C.D., Nevada Bureau of Mines and Geology, 

unpublished data, 2006

6. Henry and others (1999)

7. Willden (1964)

8. Shaver and Jeanne (1996)

9. Muffler (1964)

10. Gilluly and Gates (1965)

11. Shawe and others (1962)

12. Hotz and Willden (1964)

13. Johnson (1977)

14. Theodore (2000)

15. du Bray, E.A., U.S. Geological Survey, unpublished data, 

2006

16. Roberts (1964)

Data Fields 
17. Theodore and others (1973)

18. Theodore and others (1992)

19. Doebrich (1995)

20. Smith and others (1971)

21. Lee and others (1981)

22. Lee and Van Loenen (1971)

23. Barnes and others (2001)

24. Lee and others (2003)

25. Emsbo and others (2003)

26. Lee (1984)

27. Ressel, M.W., Newmont Mining Corporation, unpublished data, 2006

28. Ressel (2005)

29. Seymour (1980)

30. Emmons and Eng (1995)

31. Thole and Prihar (1998)

32. James (1976)

33. Lawson (1906)

34. Bauer and others (1966)

35. Drewes (1967)

36. Spencer (1917)

37. Shawe (1961)

38. Fournier (1967)

39. Phinisey (1995)

40. Evans (1974)

41. Radtke (1985)

42. Nosker (1981)

43. John (1997)

44. Hargrove (1982)

45. Taylor (1982)

46. Pullman (1983)

47. Smith (1981)

48. Henry (1996)

49. McKee (1976a)

50. Ferguson (1924)

51. Knopf (1924)

52. Hague (1892)

53. Clark (1922)

54. Vikre (1985)

55. McGrew, A.J., University of Dayton, unpublished data, 

2006

56. Hofstra (1994)

57. Barnes, C.G., Texas Tech University, unpublished data, 

2006

58. Boden (1987)

59. John (1992)

60. U.S. Geological Survey, National Geochemical Database, 

2006

61. Shawe and Lepry (1985)

62. Starkey (1987)

63. Myers (1994)

64. Merriam and Anderson (1942)

65. Smith and Ketner (1976)

66. Silberman and others (1974)

67. Thurber (1982)

68. Gibbons (1973)

69. Nelson (1975)

70. Kistler and others (1981)

71. Sayeed (1973)

72. Bonham and others (1991)

73. Brooks (1994)

74. Brooks and others (1991)

75. Keith, S.B., MagmaChem Exploration, Inc., unpublished 

data, 2006

76. Anglo Gold Ashanti, unpublished data, 2006

77. Putney (1985)

78. Clarke (1915)

79. Johnson and Keith (1991)

80. John and others (2000)

81. Ressel and others (2000)

82. Missallati (1973)

83. John, D.A., U.S. Geological Survey, and Henry, C.D., 

Nevada Bureau of Mines and Geology, unpublished data, 

2006

84. John, D.A., U.S. Geological Survey, unpublished data, 

2006

85. Wrucke and Silberman (1975)

86. Shawe (2003)

87. Wrucke and Armbrustmacher (1973)

88. Strike (2000)

89. Burton (1997)

90. Lee (1999)

91. Batum (1999)

92. Burling (1996)

93. Jeon (1999)

rad_age

The ages of the intrusions in the study area have been of 

keen interest and a large number of age determinations have 

been made. The database column titled “rad_age” contains 

geochronologically determined ages, in millions of years, for 

samples of intrusions in the study area. Multiple geochronologic age determinations (including U-Pb zircon, Ar-Ar, 

Rb-Sr, and K-Ar ages) have been obtained for some intrusions. 

A listing of the various geochronologic techniques, arranged 

in order of decreasing accuracy, is as follows: U-Pb zircon, 

Ar-Ar, Rb-Sr, and K-Ar. Preferred age estimates recorded in 

the “rad_age” column reflect this reliability ranking. K-Ar 

age determinations have been made for both biotite and hornblende mineral separates of some samples. In these cases, age 

determinations derived from hornblende are included in the 

database in preference to those for biotite. Fission-track age 

determinations were not included in the compilation.

uncert

The database column titled “uncert” contains data, in 

millions of years, for the analytical uncertainties (as presented 

in the source) associated with each of the age determinations 

reported in the “rad_age” column.

 Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
age_src

Sloan and others (2003) and C.D. Henry (Nevada Bureau 

of Mines and Geology, unpublished data, 2006) have compiled 

(and recalculated ages using currently accepted decay constants, as appropriate) most of the isotopic age data available 

for intrusions in the study area. Their compilations were used 

to identify the primary data sources (identified in the database 

column titled “age_src”) from which moderately abundant 

geochronologic data for the intrusions in the study area were 

extracted to compile ages of samples included in the database. In most cases, geochemical and geochronologic data are 

contained in the same source; the age source for each of these 

samples is numerically keyed to a previously identified source 

of geochemical data (database column “chem_src”). For the 

relatively small number of samples for which geochemical and 

geochronologic data have different sources, age source(s) data 

are keyed to alpha-coded citations listed below:

A. Silberman and McKee (1971)

B. Lee and others (1980)

C. Lee and others (1970)

D. Lee and others (1986)

E. Mortensen and others (2000)

F. Kistler and Lee (1989)

G. Coats and others (1965)

H. McDowell and Kulp (1967)

I. Miller and others (1988)

J. Kelson and others (2000)

K. Farmer (1996)

L. Armstrong (1970a)

M. Ketner (1998)

N. Evans and Ketner (1971)

O. McKee (1992)

P. Doebrich (1994)

Q. Wells and others (1971)

R. Shawe (1999)

S. Mueller (1992)

T. James (1972)

U. Gans and others (1989)

V. Hofstra and others (1999)

W. Ketner (1990)

X. McKee and others (1971)

Y. McKee and Silberman (1970)

Z. Marvin and Cole (1978)

AA. Shawe (1995)

AB. Maher and others (1990)

AC. Tingley (1975)

AD. Carlson and others (1975)

AE. Morabbi (1980)

AF. Armstrong (1966)

AG. Rahl and others (2002)

AH. Morton and others (1977)

AI. Armstrong (1970b)

AJ. Marvin and Dobson (1979)

AK. Maher (1989)

AL. Hudson and others (2000)

AM. Elison and others (1990)

AN. John and Robinson (1989)

AO. Stablein (1969)

AP. Krueger and Schilling (1971)

AQ. Miller and others (1990)

AR. Marvin and others (1989)

AS. Schilling (1965)

AT. Pullman (1984)

AU. John (1983)

AV. McGrew and others (2000)

AW. Ross (1961)

AX. Garside and others (1981)

AY. Bryan (1972)

AZ. Shawe and others (1986)

BA. John (1993)

BB. Coats (1987)

BC. Whitebread (1994)

BD. Gilluly (1967)

BE. Decker (1962)

BF. Coats (1971)

BG. Willden and Speed (1974)

BH. Armstrong and Suppe (1973)

BI. Hose and others (1976)

BJ. Lee and others (1999)

BK. McKee and others (1976)

BL. Nolan and others (1974)

BM. Kleinhampl and Ziony (1984)

BN. Speed and McKee (1976)

BO. Slack (1974)

BP. Coats and McKee (1972)

BQ. Coats and Greene (1984)

BR. Coash (1967)

BS. McKee (1976b)

BT. Ekren and Byers (1985)

BU. Evernden and Kistler (1970)

BV. Miller and others (1987)

BW. Edwards and McLaughlin (1972)

BX. Westra and Riedell (1996)

BY. Moores and others (1968)

BZ. Hart and Carlson (1985)

CA. Speed and Armstrong (1971)

CB. Hardyman and others (1988)

CC. McKee (1968)

CD. Stewart and McKee (1977)

CE. Ressel, M.W., Newmont Mining Corporation, and 

Henry, C.D., Nevada Bureau of Mines and Geology, 

unpublished data, 2006

CF. Silberling and John (1989)

CG. Ekren and Byers (1986)

CH. Hope (1972)

CI. O’Neill (1968)

CJ. Wooden and others (1999)

Data Fields 
geol_age

Radiometric ages have not been determined for most 

samples included in the database. However, all identified age 

determinations and geologic and geochronologic reasoning 

have been used to develop preferred geologic age estimates for 

most volumetrically significant intrusions in the study area. 

Geologic ages where given in years are rounded to the nearest 

million, which seems appropriate given the nature of this compilation. No effort was made to establish geologic ages for 

samples of dikes, sills, and other volumetrically insignificant 

intrusions. No entry is recorded in the “geol_age” column 

when the associated sample has been radiometrically dated.

geol_age_src

Estimates of geologic age for many of the intrusions in 

the study area rely upon geologic inference, correlations, and 

other diverse data sources; these sources are identified in the 

“geol_age_src” column of the database. Digits left of the “\” 

symbol identify the principal source used to establish geologic 

age. These digits are keyed to entries previously identified in 

either the “chem_src” or “age_src” discussions above. Digits 

to the right of the “\” symbol identify the rationale used to 

establish geologic age. Entries coded as “\1” indicate that a 

correlation of map units figure or some discussion of intrusion age in the source provides the basis for the geologic age 

assignment. In contrast, entries coded as “\2” indicate that the 

radiometric age of sample(s) that are not part of the database, 

but representative of the same intrusion as sample(s) that are 

included in the database, was used to establish geologic age.

intrusion_name

We established a unique geographic name for each 

phaneritic intrusion delineated on the digital geologic map of 

Nevada (Crafford, in press); these designations are compiled 

in the “intrusion_name” column of the database. The sources 

used to establish intrusion ages and compositions were also 

consulted for geographic name designation. Intrusion names 

identified in the sources were adopted in our compilation. The 

sources did not identify geographic names for all intrusions 

in the study area. In these cases, a nearby named geographic 

feature was adopted and assigned as the intrusion name. 

Assigned geographic intrusion names are not designations 

in the sense of stratigraphic nomenclature. However, geographic names presented in this compilation are in accord with 

established stratigraphic nomenclature for intrusions for which 

either formal or informal stratigraphic nomenclature exists, 

and to the extent that the sources identified these names.

Qtz, Kfs, Pl, Maf, Opq, Ol, Pyx, Hbl, Bt, Ms, Acc, 

Gnm, and Alt

In addition to their geochemical characteristics, the composition of intrusive rocks can be quantified in terms of the 

relative abundances of the minerals they contain. This type 

of characterization, modal analysis, is accomplished by point 

counting either thin sections using a petrographic microscope 

or stained slabs using a low magnification binocular microscope. The effort involved in conducting these types of modal 

analyses is time consuming and difficult, with the consequence 

that this type of data is rarely collected. However, since modal 

data are precisely the type of information required to classify 

the composition of phaneritic intrusive rocks (Streckeisen, 

1973), compilation of this type of data, as it was encountered in the literature, seemed warranted. This section of the 

database contains columns for the relative abundances (summing to about 100 percent) in volume percent of quartz (Qtz), 

alkali-feldspar (Kfs), plagioclase (Pl), the sum of all mafic 

minerals, including micas, hornblende, and iron-titanium 

oxides (Maf), opaque iron-titanium oxide minerals (Opq), 

olivine (Ol), pyroxene (Pyx), hornblende (Hbl), biotite (Bt), 

muscovite (Ms), accessory minerals (Acc), groundmass minerals (Gnm), and alteration minerals (Alt). Most of these species are self evident. The common accessory minerals include 

zircon, titanite, apatite, allanite, and fluorite. Groundmass 

pertains to typically very finely crystalline, aphanitic, or glassy 

rock whose mineral identity is not easily decipherable using a 

microscope. Alteration minerals include epidote, sericite, carbonate minerals, chlorite, clay minerals, zeolite, and anhydrite. 

All modal data were extracted from the same sources as those 

containing compiled geochemical data.

Histograms

A series of histograms (fig. 2) is included in order to provide a basic graphical depiction of the compiled data. These 

histograms portray frequency distributions for the abundances 

of each geochemical constituent for which data were compiled. In order to prepare each histogram, a table of data abundance classes (bins) versus frequency within each class was 

computed (table 1). A set of descriptive statistical abundance 

parameters, including mean and standard deviation, median, 

minimum, maximum, and count (number of samples for which 

abundance data for the particular constituent are available), 

were computed for each database geochemical constituent and 

are included on the histograms. For the purpose of constructing the histograms and calculating statistics, all censored (less 

than) values were deleted. The worksheet tab labeled “db w 

censored data deleted” is a copy of the primary database with 

all censored data deleted.

10 Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
References Cited

Armstrong, R.L., 1966, K-Ar dating using neutron activation for Ar analysis—Granitic plutons of the eastern Great 

Basin, Nevada and Utah: Geochimica et Cosmochimica 

Acta, v. 30, p. 565–600.

Armstrong, R.L., 1970a, Geochronology of Tertiary igneous 

rocks, eastern Basin and Range province, western Utah, 

eastern Nevada, and vicinity, U.S.A.: Geochimica et Cosmochimica Acta, v. 34, p. 203–232.

Armstrong, R.L., 1970b, K-Ar dating using neutron activation for Ar analysis—Comparison with isotope dilution 

Ar analyses: Geochimica et Cosmochimica Acta, v. 34, p. 

233–236.

Armstrong, R.L., and Suppe, J., 1973, Potassium-argon geochronometry of Mesozoic igneous rocks in Nevada, Utah, 

and southern California: Geological Society of America 

Bulletin, v. 84, p. 1375–1391.

Barnes, C.G., Burton, B.R., Burling, T.C., Wright, J.E., and 

Karlsson, H.R., 2001, Petrology and geochemistry of the 

Harrison Pass pluton, Ruby Mountains core complex, northeastern Nevada: Journal of Petrology, v. 42, p. 901–929.

Batum, Melissa, 1999, Petrology of late Cretaceous and 

Cenozoic granitic rocks, East Humboldt Range, northeastern Nevada: Lubbock, Tex., Texas Tech University Master’s 

thesis, 167 p.

Bauer, H.L., Jr., Breitrick, R.A., Cooper, J.J., and Anderson, 

J.A., 1966, Porphyry copper deposits in the Robinson mining district, Nevada, in Titley, S.R., and Hicks, C.L., eds., 

Geology of the porphyry copper deposits, southwestern 

North America: Tucson, Ariz., The University of Arizona 

Press, p. 232–244.

Boden, D.R., 1987, Geology, structure, petrology, and mineralization of the Toquima caldera complex, central Nevada: 

Palo Alto, Calif., Stanford University Ph.D. dissertation, 

285 p.

Bonham, H.F., Jr., Desilets, M.O., Garside, L.J., and Hsu, 

L.C., 1991, Geochemical sampling and characterization of 

Mesozoic rocks in the Winnemucca 30’ by 60’ quadrangle, 

Nevada: Nevada Bureau of Mines and Geology, unpublished contract report.

Brooks, J.W., 1994, Petrology and geochemistry of the McCoy 

gold skarn, Lander County, Nevada: Pullman, Wash., 

Washington State University Ph.D. thesis, 722 p.

Brooks, J.W., Meinert, L.D., Kuyper, B.A., and Lane, M.L., 

1991, Petrology and geochemistry of the McCoy gold 

skarn, Lander County, Nevada, in Raines, G.L., Lisle, R.W., 

Schafer, R.W., and Wilkinson, W.H., eds., Geology and ore 

deposits of the Great Basin Symposium Proceedings: Geological Society of Nevada, p. 419–442.

Bryan, D.P., 1972, The geology and mineralization of the 

Chalk Mountain and Westgate mining districts, Churchill 

County, Nevada: Reno, Nev., University of Nevada M.S. 

thesis, 78 p.

Burling, T.C., 1996, Magmatism associated with extension, 

Harrison Pass Pluton, Ruby Mountains, Nevada: Lubbock, 

Tex., Texas Tech University Master’s thesis, 136 p.

Burton, B.R., 1997, Structural geology and emplacement history of the Harrison Pass pluton, central Ruby Mountains, 

Elko County, Nevada: Laramie, Wyo., University of Wyoming Ph.D. dissertation, 295 p.

Carlson, J.E., Laird, D.W., Peterson, J.A., Schilling, J.H., 

Silberman, M.L., and Stewart, J.H., 1975, Preliminary map 

showing distribution and isotopic ages of Mesozoic and 

Cenozoic intrusive rocks in Nevada: U.S. Geological Survey Open-File Report 75–499, scale 1:1,000,000.

Clark, C.W., 1922, Geology and ore deposits of the Santa Fe 

district, Mineral County, Nevada: University of California, 

Bulletin of the Department of Geology, v. 14, no. 1, 74 p.

Clarke, F.W., 1915, Analyses of rocks and minerals from the 

laboratory of the U.S. Geological Survey 1880 to 1914: 

U.S. Geological Survey Bulletin 591, 376 p.

Coash, J.R., 1967, Geology of the Mount Velma quadrangle, 

Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin 68, 21 p.

Coats, R.R., 1971, Geologic map of the Owyhee quadrangle, 

Nevada-Idaho: U.S. Geological Survey Miscellaneous Geologic Investigations Map I–665, scale 1:48,000.

Coats, R.R., 1987, Geology of Elko County, Nevada: Nevada 

Bureau of Mines and Geology Bulletin 101, 112 p.

Coats, R.R., and Greene, R.C., 1984, Geologic map of the 

northeast quarter of the Mountain City quadrangle, Elko 

County, Nevada, and Owyhee County, Idaho: U.S. Geological Survey Open-File Report 84–684, scale 1:24,000.

Coats, R.R., Marvin, R.F., and Stern, T.W., 1965, Reconnaissance of mineral ages of plutons in Elko County, Nevada, 

and vicinity: U.S. Geological Survey Professional Paper 

525–D, p. D11–D15.

Coats, R.R., and McKee, E.H., 1972, Ages of plutons and 

types of mineralization, northwestern Elko County, Nevada: 

U.S. Geological Survey Professional Paper 800–C, p. 

C165–C168.

References Cited 11
Crafford, A.E.J., in press, Nevada State digital geologic map: 

U.S. Geological Survey Data Series 249.

Decker, R.W., 1962, Geology of the Bull Run quadrangle, 

Elko County, Nevada: Nevada Bureau of Mines and Geology Bulletin 60, 65 p.

Doebrich, J.L., 1994, Preliminary geologic map of the Galena 

Canyon 7.5-minute quadrangle, Lander County, Nevada: 

U.S. Geological Survey Open-File Report 94–664, 14 p.

Doebrich, J.L., 1995, Geology and mineral deposits of 

the Antler Peak 7.5-minute quadrangle, Lander County, 

Nevada: Nevada Bureau of Mines and Geology Bulletin 

109, 44 p.

Drewes, Harald, 1967, Geology of the Connors Pass quadrangle, Schell Creek Range, east-central Nevada: U.S. 

Geological Survey Professional Paper 557, 93 p.

du Bray, E.A., and Crafford, A.E.J., 2007, Composition and 

age of intrusions in north-central and northeast Nevada: 

U.S. Geological Survey Data Series 250, 1 CD-ROM.

Edwards, George, and McLaughlin, W.A., 1972, Shell list 

No.1; K-Ar and Rb-Sr age determinations of California, 

Nevada and Utah rocks and minerals: Isochron/West, No. 

3, p. 1–7.

Ekren, E.B., and Byers, F.M., 1985, Geologic map of the Win 

Wan Flat, Kinkaid NW, Kinkaid, and Indian Head Peak 

quadrangles, Mineral County, Nevada: U.S. Geological 

Survey Miscellaneous Investigations Series Map I–1578, 

scale 1:48,000.

Ekren, E.B., and Byers, F.M., 1986, Geologic map of the 

Mount Annie NE, Mount Annie, Ramsey Spring, and 

Mount Annie SE quadrangles, Mineral and Nye Counties, 

Nevada: U.S. Geological Survey Miscellaneous Investigations Series Map I–1579, scale 1:48,000.

Elison, M.W., Speed, R.C., and Kistler, R.W., 1990, Geologic 

and isotopic constraints on the crustal structure of the northern Great Basin: Geological Society of America Bulletin, v. 

102, p. 1077–1092.

Emmons, D.L., and Eng, T.L., 1995, Geologic map of the 

McCoy mining district, Lander County, Nevada: Nevada 

Bureau of Mines and Geology Map 103, scale 1:12,000, 12 

p.

Emsbo, Poul, Hofstra, A.H., Lauha, E.A., Griffin, G.L., and 

Hutchinson, R.W., 2003, Origin of high-grade gold ore, 

source of ore fluid components, and genesis of the Meikle 

and neighboring Carlin-type deposits, northern Carlin trend, 

Nevada: Economic Geology, v. 98, p. 1069–1105.

Erickson, R.L., Silberman, M.L., and Marsh, S.P., 1978, Age 

and composition of igneous rocks, Edna Mountain quadrangle, Humboldt County, Nevada: U.S. Geological Survey 

Journal of Research, v. 6, no. 6, p. 727–743.

Evans, J.G., 1974, Geology of the Rodeo Creek NE and 

Welches Canyon quadrangles, Eureka County, Nevada: 

U.S. Geological Survey Bulletin 1173, 81 p.

Evans, J.G., and Ketner, K.B., 1971, Geologic map of the 

Swales Mountain quadrangle and part of the Adobe Summit 

quadrangle, Elko County, Nevada: U.S. Geological Survey 

Miscellaneous Geologic Investigations Map I–667, scale 

1:24,000.

Evernden, J.F., and Kistler, R.W., 1970, Chronology of 

emplacement of Mesozoic batholithic complexes in California and western Nevada: U.S. Geological Survey Professional Paper 623, 42 p.

Farmer, M., 1996, An intrusive study of the Bluestar subdistrict: Denver, Colo., Newmont Gold Company, internal 

report, 33 p.

Ferguson, H.G., 1924, Geology and ore deposits of the Manhattan district, Nevada: U.S. Geological Survey Bulletin 

723, 163 p.

Fournier, R.O., 1967, The porphyry copper deposit exposed 

in the Liberty open-pit mine near Ely, Nevada; Part II; The 

formation of hydrothermal alteration zones: Economic 

Geology, v. 62, p. 207–227.

Gans, P.B., Mahood, G.A., and Schermer, E., 1989, Synextensional magmatism in the Basin and Range Province; A case 

study from the eastern Great Basin: Geological Society of 

America Special Paper 233, 53 p.

Garside, L.J., Bonham, H.F., Jr., Ashley, R.P., Silberman, 

M.L., and McKee, E.H., 1981, Radiometric ages of volcanic and plutonic rocks and hydrothermal mineralization 

in Nevada—Determinations run under the USGS-NBMG 

Cooperative Program: Isochron/West, no. 30, p. 11–19.

Gibbons, J.A., 1973, The geology of part of the Contact mining district, Elko County, Nevada: Reno, Nev., University 

of Nevada M.S. thesis 181 p.

Gilluly, James, 1967, Geologic map of the Winnemucca quadrangle, Pershing and Humboldt Counties, Nevada: U.S. 

Geological Survey Geologic Quadrangle Map GQ–656, 

scale 1:62,500.

Gilluly, James, and Gates, Olcott, 1965, Tectonic and igneous 

geology of the northern Shoshone Range, Nevada: U.S. 

Geological Survey Professional Paper 465, 153 p.

12  Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
Gilluly, James, and Masursky, Harold, 1965, Geology of the 

Cortez quadrangle, Nevada, with a section on Gravity and 

aeromagnetic surveys by D.R. Mabey: U.S. Geological 

Survey Bulletin 1175, 117 p.

Guilbert, J.M., and Park, C.F., Jr., 1986, The geology of ore 

deposits: New York, W.H. Freeman and Company, 985 p.

Hague, Arnold, 1892, Geology of the Eureka district, Nevada: 

U.S. Geological Survey Monograph 20, 419 p.

Hardyman, R.F., Brooks, W.E., Blaskowski, M.J., Barton, 

H.N., Ponce, D.A., and Olson, J.E., 1988, Mineral resources 

of the Clan Alpine Mountains Wilderness Study Area, 

Churchill County, Nevada: U.S. Geological Survey Bulletin 

1727–B, 16 p.

Hargrove, H.R., 1982, Geology of the southern portion of the 

Montana Mountains, McDermitt caldera, Nevada: Tempe, 

Ariz., Arizona State University M.S. thesis, 202 p.

Hart, W.K., and Carlson, R.W., 1985, Distribution and geochronology of Steens Mountain-type basalt from the northwestern Great Basin: Isochron/West, no. 43, p. 5–10.

Henry, C.D., 1996, Geologic map of the Bell Canyon quadrangle, western Nevada: Nevada Bureau of Mines and Geology Field Studies Map 11, scale 1:24,000.

Henry, C.D., and Boden, D.R., 1998, Geologic map of the 

Mount Blitzen quadrangle, Elko County, northeastern 

Nevada: Nevada Bureau of Mines and Geology Map 110, 

scale 1:24,000, 20 p.

Henry, C.D., Boden, D.R., and Castor, S.C., 1999, Geologic 

map of the Tuscarora quadrangle, Nevada: Nevada Bureau 

of Mines and Geology Map 116, scale 1:24,000, 20 p.

Henry, C.D., and Faulds, J.E., 1999, Geologic map of the Emigrant Pass quadrangle, Nevada: Nevada Bureau of Mines 

and Geology Open-File Report 99–9, scale 1:24,000.

Henry, C.D., and Sloan, J., 2003, Isotopic age database for the 

Great Basin and adjacent regions: Nevada Bureau of Mines 

and Geology, available at URL http://mapserver.library.

unr.edu/website/dataworksweb/NevadaRocks/viewer.htm 

(accessed July 2006).

Hofstra, A.H., 1994, Geology and genesis of Carlin-type gold 

deposits in the Jerritt Canyon district, Nevada: Boulder, 

Colo., University of Colorado Ph.D. thesis, 287 p.

Hofstra, A.H., Snee, L.W., Rye, R.O., Folger, H.W., Phinesey, 

J.D., Loranger, R.J., Dahl, A.R., Naeser, C.W., Stein, H.J., 

and Lewchuk, M., 1999, Age constraints on Jerritt Canyon 

and other Carlin-type gold deposits in the western United 

States—Relationship to mid-Tertiary extension and magmatism: Economic Geology, v. 94, no. 6, p. 769–794.

Hope, R.A., 1972, Geologic map of the Spruce Mountain 

quadrangle, Elko County, Nevada: U.S. Geological Survey 

Geologic Quadrangle Map GQ–942, scale 1:62,500.

Hose, R.K., Blake, M.C., Jr., and Smith, R.M., 1976, Geology and mineral resources of White Pine County, Nevada: 

Nevada Bureau of Mines and Geology Bulletin 85, 105 p.

Hotz, P.E., and Willden, Ronald, 1964, Geology and mineral 

deposits of the Osgood Mountains quadrangle, Humboldt 

County, Nevada: U.S. Geological Survey Professional 

Paper 431, 128 p.

Hudson, M.R., John, D.A., Conrad, J.E., and McKee, E.H., 

2000, Style and age of late Oligocene–early Miocene 

deformation in the southern Stillwater Range, west-central 

Nevada—Paleomagnetism, geochronology, and field relations: Journal of Geophysical Research, v. 105, p. 929–954.

James, L.P., 1972, Zoned hydrothermal alteration and ore 

deposits in sedimentary rocks near mineralized intrusions, 

Ely area, Nevada: University Park, Pa., Pennsylvania State 

University Ph.D. thesis, 280 p.

James, L.P., 1976, Zoned alteration in limestone at porphyry 

copper deposits, Ely, Nevada: Economic Geology, v. 71, p. 

488–512.

Jeon, Mi-Ae, 1999, Petrology and stable isotope study of 

metamorphic and granitic rocks in Lamoille Canyon, Ruby 

Mountains, Nevada: Lubbock, Tex., Texas Tech University 

Master’s thesis, 151 p.

Johannsen, A., 1931, A descriptive petrography of the igneous 

rocks, v. 1: Chicago, University of Chicago Press, 267 p.

John, D.A., 1983, Map showing distribution, ages, and petrographic characteristics of Mesozoic plutonic rocks in the 

Walker Lake 1° by 2° quadrangle, California and Nevada: 

U.S. Geological Survey Miscellaneous Field Studies Map 

MF–1382–B, scale 1:250,000.

John, D.A., 1987, Map showing the distribution and characteristics of plutonic rocks in the Tonopah 1° by 2° quadrangle, 

central Nevada: U.S. Geological Survey Miscellaneous 

Field Studies Map MF–1877–J, scale 1:250,000.

John, D.A., 1992, Chemical analyses of granitic rocks in the 

Reno 1° by 2° quadrangle and in the northern Pine Nut 

Mountains, west-central Nevada: U.S. Geological Survey 

Open-File Report 92–246, 35 p.

John, D.A., 1993, Geologic map of the Job Peak quadrangle, 

Nevada: Nevada Bureau of Mines and Geology Field Studies Map 5, scale 1:24,000.

John, D.A., 1997, Geologic map of the Wonder Mountain 

quadrangle, Nevada: Nevada Bureau of Mines and Geology 

Map 109, scale 1:24,000.

References Cited 13
John, D.A., and Robinson, A.C., 1989, Rb-Sr whole-rock 

isotopic ages of granitic plutons in the western part of the 

Tonopah 1° by 2° quadrangle, Nevada: Isochron/West, v. 

53, p. 20–27.

John, D.A., Schweickert, R.A., and Robinson, A.C., 1994, 

Granitic rocks in the Triassic-Jurassic magmatic arc of 

western Nevada and eastern California: U.S. Geological 

Survey Open-File Report 94–148, 61 p.

John, D.A., Wallace, A.R., Ponce, D.A., Fleck, R.B., and Conrad, J.E., 2000, New perspectives on the geology and origin 

of the northern Nevada rift in Cluer, J.K., and others, Geology and ore deposits 2000: Geological Society of Nevada, 

The Great Basin and Beyond Symposium, May 15–18, 

2000, Proceedings, p. 127–154.

Johnson, M.G., 1977, Geology and mineral deposits of Pershing County, Nevada: Nevada Bureau of Mines and Geology, Bulletin 89, 115 p.

Johnson, V.Y., and Keith, J.D., 1991, Petrology and geochemistry of the Springer scheelite skarn deposit, Mill City, 

Nevada, in Raines, G.L., Lisle, R.W., Schafer, R.W., and 

Wilkinson, W.H., eds., Geology and ore deposits of the 

Great Basin, Symposium Proceedings: Geological Society 

of Nevada, p. 553–578.

Kelson, C.R., Crowe, D.E., and Stein, H.J., 2005, Geochronology and geochemistry of the Hilltop, Lewis, and Bullion 

mining districts, Battle Mountain–Eureka trend, Nevada—

Window to the World: Geological Society of Nevada, 

Symposium 2005, Program with Abstracts, p. 59.

Ketner, K.B., 1990, Geologic map of the Elko Hills, Elko 

County, Nevada: U.S. Geological Survey Miscellaneous 

Geologic Investigations Series Map I–2082, scale 1:24,000.

Ketner, K.B., 1998, Geologic map of the southern Independence Mountains, Elko County, Nevada: U.S. Geological 

Survey Miscellaneous Geologic Investigations Series Map 

I–2629, scale, 1:24,000.

Kistler, R.W., Ghent, E.D., and O’Neil, J.R., 1981, Petrogenesis of garnet two-mica granites in the Ruby Mountains, 

Nevada: Journal of Geophysical Research, v. 86, no. B11, 

p. 10,591–10,606.

Kistler, R.W., and Lee, D.E., 1989, Rubidium, strontium, and 

strontium isotopic data for a suite of granitoid rocks from 

the Basin and Range province, Arizona, California, Nevada, 

and Utah: U.S. Geological Survey Open-File Report 

89–199, 13 p.

Kleinhampl, F.J., and Ziony, J.I., 1984, Mineral resources of 

northern Nye County, Nevada: Nevada Bureau of Mines 

and Geology Bulletin 99–B, 243 p.

Knopf, Adolph, 1924, Geology and ore deposits of the Rochester district, Nevada: U.S. Geological Survey Bulletin 762, 

78 p.

Krueger, H.W., and Schilling, J.H., 1971, Geochron/Nevada 

Bureau of Mines K-Ar age determinations—List 1: Isochron/West, no. 1, p. 9–14.

Lawson, A.C., 1906, The copper deposits of the Robinson 

mining district: Berkeley, Calif., University of California, 

Bulletin of the Department of Geology, v. 4, no. 14, p. 

287–357.

Le Bas, M.J., Le Maitre, R.W., Streckeisen, A., and Zanettin, 

B., 1986, A chemical classification of volcanic rocks using 

the total alkali-silica diagram: Journal of Petrology, v. 27, 

p. 745–750.

Lee, D.E., 1984, Analytical data for a suite of granitoid rocks 

from the Basin and Range Province: U.S. Geological Survey Bulletin 1602, 54 p.

Lee, D.E., Kistler, R.W., Friedman, I., and Van Loenen, R.E., 

1981, Two-mica granites of northeastern Nevada: Journal 

of Geophysical Research, v. 86, p. 10,607–10,616.

Lee, D.E., Kistler, R.W., and Robinson, A.C., 1986, The strontium isotope composition of granitoid rocks of the southern 

Snake Range, Nevada: U.S. Geological Survey Bulletin 

1622, chapter P, p. 171–179.

 Lee, D.E., Marvin, R.F., and Mehnert, H.H., 1980, A radiometric study of Mesozoic-Cenozoic metamorphism in 

eastern White Pine County, Nevada, and nearby Utah: U.S. 

Geological Survey Professional Paper 1158–C, p. 17–28.

Lee, D.E., Marvin, R.F., Stern, T.W., and Peterman, Z.E., 

1970, Modification of potassium-argon ages by Tertiary 

thrusting in the Snake Range, White Pine County, Nevada: 

U.S. Geological Survey Professional Paper 700–D, p. 

D92–D102.

Lee, D.E., and Van Loenen, R.E., 1971, Hybrid granitoid rocks 

of the southern Snake Range, Nevada: U.S. Geological 

Survey Professional Paper 668, 48 p.

Lee, J., Gans, P.B., and Miller, E.L., 1999, Geologic map 

of the Third Butte East quadrangle, Nevada: Nevada 

Bureau of Mines and Geology Field Studies Map 16, scale 

1:24,000.

Lee, Sang-Yun, 1999, Geology and petrology of Cretaceous 

and Tertiary granitic rocks, Lamoille Canyon, Ruby Mountains, Nevada: Lubbock, Tex., Texas Tech University Ph.D. 

thesis, 272 p.

14  Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
Lee, Sang-Yun, Barnes, C.G., Snoke, A.W., Howard, K.A., 

and Frost, C.D., 2003, Petrogenesis of Mesozoic, peraluminous granites in the Lamoille Canyon area, Ruby 

Mountains, Nevada, U.S.A.: Journal of Petrology, v. 44, p. 

713–732.

Maher, B.J., Browne, Q.J., and McKee, E.H., 1990, Chronology of Tertiary igneous and hydrothermal events, Roberts 

Mountains, Eureka County, Nevada [abs.], in Geology and 

ore deposits of the Great Basin: Geological Society of 

Nevada, Program with Abstracts, p. 48.

Maher, K.A., 1989, Geology of the Jackson Mountains, 

northwest Nevada: Pasadena, Calif., California Institute of 

Technology Ph.D. dissertation, 526 p.

Maldonado, Florian, Spengler, R.W., Hanna, W.F., and Dixon, 

G.L., 1988, Index of granitic rock masses in the State of 

Nevada: U.S. Geological Survey Bulletin 1831, 81 p.

Marvin, R.F., and Cole, J.C., 1978, Radiometric ages; Compilation A, U. S. Geological Survey: Isochron/West, no. 22, 

p. 3–14.

Marvin, R.F., and Dobson, S.W., 1979, Radiometric ages; 

Compilation B, U.S. Geological Survey: Isochron/West, no. 

26, p. 3–32.

Marvin, R.F., Mehnert, H.H., and Naeser, C.W., 1989, U.S. 

Geological Survey radiometric ages; Compilation C, Part 

3—California and Nevada: Isochron/West, v. 52, p. 3–11.

McDowell, F.W., and Kulp, J.L., 1967, Age of intrusions and 

ore deposition in the Robinson mining district of Nevada: 

Economic Geology, v. 62, p. 905–909.

McGrew, A.J., Peters, M.T., and Wright, J.E., 2000, Thermobarometric constraints on the tectonothermal evolution 

of the East Humboldt Range metamorphic core complex, 

Nevada: Geological Society of America Bulletin, v. 112, p. 

45–60.

McKee, E.H., 1968, Geologic map of the Ackerman Canyon 

quadrangle, Lander and Eureka Counties, Nevada: U.S. 

Geological Survey Geologic Quadrangle Map GQ–761, 

scale 1:62,500.

McKee, E.H., 1976a, Geology of the northern part of the 

Toquima Range, Lander, Eureka, and Nye Counties, 

Nevada: U.S. Geological Survey Professional Paper 931, 

49 p.

McKee, E.H., 1976b, Geologic map of the Austin quadrangle, 

Lander County, Nevada: U.S. Geological Survey Geologic 

Quadrangle Map GQ–1307, scale 1:62,500.

McKee, E.H., 1992, Potassium argon and 40Ar/39Ar geochronology of selected plutons in the Buckingham area, in

Theodore, T.G., Blake, D.W., Loucks, T.A., and Johnson, 

C.A., Geology of the Buckingham stockwork molybdenum 

deposit and surrounding area, Lander County, Nevada: U.S. 

Geological Survey Professional Paper 798–D, p. D36–D40.

McKee, E.H., and Silberman, M.L., 1970, Geochronology of 

Tertiary igneous rocks in central Nevada: Geological Society of America Bulletin, v. 81, p. 2317–2328.

McKee, E.H., Silberman, M.L., Marvin, R.F., and Obradovich, 

J.D., 1971, A summary of radiometric ages of Tertiary volcanic rocks in Nevada and eastern California; Part I, central 

Nevada: Isochron/West, no. 2, p. 21–42.

McKee, E.H., Tarshis, A.L., and Marvin, R.F., 1976, Summary of radiometric ages of Tertiary volcanic and selected 

plutonic rocks in Nevada, Part V—Northeastern Nevada: 

Isochron/West, no. 16, p. 15–27.

Merriam, C.W., and Anderson, C.A., 1942, Reconnaissance 

survey of the Roberts Mountains, Nevada: Geological Society of America Bulletin, v. 53, p. 1675–1728.

Miller, D.M., Hillhouse, W.C., Zartman, R.E., and Lanphere, 

M.A., 1987, Geochronology of intrusive and metamorphic 

rocks in the Pilot Range, Utah and Nevada, and comparison 

with regional patterns [Bethridge Creek and Pilot Creek 

areas]: Geological Society of America Bulletin, v. 99, p. 

866–879.

Miller, D.M., Nakata, J.K., and Glick, L.L., 1990, K-Ar ages 

of Jurassic to Tertiary plutonic and metamorphic rocks, 

northwestern Utah and northeastern Nevada: U.S. Geological Survey Bulletin 1906, 18 p.

Miller, E.L., Gans, P.B., Wright, J.E., and Sutter, J.F., 1988, 

Metamorphic history of the east-central Basin and Range 

Province; tectonic setting and relationship to magmatism, in

Ernst, W.G., ed., Metamorphic and crustal evolution of the 

western United States: Rubey Volume VII, Prentice Hall, 

Englewood Cliffs, N.J, p. 649–682.

Missallati, A.A., 1973, Geology and ore deposits of the Mount 

Hope mining district, Eureka County, Nevada: Palo Alto, 

Calif., Stanford University Ph.D. thesis, 235 p.

Moores, E.M., Scott, R.B., and Lumsden, W.W., 1968, Tertiary 

tectonics of the White Pine–Grant Range region, east-central Nevada, and some regional implications: Geological 

Society of America Bulletin, v. 79, p. 1703–1726.

Morabbi, M., 1980, The geology and ore deposits of Cherry 

Creek Pluton, White Pine County, Nevada: Boise, Idaho, 

Idaho State University M.S. thesis, 92 p.

References Cited 15
Mortensen, J.K., Thompson, J.F.H., and Tosdal, R.M., 2000, 

U-Pb age constraints on magmatism and mineralization in 

the northern Great Basin, in Cluer, J. K., and others, eds., 

Geology and ore deposits 2000: Geological Society of 

Nevada, The Great Basin and Beyond Symposium, May 

15–18, 2000, Proceedings, p. 419–438.

Morton, J.L., Silberman, M.L., Bonham, H.F., Garside, L.J., 

and Noble, D.C., 1977, K-Ar ages of volcanic rocks, plutonic rocks, and ore deposits in Nevada and eastern California: Isochron/West, no. 20, p. 19–29.

Mueller, K.J., 1992, Tertiary basin development and exhumation of the northern East Humboldt–Wood Hills metamorphic complex, Elko County, Nevada: Laramie, Wyo., 

University of Wyoming Ph.D. thesis, 312 p.

Muffler, L.J.P., 1964, Geology of the Frenchie Creek quadrangle, north-central Nevada: U.S. Geological Survey Bulletin 

1179, 99 p.

Myers, G.L., 1994, Geology of the Copper Canyon–Fortitude 

skarn system, Battle Mountain, Nevada: Pullman, Wash., 

Washington State University Ph.D. dissertation, 338 p.

Nelson, S.W., 1975, The petrology of a zoned granitic stock, 

Stillwater Range, Churchill County, Nevada: Reno, Nev., 

University of Nevada M.S. thesis, 102 p.

Nolan, T.B., Merriam, C.W., and Blake, M.C., Jr., 1974, 

Geologic map of the Pinto Summit quadrangle, Eureka and 

White Pine Counties, Nevada: U.S. Geological Survey Miscellaneous Investigations Series Map I–793, scale 1:31,680.

Nosker, S.A., 1981, Stratigraphy and structure of the Sou 

Hills, Pershing County, Nevada: Reno, Nev., University of 

Nevada M.S. thesis, 60 p.

O’Neill, J.M., 1968, Geology of the southern Pilot Range, 

Elko County, Nevada, and Box Elder and Tooele Counties, 

Utah: Albuquerque, N. Mex., University of New Mexico 

M.S. thesis, 113 p.

Phinisey, J.D., 1995, Petrography, alteration, and mineralization of igneous dikes of the Jerritt Canyon district, Elko 

County, Nevada: Reno, Nev., University of Nevada M.S. 

thesis, 173 p.

Pullman, S.A., 1983, The petrography and petrology of a 

portion of the northern Cedar Mountains, Mineral County, 

Nevada: Reno, Nev., University of Nevada M.S. thesis, 130 

p.

Pullman, S.A., 1984, K-Ar age of the Cedar Mountain pluton, 

Mineral County, Nevada: Isochron/West, no. 39, p. 17.

Putney, T.R., 1985, Geology, geochemistry, and alteration of 

the Seligman and Monte Cristo stocks, White Pine mining 

district, White Pine County, Nevada: Reno, Nev., University of Nevada M.S. thesis, 152 p.

Radtke, A.S., 1985, Geology of the Carlin gold deposit, 

Nevada: U.S. Geological Survey Professional Paper 1267, 

124 p.

Rahl, J.M., McGrew, A.J., and Foland, K.A., 2002, Transition from contraction to extension in the northeastern Basin 

and Range—New evidence from the Copper Mountains, 

Nevada: Journal of Geology, v. 110, p. 179–194.

Ressel, M.W., Jr., 2005, Igneous geology of the Carlin trend, 

Nevada—The importance of Eocene magmatism in gold 

mineralization: Reno, Nev., University of Nevada Ph.D. 

thesis, 266 p.

Ressel, M.W., and Henry, C.D., 2006, Igneous geology of the 

Carlin trend, Nevada—Development of the Eocene plutonic 

complex and significance for Carlin-type gold deposits: 

Economic Geology, v. 101, p. 347–384.

Ressel, M.W., Noble, D.C., Heizler, M.T., Volk, J.A., Lamb, 

J.B., Park, D.E., Conrad, J.E., and Mortensen, J.K., 2000, 

Gold-mineralized Eocene dikes at Griffin and Meikle, bearing on the age and origin of deposits of the Carlin Trend, 

Nevada, in Cluer, J.K., and others, eds., Geology and ore 

deposits 2000: Geological Society of Nevada, The Great 

Basin and Beyond Symposium, May 15–18, 2000, Proceedings, p. 79–101.

Roberts, R.J., 1964, Stratigraphy and structure of the Antler 

Peak quadrangle, Humboldt and Lander Counties, Nevada: 

U.S. Geological Survey Professional Paper 459–A, 93 p.

Ross, D.C., 1961, Geology and mineral deposits of Mineral 

County, Nevada: Nevada Bureau of Mines and Geology 

Bulletin 58, 98 p.

Sayeed, U.A., 1973, Petrology and structure of Kern Mountains plutonic complex, White Pine County, Nevada, and 

Juab County, Utah: Lincoln, Nebr., University of Nebraska 

Ph.D. dissertation 134 p.

Schilling, J.H., 1965, Potassium-argon ages of the granitic 

intrusive rocks: U.S. Atomic Energy Commission Report 

VUF-1001, p. 159–164.

Seymour, R.S., 1980, Petrology and geochemistry of the 

Coffeepot stock, N.E. Nevada—A record of crystallization 

history and hydrothermal fluid migrations: Eugene, Oreg., 

University of Oregon M.S. thesis, 237 p.

Shaver, S.A., and Jeanne, R.A., 1996, The geology and evolution of the weakly Au-(Cu)-mineralized far eastern side 

of the Robinson Mining District, Ely, Nevada, in Coyner, 

A.R., and Fahey, P.L., eds., Geology and ore deposits of the 

American Cordillera: Geological Society of Nevada, Symposium Proceedings, April 10–13, 1995, p. 1623–1637.

Shawe, D.R., 1961, Rhyolites in the Egan Range south of Ely, 

Nevada: U.S. Geological Survey Professional Paper 424–B, 

p. B178–B181.

16  Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
Shawe, D.R., 1995, Geologic map of the Round Mountain 

quadrangle, Nye County, Nevada: U.S. Geological Survey 

Geologic Quadrangle Map GQ–1756, scale 1:24,000.

Shawe, D.R., 1999, Geologic map of the Manhattan quadrangle, Nye County, Nevada: U.S. Geological Survey Geologic 

Quadrangle Map GQ–1775, 22 p., scale 1:24,000.

Shawe, D.R., 2003, Geochemistry, geochronology, mineralogy, and geology suggest sources of and controls on mineral 

systems in the southern Toquima Range, Nye County, 

Nevada, with geochemistry maps of Gold, silver, mercury, 

arsenic, antimony, zinc, copper, lead, molybdenum, bismuth, iron, titanium, vanadium, cobalt, beryllium, boron, 

fluorine, and sulfur by D.R. Shawe and J.D. Hoffman 

and with a section on Lead associations, mineralogy and 

paragenesis, and isotopes by D.R. Shawe, B.R. Doe, E.E. 

Foord, H.J. Stein, and R.A. Ayuso: U.S. Geological Survey 

Miscellaneous Field Studies Map MF–2327–C, 68 p.

Shawe, D.R., and Lepry, L.B., Jr., 1985, Analytical data for 

rock samples from the Round Mountain and Manhattan 

quadrangles, Nye County, Nevada: U.S. Geological Survey 

Open-File Report 85–0538, 38 p.

Shawe, D.R., Marvin, R.F., Andriessen, P.A.M., Mehnert, 

H.H., and Merritt, V.M., 1986, Ages of igneous and hydrothermal events in the Round Mountain and Manhattan gold 

districts, Nye County, Nevada: Economic Geology, v. 81, p. 

388–407.

Shawe, F.R., Reeves, R.G., and Kral, V.E., 1962, Iron ore 

deposits of Nevada—part C; Iron ore deposits of northern 

Nevada: Nevada Bureau of Mines and Geology, Bulletin 

53, p. 79–128.

Silberling, N.J., and John, D.A., 1989, Geologic map of preTertiary rocks of the Paradise Range and southern Lodi 

Hills, west-central Nevada: U.S. Geological Survey Miscellaneous Field Studies Map MF–2062, scale 1:24,000.

Silberman, M.L., Berger, B.R., and Koski, R.A., 1974, K-Ar 

age relations of granodiorite emplacement and tungsten 

and gold mineralization near the Getchell mine, Humboldt 

County, Nevada: Economic Geology, v. 69, p. 646–656.

Silberman, M.L., and McKee, E.H., 1971, K-Ar ages of granitic plutons in north-central Nevada: Isochron/West, no. 1, 

p. 15–22.

Slack, J.F., 1974, Jurassic suprastructure in the Delano 

Mountains, northeastern Elko County, Nevada: Geological 

Society of America Bulletin, v. 85, p. 269–272.

Sloan, J., Henry, C.D., Hopkins, M., Ludington, S., Zartman, 

R.E., Bush, C.A., and Abston, C., 2003, National geochronological database: U.S. Geological Survey Open-File 

Report 03–236, 6 tables.

Smith, J.F., Jr., and Ketner, K.B., 1976, Stratigraphy of postPaleozoic rocks and summary of resources in the Carlin–Pinon Range area, Nevada: U.S. Geological Survey 

Professional Paper 867–B, 48 p.

Smith, J.G., McKee, E.H., Tatlock, D.B., and Marvin, R.F., 

1971, Mesozoic granitic rocks in northwestern Nevada—A 

link between the Sierra Nevada and Idaho batholiths: Geological Society of America Bulletin, v. 82, p. 2935–2944.

Smith, M.R., 1981, Geology and mineralization of the southeastern Gillis Range, Mineral County, Nevada: Reno, Nev., 

University of Nevada M.S. thesis, 103 p.

Speed, R.C., and Armstrong, R.L., 1971, Potassium-argon 

ages of some minerals from igneous rocks of western 

Nevada: Isochron/West, no. 1, p. 1–8.

Speed, R.C., and McKee, E.H., 1976, Age and origin of the 

Darrough Felsite, southern Toiyabe Range, Nevada: U.S. 

Geological Survey Journal of Research, v. 4, p. 75–81.

Spencer, A.C., 1917, The geology and ore deposits of Ely, 

Nevada: U.S. Geological Survey Professional Paper 96, 189 

p.

Stablein, N.K., 1969, Petrogenesis of microcline megacrysts 

in the New York Canyon pluton, Stillwater Range, Nevada: 

Evanston, Ill., Northwestern University M.S. thesis, 81 p.

Starkey, K.J., 1987, Geology, petrography, chemistry and 

petrogenesis of the Nannies Peak intrusive complex, Elko 

County, Nevada: Laramie, Wyo., University of Wyoming 

M.S. thesis, scale 1:24,000.

Stewart, J.H., and Carlson, J.E., 1978, Geologic map of 

Nevada: U.S. Geological Survey, scale 1:500,000.

Stewart, J.H., and McKee, E.H., 1977, Geology and mineral 

deposits of Lander County, Nevada: Nevada Bureau of 

Mines and Geology Bulletin 88, 106 p.

Streckeisen, A.L., 1973, Plutonic rocks, classification and 

nomenclature recommended by the IUGS subcommission 

on the systematics of igneous rocks: Geotimes, v. 18, no. 

10, p. 26–30.

Strike, A.T., 2000, Deep crustal flow, Tertiary magmatism and 

mylonitization in middle crustal rocks, Liberty Pass–Wines 

Peak area, northern Ruby Mountains, Elko County Nevada: 

Laramie, Wyo., University of Wyoming M.S. thesis, 105 p.

Taylor, J.K., 1982, Geology of the Nevada Scheelite mine, 

Mineral County, Nevada: Reno, Nev., University of Nevada 

M.S. thesis, 94 p.

References Cited 17
Theodore, T.G., 2000, Geology of pluton-related gold mineralization at Battle Mountain, Nevada, with a section on Potassium-argon chronology of Cretaceous and Cenozoic igneous 

activity, hydrothermal alteration, and mineralization by E.H. 

McKee, and a section on Lone Tree gold deposit by E.I. 

Bloomstein, B.L. Braginton, R.W. Owen, R.L. Parrat, K.C. 

Raabe, and W.F. Thompson, and a section on Geology of 

the Marigold Mine area by D.H. McGibbon and A.B. Wallace, and a section on Geology, mineralization, and exploration history of the Trenton Canyon project by R.P. Felder: 

Tucson, Ariz., University of Arizona and U.S. Geological 

Survey Center for Mineral Resources, Monograph 2, 271 p.

Theodore, T.G., Blake, D.W., Loucks, T.A., and Johnson, 

C.A., 1992, Geology of the Buckingham stockwork 

molybdenum deposit and surrounding area, Lander County, 

Nevada: U.S. Geological Survey Professional Paper 798–D, 

p. D1–D307.

Theodore, T.G., Silberman, M.L., and Blake, D.W., 1973, 

Geochemistry and K-Ar ages of plutonic rocks in the Battle 

Mountain mining district, Lander County, Nevada: U.S. 

Geological Survey Professional Paper 798–A, 24 p.

Thole, R.H., and Prihar, D.W., 1998, Geologic map of the 

Eugene Mountains, northwestern Nevada: Nevada Bureau 

of Mines and Geology Map 115, scale, 1:24,000, 12 p.

Thurber, J.E., 1982, Petrology and Cu-Mo mineralization of 

the Kennedy stock, East Range, Pershing County, Nevada: 

Fort Collins, Colo., Colorado State University M.S. thesis, 

101 p.

Tingley, J.V., 1975, K-Ar dates on granodiorites and related 

scheelite-bearing quartz veins at Tungsten, Pershing County, 

Nevada: Isochron/West, no. 12, p. 3–4.

Vikre, P.G., 1985, Precious metal vein systems in the National 

district, Humboldt County, Nevada: Economic Geology, v. 

80, p. 360–393.

Wells, J.D., Elliott, J.E., and Obradovich, J.D., 1971, Age of 

the igneous rocks associated with ore deposits, Cortez–

Buckhorn area, Nevada: U.S. Geological Survey Professional Paper 750–C, p. C127–C135.

Westra, G., and Riedell, K.B., 1996, Geology of the Mt. Hope 

stockwork molybdenum deposit, Eureka County, Nevada, 

in Coyner, A.R., and Fahey, P.L., eds., Geology and ore 

deposits of the American Cordillera: Geological Society 

of Nevada Symposium Proceedings, April 10–13, 1995, p. 

1639–1666.

Whitebread, D.H., 1994, Geologic map of the Dun Glen quadrangle, Pershing County, Nevada: U.S. Geological Survey 

Miscellaneous Investigations Series Map I–2409, scale 

1:48,000.

Willden, R., 1964, Geology and mineral deposits of Humboldt 

County, Nevada: Nevada Bureau of Mines and Geology 

Bulletin 59, 154 p.

Willden, R., and Speed, R.C., 1974, Geology and mineral 

deposits of Churchill County, Nevada: Nevada Bureau of 

Mines and Geology Bulletin 83, 95 p.

Wooden, J.L., Kistler, R.W., and Tosdal, R.M., 1999, Strontium, lead, and oxygen isotopic data for granitoid and volcanic rocks from the northern Great Basin and Sierra Nevada, 

California, Nevada and Utah: U.S. Geological Survey 

Open-File Report 99–569, 20 p.

Wrucke, C.T., and Armbrustmacher, T.J., 1973, Geochemical 

analyses of bedrock samples collected in the Gold Acres 

and Tenabo areas, northern Shoshone Range, Nevada: 

National Technical Information Service PB220645, 136 p.

Wrucke, C.T., and Silberman, M.L., 1975, Cauldron subsidence of Oligocene age at Mount Lewis, northern Shoshone 

Range, Nevada: U.S. Geological Survey Professional Paper 

876, 20 p.

Manuscript approved for publication January 31, 2007

Published in the Central Region, Denver, Colorado

Graphics by authors

Covers by Sharon M. Powers

Photocomposition and editing by Alessandro J. Donatich

18  Geochemical Database for Intrusive Rocks of North-Central and Northeast Nevada
Figure 2 (above and following pages). Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock histogram bar indicates number of samples whose abundances of indicated component are as much as numeric label beneath bar but greater than vlower abundance bar (for instance, if two adjacent bars are labeled 90 and 100 and if associated data are reported as whole numbers, the height bar number of samples with abundances of 91 to 100). Also presented are basic descriptive statistics, including mean and standard deviation, median, mcount, for each distribution. A, SiO2; B, TiO2; C, Al2O3; D, FeO*; E, MnO; F, MgO; G, CaO; H, Na2O; I, K2O; J, P2O5; K, H2O+; L, H2O-; M, CO2; N, Cl; O, F; P, S; 

total volatile content; S, Ba; T, La; U, Ce; V, Rb; W, Sr; X, Y; Y, Zr; Z, Nb; AA, Th; BB, Ga; CC, Co; DD, Cr; EE, Ni; FF, Sc; GG, V; HH, Ag; II, Cu; JJ, Mo; KK, P

A

0

50

100150200250300350400

40 44 48 52 56 60 64 68 72 76 80 84 

SiO2, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

B

0

100200300400500600700800

0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 

TiO2, IN WEIGHT PERCENT 

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

C

0

100200300400500600700

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 

Al2O3, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

D

0

100200300400500600700

0 1 2 3 4 5 6 7 8 9 10 11 12 13 

FeO*, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

E

0

100200300400500600700

0.000 0.050 0.100 0.150 0.200 0.250 0.300 0.350 0.400 0.4

MnO, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

F

0

200400600800

10001200

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 1

MgO, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

G

0

100200300400500600700800

0 1 2 3 4 5 6 7 8 9 10 11 12 13 

CaO, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

H

0

100200300400500600700800

0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 

Na2O, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

I

0

100200300400500600

0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9

K2O, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

J

0

50

100150200250300350400450

0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 0.85 

P2O5, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

K

0

50

100150200250

0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 4.50 5.00 

H2O+, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

L

0

50

100150200250300350

0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.8

H2O-, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

M

0

50

100150200250300350400

0.00 0.20 0.40 0.60 0.80 1.00 1.20 1.40 1.60 1.8

CO2, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

N

0

102030405060708090

100

0.000 0.010 0.020 0.030 0.040 0.050 0.060 0.070 0.080 0.090 

Cl, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

O

0

20406080

100120140160

0.00 0.04 0.08 0.12 0.16 0.20 0.24 0.28 0.32 0.36 0.40 0.44 

F, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

P

0

50

100150200250300

0.00 0.02 0.04 0.06 0.08 0.10 0.12 0.14 0.16 0.18 0.20 0.22 0.24 0.26 

S, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

Q

0

200400600800

1000120014001600

85 87 89 91 93 95 97 99 101 103 105 

INITIAL ANALYTICAL TOTAL, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

R

0

100200300400500600700800900

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 

TOTAL VOLATILE CONTENT, IN WEIGHT PERCENT

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

S

0

20406080

100120140160180200

0 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 

Ba, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

T

0

50

100150200250

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 18

La, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

U

0

20406080

100120140160

0 20 40 60 80 100 120 140 160 180 200 22

Ce, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

V

0

50

100150200250300

0 40 80 120 160 200 240 280 320 360 400 440 

Rb, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

W

0

50

100150200250

0 100 200 300 400 500 600 700 800 900 1000 1100 1200 1300 

Sr, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

X

0

50

100150200250300350400

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 9

Y, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

Y

0

20406080

100120140160180200

0 40 80 120 160 200 240 280 320 360 400 440 

Zr, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

Z

0

50

100150200250300350400

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 9

Nb, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

AA

0

50

100150200250300350

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 9

Th, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

BB

0

50

100150200250300350400450

0 5 10 15 20 25 30 35 40 45 

Ga, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

CC

0

50

100150200250300350400450500

0 5 10 15 20 25 30 35 40 45 50 55 

Co, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

DD

0

50

100150200250300350400450500

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 36

Cr, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

EE

0

50

100150200250300350400450

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 18

Ni, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

FF

0

100200300400500600

0 5 10 15 20 25 30 35 40 45 

Sc, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

GG

0

50

100150200250300350

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 3

V, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

HH

0

20406080

100120140

0.0 0.4 0.8 1.2 1.6 2.0 2.4 2.8 3.2 3.6 4.0 4.4 4.8 5.2 

Ag, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

II

0

100200300400500600

0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 160 170 18

Cu, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

JJ

0

20406080

100120140160180

0 2 4 6 8 10 12 14 16 18 20 22 24 26 

Mo, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

KK

0

50

100150200250

0 10 20 30 40 50 60 70 80 90 100 110 120 130 

Pb, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

LL

0

50

100150200250

0 20 40 60 80 100 120 140 160 180 200 220 240 260 

Zn, IN PARTS PER MILLION

FREQUENCY
Figure 2. Frequency distribution histograms showing compositions of north-central and northeast Nevada intrusive rock samples—Continued.

MM

0

102030405060708090

100

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.0

Au, IN PARTS PER MILLION

FREQUENCY
Table 1. Number of observations (Freq) within each composition range (Bin) for north-central and northeast Nevada intrusion database.

[Each bin denotes an abundance less than or equal to the indicated value but greater than that specified by the bin with the next lowest abundance. Bins for SiO2, TiO2, Al2O3, FeK2O, P2O5, H2O+, H2O-, CO2, Cl, F, S, initial analytical total (total_I), and total volatile content (vol_sum) are in weight percent; all others in parts per million]

SiO2 TiO2 Al2O3 FeO* MnO MgO CaO Na2O 

Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq 

40 1 0.0 21 6 8 0 4 0.000 78 0.0 8 0 5 0.0 242 2 0.2 682 7 3 1 487 0.025 405 0.5 1001 1 667 0.5 2244 5 0.4 647 8 6 2 579 0.050 550 1.0 426 2 476 1.0 646 11 0.6 699 9 8 3 575 0.075 644 1.5 354 3 433 1.5 648 10 0.8 340 10 15 4 453 0.100 353 2.0 329 4 423 2.0 850 29 1.0 168 11 29 5 226 0.125 199 2.5 202 5 296 2.5 1352 32 1.2 94 12 38 6 197 0.150 95 3.0 137 6 185 3.0 3254 40 1.4 54 13 142 7 113 0.175 52 3.5 72 7 98 3.5 7056 60 1.6 27 14 367 8 65 0.200 31 4.0 47 8 53 4.0 6758 58 1.8 18 15 621 9 40 0.225 19 4.5 49 9 38 4.5 2860 68 2.0 14 16 663 10 24 0.250 11 5.0 29 10 36 5.0 1662 103 2.2 6 17 488 11 23 0.275 7 5.5 27 11 23 5.5 364 132 2.4 14 18 273 12 20 0.300 4 6.0 23 12 10 6.0 166 216 2.6 6 19 71 13 8 0.325 5 6.5 17 13 15 6.5 68 300 2.8 0 20 34 14 6 0.350 3 7.0 16 14 12 7.0 170 293 3.0 0 21 18 15 3 0.375 0 7.5 11 15 4 7.5 72 339 >3.0 11 22 6 >15 16 0.400 3 8.0 11 >15 30 8.0 74 328 23 20 0.425 2 8.5 4 >8.0 76 366 24 7 0.450 1 9.0 4 78 274 25 6 0.475 0 9.5 6 80 83 >25 17 0.500 1 10.0 6 82 59 >0.500 6 10.5 4 84 11 11.0 386 12 >11.0 2188 390 3

>90 2
Table 1. Number of observations (Freq) within each composition range (Bin) for north-central and northeast Nevada intrusion database—Continued.

P2O5 H2O+ H2O- CO2 Cl F S total_I 

Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Fr

0.00 62 0.00 0 0.00 2 0.00 9 0.000 58 0.00 0 0.00 18 85 0.05 317 0.25 41 0.10 255 0.10 369 0.010 88 0.02 52 0.01 264 86 0.10 428 0.50 173 0.20 287 0.20 89 0.020 53 0.04 126 0.02 37 87 0.15 428 0.75 233 0.30 96 0.30 47 0.030 34 0.06 142 0.03 9 88 0.20 388 1.00 169 0.40 57 0.40 34 0.040 9 0.08 140 0.04 15 89 0.25 328 1.25 72 0.50 29 0.50 24 0.050 8 0.10 68 0.05 6 90 0.30 199 1.50 60 0.60 32 0.60 16 0.060 2 0.12 37 0.06 6 91 0.35 140 1.75 27 0.70 15 0.70 13 0.070 1 0.14 31 0.07 7 92 0.40 72 2.00 30 0.80 13 0.80 11 0.080 1 0.16 18 0.08 7 93 0.45 34 2.25 18 0.90 15 0.90 8 0.090 0 0.18 12 0.09 5 94 0.50 36 2.50 20 1.00 11 1.00 11 0.100 0 0.20 10 0.10 3 95 0.55 26 2.75 11 1.10 9 1.10 1 >0.100 9 0.22 5 0.11 2 96 0.60 14 3.00 10 1.20 4 1.20 9 0.24 5 0.12 2 97 0.65 13 3.25 8 1.30 4 1.30 1 0.26 4 0.13 4 98 0.70 10 3.50 7 1.40 5 1.40 0 0.28 3 0.14 2 99 40.75 12 3.75 9 1.50 3 1.50 0 0.30 0 0.15 3 100 130.80 4 4.00 3 1.60 5 1.60 2 0.32 2 0.16 1 101 50.85 5 4.25 7 1.70 1 1.70 5 0.34 0 0.17 6 102 0.90 5 4.50 2 1.80 3 1.80 5 0.36 4 0.18 2 103 0.95 1 4.75 2 1.90 2 1.90 1 0.38 1 0.19 2 104 

>0.95 17 5.00 4 2.00 1 2.00 3 0.40 1 0.20 1 105 

5.25 2 >2.00 8 >2.00 40 0.42 0 0.21 2 106 5.50 3 0.44 3 0.22 1 107 5.75 0 0.46 1 0.23 1 108 6.00 1 0.48 0 0.24 1 >108 

>6.00 3 0.50 1 0.25 0

>0.50 14 0.26 2

0.27 10.28 00.29 10.30 0

>0.30 77
Table 1. Number of observations (Freq) within each composition range (Bin) for north-central and northeast Nevada intrusion database—Continued.

Ba La Ce Rb Sr Y Zr Nb 

Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq 

0 5 0 0 0 3 0 1 0 16 0 0 0 0 0 

100 146 10 85 10 33 20 68 50 208 5 132 20 87 5 5

200 98 20 153 20 49 40 73 100 138 10 179 40 166 10 30

300 90 30 215 30 69 60 116 150 118 15 333 60 130 15 36

400 65 40 197 40 98 80 181 200 77 20 366 80 110 20 28

500 55 50 185 50 121 100 252 250 93 25 229 100 116 25 17

600 66 60 114 60 131 120 211 300 101 30 131 120 164 30 8

700 66 70 59 70 137 140 209 350 104 35 80 140 163 35 6

800 105 80 49 80 115 160 162 400 108 40 41 160 174 40 4

900 108 90 24 90 96 180 125 450 115 45 22 180 118 45 3

1000 129 100 17 100 60 200 93 500 111 50 20 200 118 50 2

1100 190 110 6 110 63 220 55 550 124 55 16 220 85 55 1

1200 175 120 3 120 42 240 58 600 108 60 13 240 68 60 

1300 120 130 2 130 20 260 45 650 108 65 3 260 39 65 

1400 77 140 3 140 25 280 31 700 86 70 3 280 31 70 

1500 98 150 1 150 25 300 29 750 52 75 4 300 12 75 

1600 55 160 1 160 11 320 15 800 51 80 4 320 16 80 

1700 46 170 1 170 14 340 11 850 38 85 2 340 11 85 

1800 30 180 2 180 2 360 13 900 18 90 0 360 8 90 

1900 23 190 2 190 2 380 8 950 18 95 1 380 4 95 

2000 24 200 0 200 7 400 7 1000 8 100 2 400 12 100 

2100 16 >200 2 210 4 420 7 1050 9 >100 13 420 3 >100 

2200 15 220 2 440 2 1100 3 440 2

2300 10 230 0 460 4 1150 5 460 3

2400 7 240 1 480 3 1200 10 480 6

2500 5 250 0 500 0 1250 5 500 1

2600 5 >250 14 >500 9 1300 8 >500 7

2700 5 1350 5

2800 5 1400 4

2900 5 1450 1

3000 2 1500 0

>3000 39 >1500 5
Table 1. Number of observations (Freq) within each composition range (Bin) for north-central and northeast Nevada intrusion database—Continued.

Ga Co Cr Ni Sc V Ag Cu 

Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq Bin Freq 

0 0 0 10 0 51 0 5 0 2 0 35 0.0 1 0 55 8 5 444 20 461 10 423 5 519 20 327 0.2 130 10 56

10 52 10 261 40 189 20 162 10 348 40 199 0.4 37 20 1815 94 15 106 60 118 30 113 15 109 60 204 0.6 19 30 720 413 20 38 80 87 40 53 20 46 80 173 0.8 7 40 725 189 25 30 100 48 50 21 25 27 100 120 1.0 27 50 430 49 30 33 120 35 60 11 30 13 120 48 1.2 7 60 435 10 35 18 140 32 70 7 35 18 140 36 1.4 4 70 240 1 40 9 160 30 80 15 40 5 160 35 1.6 8 80 145 0 45 11 180 18 90 5 45 3 180 17 1.8 3 90 150 1 50 6 200 26 100 7 50 1 200 17 2.0 8 100 1

>50 0 55 4 220 29 110 5 >50 2 220 9 2.2 6 110 1

60 0 240 11 120 4 240 8 2.4 6 120 

>60 3 260 7 130 8 260 10 2.6 3 130 

280 12 140 5 280 3 2.8 4 140 300 6 150 6 300 0 3.0 4 150 320 9 160 2 320 2 3.2 2 160 340 6 170 4 340 5 3.4 0 170 360 7 180 0 360 2 3.6 0 180 380 10 190 2 380 1 3.8 2 190 400 4 200 3 400 1 4.0 4 200 

>400 39 >200 14 >400 5 4.2 2 >200 8

4.4 34.6 04.8 05.0 65.2 25.4 05.6 15.8 06.0 0

>6.0 19
Pb Zn Au

Bin Freq Bin Freq Bin Freq

0 0 0 26 0.00 25 46 10 51 0.50 88

10 120 20 116 1.00 1115 183 30 147 1.50 120 199 40 185 2.00 625 128 50 201 2.50 130 74 60 207 3.00 935 52 70 139 3.50 140 29 80 121 4.00 645 22 90 58 4.50 150 14 100 58 5.00 1455 7 110 28 5.50 060 5 120 15 6.00 565 3 130 16 6.50 170 3 140 11 7.00 375 1 150 7 7.50 180 5 160 4 8.00 485 1 170 11 8.50 090 1 180 9 9.00 295 1 190 2 9.50 0

100 3 200 1 10.00 0105 0 210 2 >10.00 14110 6 220 1115 0 230 0120 1 240 1125 0 250 2130 3 260 0135 0 270 2140 2 280 0145 0 290 0150 3 300 1

>150 16 >300 23

Table 1. Number of observations (Freq) within each composition range (Bin) for north-central and northeast Nevada intrusion database—Continued.