. Tuolumne Meadows Quadrangle, 

California-Analytic Data 

U.S. GEOLOGICAL SURVEY BULLETIN 1819 
AVAILABILITY OF BOOKS AND MAPS OF THE U.S. GEOLOGICAL SURVEY 

Instructions on ordering publications of the U.S. Geological Survey, along with prices of the last offerings, are given in the current-year issues of the monthly catalog "New Publications of the U.S. Geological Survey." Prices of available U.S. Geological Survey publications released prior to the current year are listed in the most recent annual "Price and Availability List." Publications 

that are listed in various U.S. Geological Survey catalogs (see back inside cover) but not listed in the most recent annual "Price and 

Availability List" are no longer available. 

Prices of reports released to the open files are given in the listing "U.S. Geological Survey Open-File Reports," updated monthly, which is for sale in microfiche from the U.S. Geological Survey, Books and Open-File Reports Section, Federal Center, Box 

25425, Denver, CO 80225. Reports released through the NTIS may be obtained by writing to the National Technical Information 

Service, U.S. Department of Commerce, Springfield, VA 22161; please include NTIS report number with inquiry. 

Order U.S. Geological Survey publications by mail or over the counter from the offices given below. 

BY MAIL 

Books 

Professional Papers, Bulletins, Water-Supply Papers, Techniques 

of Water-Resources Investigations, Circulars, publications of general interest (such as leaflets, pamphlets, booklets), single copies of Earthquakes 

& Volcanoes, Preliminary Determination of Epicenters, and some miscellaneous reports, including some of the foregoing series that have gone 

out of print at the Superintendent of Documents, are obtainable by mail 

from 

U.S. Geological Survey, Books and Open-File Reports 

Federal Center, Box 25425 

Denver, CO 80225 

Subscriptions to periodicals (Earthquakes & Volcanoes and 

Preliminary Detennination of Epicenters) can be obtained ONLY from 

the 

Superintendent of Documents 

Government Printing Office 

Washington, D.C. 20402 

(Check or money order must be payable to Superintendent of Documents.) 

Maps 

For maps, address mail orders to 

U.S. Geological Survey, Map Distribution 

Federal Center, Box 25286 

Denver, CO 80225 

Residents of Alaska may order maps from 

Alaska Distribution Section, U.S. Geological Survey, 

New Federal Building - Box 12 

101 Twelfth Ave., Fairbanks, AK 99701 

OVER THE COUNTER 

Books 

Books of the U.S. Geological Survey are available over the 

counter at the following Geological Survey Public Inquiries Offices, all 

of which are authorized agents of the Superintendent of Documents: 

• WASHINGTON, D.C.--Main Interior Bldg., 2600 corridor, 

18th and C Sts., NW. 

• DENVER, Colorado--Federal Bldg., Rm. 169, 1961 Stout St. 

• LOS ANGELES, California--Federal Bldg., Rm. 7638, 300 N. 

Los Angeles St. 

• MENLO PARK, California--Bldg. 3 (Stop 533), Rm. 3128, 

345 Middlefield Rd. 

• RESTON, Vlrglnla--503 National Center, Rm. 1C402, 12201 

Sunrise Valley Dr. 

• SALT LAKE CITY, Utah--Federal Bldg., Rm. 8105, 125 

South State St. 

• SAN FRANCISCO, California--Customhouse, Rm. 504, 555 

Battery St. 

• SPOKANE, Washington--U.S. Courthouse, Rm. 678, West 

920 Riverside Ave .. 

• ANCHORAGE, Alaska--Rm. 101, 4230 University Dr. 

• ANCHORAGE, Alaska--Federal Bldg, Rm. E-146, 701 C St. 

Maps 

Maps may be purchased over the counter at the U.S. Geological Survey offices where books are sold (all addresses in above list) and 

at the following Geological Survey offices: 

• ROLLA, Missourl--1400 Independence Rd. 

• DENVER, Colorado--Map Distribution, Bldg. 810, Federal 

Center 

• FAIRBANKS, Alaska--New Federal Bldg., 101 Twelfth Ave. 
Tuolumne Meadows Quadrangle, 

California-Analytic Data 

By PAUL C. BATEMAN, BRUCE W. CHAPPELL, 

RONALD W. KISTLER, DALLAS L. PECK, and ALAN BUSACCA 

Modal, chemical, and isotopic data 

for the granitic rocks of the 

Tuolumne Meadows quadrangle 

U.S. GEOLOGICAL SURVEY BULLETIN 1819 
DEPARTMENT OF THE INTERIOR 

DONALD PAUL HODEL, Secretary 

U.S. GEOLOGICAL SURVEY 

Dallas L. Peck, Director 

Any use of trade names and trademarks 

in this publication is for descriptive 

purposes only and does not constitute 

endorsement by the U.S. Geological Survey 

Catalog Card No. 88-600563 

UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1988 

For sale by the 

Books and Open-File Reports Section 

U.S. Geological Survey 

Federal Center, Box 25425 

Denver, CO 80225 
CONTENTS 

Abstract 1 

Introduction 1 

Geologic summary 1 

Sampling and analytic methods 2 

Modal data and specific gravity 3 

Major elements 3 

CIPWnorms 3 

Trace elements 3 

Plagioclase compositions 4 

Strontium isotopes 4 

Joints 4 

References cited 4 

FIGURES 

1. Index map showing locations of Tuolumne Meadows IS-minute quadrangle and of 

contiguous IS-minute quadrangles 6 

2-9. Generalized geologic maps of Tuolumne Meadows quadrangle showing: 

2. Locations of chemically and modally analyzed samples 6 

3. Volume-percent quartz 8 

4. Volume-percent alkali feldspar 9 

S. Volume-percent plagioclase 10 

6. Volume-percent biotite 11 

7. Volume-percent hornblende 12 

8. Volume-percent mafic and accessory minerals (color index) 13 

9. Bulk specific gravity 14 

IO. Variations of modes and specific gravities along traverse A-B 15 

Il. Variations of major oxides along traverse A-B 16 

I2. Variations of trace elements along traverse A-B 18 

I3. Variations of plagioclase compositions along traverses A-Band C-D 21 

I4. Variations of initial 87 Sr/'6

Sr along traverses A-B and C-D 22 

IS. Modal plots on Q-A-P diagrams of Tuolumne Intrusive Suite granitoids 23 

I6. Modal plots on Q-A-P diagrams of granitoids predating the Tuolumne Intrusive 

Suite 24 

I7. Color indexes of granitoids 25 

I8. Normative plots of Tuolumne Intrusive Suite granitoids 26 

I9. Generalized geologic map of Tuolumne Meadows quadrangle showing joints visible on 

aerial photographs 27 

TABLES 

I. Chemical analyses of major and trace elements and CIPW norms of samples along traverse 

A-B across the Tuolumne Intrusive Suite 28 

2. Chemical analyses of major and trace elements and CIPW norms of samples along traverse 

C-D across part of the western flank of the Tuolumne Intrusive Suite 31 

3. Chemical analyses of major and trace elements and CIPW norms of miscellaneous samples 

from theTuolumne Intrusive Suite not along traverses A-Band C-D 33 

4. Mode, color index, and specific gravity of plutonic rocks along traverse A-B across the 

Tuolumne Intrusive Suite 34 

Ill 
5. Mode, color index, and specific gravity of plutonic rocks along traverse C-D across part of 

the western flank of the Tuolumne Intrusive Suite 35 

6. Mode, color index, and specific gravity of plutonic rocks of the Tuolumne Intrusive Suite 

not along traverses A-B or C-D 36 

7. Mode, color index, and specific gravity of plutonic rock samples predating the Tuolumne 

Intrusive Suite 40 

8. Isotopic data for oxygen, rubidium, and strontium from samples along traverse A-B across 

the Tuolumne Intrusive Suite 42 

9. Isotopic data for oxygen, rubidium, and strontium from samples along traverse C-D across 

part of the western flank of the Tuolumne Intrusive Suite 43 

IV 
Tuolumne Meadows Quadrangle, CaliforniaAnalytic D.ata 

By Paul C. Bateman, Bruce W. Chappell, Ronald W. Kistler, Dallas L. Peck, and Alan Busacca 

Abstract 

This report presents modal, chemical, and isotopic data for 

the intrusive rocks of the Tuolumne Meadows quadrangle in 

the high central Sierra Nevada, California, and supplements 

the previously published geologic map of the quadrangle. 

Most of the quadrangle is underlain by plutonic rocks of the 

compositionally and texturally zoned early Late Cretaceous 

Tuolumne Intrusive Suite. The data show that both compositions and initial 87Srf6

sr change systematically inward from 

the margins of the Tuolumne Intrusive Suite as the rocks become more felsic. The greatest changes are within 1 to 2 km 

of the margins. Metamorphic rocks and late Early Cretaceous 

plutonic rocks border the Tuolumne Intrusive Suite in the 

northwestern, northeastern, and southeastern parts of the quadrangle. 

INTRODUCTION 

The Tuolumne Meadows quadrangle (fig. 1) is in the 

glaciated high Sierra Nevada, largely in the northeastern part 

of Yosemite National Park, but a small area of about 30 

km2 in the northeast comer lies east of the Sierran crest in 

the Inyo National Forest. The Tioga Road (California State 

Highway 120), a main thoroughfare across the Sierra 

Nevada, crosses the quadrangle, and numerous trails lead 

from the Tioga Road into the back country. 

This report is designed to supplement the geologic map 

of the Tuolumne Meadows quadrangle (Bateman and others, 

1983) by bringing together the analytic data currently available on the rocks of the quadrangle. The Tuolumne Intrusive 

Suite, which occupies most of the quadrangle, is of special 

interest because it is an excellent example of a typical intrusive suite (as cited in the North American stratigraphic 

code, North American Commission on Stratigraphic 

Nomenclature, 1983), and because easy access, excellent exposures, clearly established units, and relatively abundant 

high-grade analytic data already available make the suite an 

attractive subject for further study. 

Much of the chemical data on the Tuolumne Intrusive 

Suite included herein have been published in an earlier 

report by Bateman and Chappell (1979), and all of the available isotopic data were previously published by Kistler and 

others (1986). However, some chemical data and most of 

the modal data in this report have not been published previously. Not included here are rare-earth element data 

published by Frey and others (1978) and U-Pb ages of zircon from rocks of the Tuolumne Intrusive Suite published 

by Stern and others (1981). However, a map showing the 

distribution of joints within the quadrangle is included. 

The data are presented in tables and in diagrams that relate the locations of samples to the mapped geologic units. 

The accompanying text contains brief descriptions of the 

rocks and other geologic features of the quadrangle. Models 

for the origin of the zonation in the Tuolumne Intrusive 

Suite have been published by Frey and others (1978), 

Bateman and Chappell (1979), Reid and others (1983), and 

Kistler and others (1986). 

GEOLOGIC SUMMARY 

The Late Cretaceous Tuolumne Intrusive Suite, a nested 

suite of plutonic rocks, occupies most of the Tuolumne 

Meadows quadrangle (fig. 2). Somewhat older, mostly late 

Early Cretaceous, granitic rocks flank the Tuolumne Intrusive Suite in the northwestern and southern parts of the 

quadrangle, and metamorphosed sedimentary and volcanic 

rocks bound it in the northeastern part. Metasedimentary 

septa are present locally along contacts between the 

Tuolumne Intrusive Suite and the older granitoids in the 

northwestern and southeastern parts. 

The Tuolumne Intrusive Suite comprises several concentrically arranged units that are progressively younger and 

more felsic inward. Within the Tuolumne Meadows quadrangle, the tonalite of Glen Aulin is the outermost unit on 

the west, and the granodiorite of Kuna Crest is the outermost unit on the east. Successively inward from these rocks 

are the equigranular facies of the Half Dome Granodiorite, 

the megacrystic facies of the Half Dome Granodiorite, the 

Cathedral Peak Granodiorite, and the Johnson Granite Porphyry. Generally, contacts between units are sharp and intrusive, but the equigranular facies of the Half Dome 

Granodiorite grades to the megacrystic facies in most places. 

The rocks of the Tuolumne Intrusive Suite intruded all 

of the rocks with which they are in contact and are among 

the youngest granitic rocks in the central Sierra 
Nevada. U-Pb isotopic ages range from 86 to 91 m.y. (million years) (Stem and others, 1981). Compositional and 

textural changes within the suite have been described in 

detail by Bateman and Chappell (1979), and only a few pertinent relations are summarized here. In general, the marginal rocks are fine grained and dark colored, and the rocks 

become coarser grained and lighter colored inward within 

the suite. However, the Johnson Granite Porphyry in the 

core of the suite is fine grained. Exceptions to the general 

inward increase of grain size are inward decreases in the 

sizes of biotite and hornblende crystals within the megacrystic facies of the Half Dome Granodiorite and the Cathedral 

Peak Granodiorite and of alkali-feldspar megacrysts within 

the Cathedral Peak Granodiorite. 

Compositional and textural changes are greatest in the 

outer part of the intrusive suite, within 1 to 2 km of the 

outer contact. Changes take place both within units and at 

contacts between units. Each of the units represents a magmatic surge. Where a surge has removed little of the adjacent older unit, changes are very nearly gradational across 

the contact, but where the magmatic surge was transgressive and removed a significant part of an earlier unit, abrupt 

compositional and textural changes can occur at the contact. 

Traverses A-B and C-D (fig. 2) are located where little 

material was removed at contacts. Along these traverses, 

textural and compositional changes are almost entirely 

within units; abrupt compositional and textural changes 

occur only at the contact of the Johnson Granite Porphyry 

with the Cathedral Peak Granodiorite, which is sharp 

everywhere. 

The plutonic rocks that predate the Tuolumne Intrusive 

Suite in the northwestern part of the quadrangle are mostly biotite granites (table 7; fig. 16). Kistler and others 

(1986) interpreted the Yosemite Creek Granodiorite of Rose 

(1957) to be an early member of the Tuolumne Intrusive 

Suite. Compositional and textural similarities and Rb-Sr 

whole-rock dating (R.W. Kistler, unpub. data) indicate that 

the granodiorite of Double Rock and the granodiorite of 

Mount Hoffman are correlative with the El Capitan Granite, 

and that the leucogranite of Ten Lakes is correlative with 

the Taft Granite. All of these units crop out to the west 

and southwest in the Retch Hetchy Reservoir and Yosemite 

quadrangles (fig. 1). TheEl Capitan Granite and the Taft 

Granite are cogenetic and have isotopic ages of about 102 

m.y. (Stem and others, 1981). 

In the southeast comer of the quadrangle, the granites of 

Turner Lake and Ireland Lake and the leucogranite of Gallison Lake are small bodies of felsic rocks, whereas the 

more extensive granodiorite of Red Devil Lake contains 5 

to 10 percent mafic minerals (table 7; fig. 17). The granites 

of Ireland Lake and Turner Lake and the granodiorite of 

Red Devil Lake are intruded by units of the Tuolumne Intrusive Suite. The granodiorite of Red Devil Lake, which 

has a U-Pb age of98 m.y. (Stem and others, 1981), intruded 

2 

the granite of Gallison Lake and was intruded by the granite 

of Turner Lake. 

A small mass of dark-colored quartz diorite lies along 

the western edge of the Tuolumne Intrusive Suite in the 

northwest quadrant, and two masses intrude metamorphic 

rocks in the southeast quadrant. In addition to these masses 

of quartz diorite, two masses of metagranite intrude 

metamorphic rocks in the northeast quadrant. The 

metagranite masses are probably hypabyssal equivalents of 

nearby metavolcanic rocks. 

SAMPLING AND ANALYTIC METHODS 

About 350 samples of representative, unaltered, plutonic 

rocks were collected from within the quadrangle (fig. 2). 

All of the samples were analyzed modally and their specific 

gravities determined (tables 4 to 7), 64 samples were analyzed chemically (tables 1 to 3), 52 samples were analyzed 

isotopically (tables 8 and 9), and the compositions of 

plagioclase in 45 samples were determined with a microprobe. 

Sizes of samples were largest and modal determinations 

were carried out with the greatest care on the samples (underlined on figure 2) projected on traverses A-B and C-D 

(fig. 2). Samples projected on these traverses range in size 

from about 5 kg for the Johnson Granite Porphyry to 20 kg 

for the coarse-grained Cathedral Peak Granodiorite. Modes 

were determined by counting at least 2,000 equally spaced 

points on each of two slabs on which plagioclase was selectively stained red and alkali feldspar yellow. The areas of 

the slabs, except those of the fine-grained Johnson Granite 

Porphyry, exceed 150 cm

2

• Amounts of biotite, hornblende, 

and accessory minerals, which cannot be distinguished on 

stained slabs, were determined from thin sections (at least 

two for each sample) and apportioned to the total mafic 

mineral content measured on slabs (tables 4 and 5). The 

percentages of alkali-feldspar megacrysts in the Cathedral 

Peak Granodiorite were determined on the adjacent outcrops 

for all samples projected on traverses A-B and C-D and 

about half of the other samples by counting 2,000 points 

spaced 2.54 em (1 inch) apart on a square grid on a transparent overlay sheet. 

Modal analyses of the samples not projected on traverses 

A-B and C-D were carried out in a similar way but with 

fewer counts on smaller slabs, and the proportions of biotite, 

hornblende, and accessory minerals generally were determined on single thin sections. For these samples, at least 

1,000 regularly spaced points were counted on slabs having 

areas of 70 cm

2 

or more to determine the volume percent 

of quartz, alkali feldspar, plagioclase, and total mafic 

minerals (color index) (tables 6 and 7). 

Chemical analyses of the samples along traverses A-B 

and C-D and four other samples were determined at the 

Australian National University, chiefly by X-ray spectrom-
etry under the direction of B.W. Chappell (tables 1 and 2). 

Eight samples from the Tuolumne Intrusive Suite were 

analyzed in the laboratories of the U.S. Geological Survey 

by X-ray spectrometry or the rapid rock method. No 

samples of pre-Tuolumne intrusive rocks were analyzed 

chemically. Plagioclase compositions of most samples 

projected on traverses A-B and C-D were determined with 

an electron microprobe by making 20 to 40 measurements 

on each sample to determine the range of zoning (fig. 13). 

Rb-Sr isotopic data for the samples along traverses A-B and 

C-D (tables 8 and 9; fig. 14) were determined by R.W. 

Kistler. Analytical methods for determining the isotopic 

data are described in detail in Kistler and others (1986). 

MODAL DATA AND SPECIFIC GRAVITY 

Modes and specific gravities for samples from the 

Tuolumne Intrusive Suite are listed in tables 4 to 6 and presented graphically on simplified geologic maps in figures 3 

to 9. Modes are also plotted on Q-A-P diagrams in figure 

15. The modes of samples projected on traverse A-B are 

also shown in profiles in figure 10. With the exception of 

hornblende, which is present in small amounts and distributed somewhat erratically, the modal percentages of 

minerals are contoured on the maps at 5-percent intervals. 

Specific gravity is contoured on figure 9 at intervals of 0.05. 

The maps (figs. 3-9) show that quartz and alkali feldspar 

increase inward in the suite, that hornblende, biotite, and 

specific gravity decrease, and that plagioclase is distributed 

irregularly. In most places, contours lie within the units 

rather than on contacts between them, but they follow contacts where magmatic surges have eliminated significant 

amounts of material. 

Modal plots of samples from the Tuolumne Intrusive 

Suite (fig. 15) show that each of the units has its own field 

and that a composite field for the suite would be slightly 

curved, extending from the upper part of the quartz diorite 

field across the lower part of the granodiorite field and into 

the granite field. Most samples of the older granitoids in 

the northwestern and southeastern parts of the quadrangle 

plot in the granite field (fig. 16), but the granodiorite of Red 

Devil Lake plots in the granodiorite field. 

Details of the modal changes within the Tuolumne Intrusive Suite are best shown by the samples along traverse 

A-B (fig. 10). The greatest changes occur within the outermost units, the tonalite of Glen Aulin and the granodiorite 

of Kuna Crest and the outer part of the equigranular facies 

of the Half Dome Granodiorite. Farther inward to the 

Johnson Granite Porphyry, modal changes are small. The 

amounts of quartz and alkali feldspar increase inward, and 

the amounts of plagioclase, biotite, and hornblende decrease. 

Specific gravity also decreases. Continued inward decrease 

of biotite and alkali feldspar across the megacrystic facies 

of the Half Dome Granodiorite differ somewhat from the 

pattern for other minerals. 

Smaller amounts of quartz and alkali feldspar and larger 

amounts of plagioclase and hornblende in the outer part of 

the tonalite of Glen Aulin than in the granodiorite of Kuna 

Crest indicate that the west side of the suite began to solidify 

somewhat earlier than the east side. 

MAJOR ELEMENTS 

The major elements also show the greatest variations in 

the outer parts of the Tuolumne Intrusive Suite (fig. 11). 

Si02 and K20 increase into the equigranular facies of the 

Half Dome Granodiorite, Al20 3 and CaO show a reciprocal 

relation to Si02 and K20, decreasing inward into the equigranular facies of the Half Dome Granodiorite, and remaining fairly constant inward to the Johnson Granite Porphyry, 

where they decrease abruptly. Fe20 3, FeO, and MgO also 

decrease into the equigranular facies of the Half Dome 

Granodiorite, but continue to decrease by smaller amounts 

into the Johnson Granite Porphyry. Na20 behaves differently than any of the other major elements. In the west flank, 

it increases erratically inward to the megacrystic Half Dome 

Granodiorite, jumps to 4 weight percent or greater through 

the inner part of the Cathedral Peak Granodiorite, then 

decreases sharply into the Johnson Granite Porphyry. In the 

east flank, it increases inward into the outer part of the 

Cathedral Peak Granodiorite, remains constant across the 

Cathedral Peak Granodiorite, then decreases in the Johnson 

Granite Porphyry. 

CIPWNORMS 

CIPW norms are given in tables 1 to 3 and are plotted 

on a triangular quartz-plagioclase (albite + anorthite)-orthoclase diagram in figure 18. As with the modes, the different units plot in overlapping but discrete fields. The 

composite plot of norms in figure 18 forms an elongate field 

that shows no curvature, unlike the composite field of 

modes. 

TRACE ELEMENTS 

Trace-element abundances of samples projected on 

traverses A-B and C-D are given in tables 1 and 2, and 

those projected on traverse A-B are shown graphically in 

figure 12. The transition metals all decrease inward from 

the margins into the equigranular facies of the Half Dome 

Granodiorite, remain relatively constant across the megacrystic facies of the Half Dome and the Cathedral Peak 

Granodiorite, and decrease further in the Johnson Granite 

Porphyry. Lanthanum, rubidium, zirconium, lead, uranium, 

and thorium all increase inward near the margins of the suite 

but follow different patterns inward in the suite. Lanthanum 

3 
rises inward into the equigranular facies of the Half Dome 

Granodiorite, but farther inward varies with cerium, remaining more or less constant into the Johnson Granite Porphyry, 

where the abundance of both elements is erratic. Rubidium, 

zirconium, and lead increase by small amounts inward in 

the tonalite of Glen Aulin, remain constant across the Half 

Dome and Cathedral Peak Granodiorites, and increase in the 

Johnson Granite Porphyry. Uranium and thorium increase 

inward in the tonalite of Glen Aulin, decrease across the 

Half Dome Granodiorite, remain constant across the Cathedral Peak Granodiorite, and decrease in the Johnson Granite 

Porphyry. The amounts of barium, strontium, and niobium, 

although variable, are grossly constant across the suite. 

PLAGIOCLASE COMPOSITIONS 

The anorthite content of plagioclase generally varies 

within crystals by about 15 to 20 percent, and both the maximum and the minimum anorthite contents decrease inward 

in the suite. The greatest decreases are in the outermost 

units, but decreases continue by lesser amounts inward into 

the Johnson Granite Porphyry (fig. 13). Along the west half 

of traverse A-B, the general compositional range decreases 

from An42 to An22, in sample 1 in the outer part of the 

tonalite of Glen Aulin, to An21 to An8, in sample 20 in the 

Johnson Granite Porphyry, and similar change occurs across 

the east flank. Determinations along traverse C-D, which 

crosses contacts between units at a small angle, show that 

compositions are nearly constant across both the equigranular and megacrystic facies of the Half Dome Granodiorite 

and decrease at the contact with the Cathedral Peak Granodiorite. Scattered determinations of larger amounts of anorthite than the general range within crystals denote lag in the 

separation of crystals formed at higher temperatures and (or) 

with smaller amounts of H20 in the melt phase of the 

magma. Anorthite contents less than the general range 

probably represent late crystallization from interstitial melt 

except for plagioclase less than about An8, which probably 

represents reequilibration to subsolidus temperatures. 

STRONTIUM ISOTOPES 

Strontium isotopic data for the samples projected on 

traverses A-B and C-D across the Tuolumne Intrusive Suite 

are given in tables 8 and 9 and shown graphically in figure 

14. The data for samples along traverse A-B show that initial 87 Srf6

sr increases inward from the margin of the suite 

into the equigranular facies of the Half Dome Granodiorite. 

Farther inward, values remain approximately constant to the 

Johnson Granite Porphyr~7 where they may rise slightly. 

The total range of initial Srl6

sr is 0.0009, from 0. 7057 

to 0.7066. Although the range of replicate analyses of in4 

dividual samples is as much as 0.0003, the plot in figure 14 

clearly shows that initial 87 srl6sr increases from about 

0. 7057 in the outer part of the tonalite of Glen Aulin to 

about 0. 7064 in the middle of the equigranular facies of the 

Half Dome Granodiorite, that no significant changes take 

place farther inward to the Johnson Granite Porphyry, and 

that it probably rises to 0.7066 in the Johnson Granite Porphyry (the value obtained on three samples), even though 

this change is less than the range of replicate analyses. 

JOINTS 

The distribution of joints visible on aerial photographs is 

shown in figure 19. The most prominent set trends N. 20°-

300 W. on the average, but many joints strike in other directions. The joints are continuous across contacts between 

different rocks. They reflect both regional stresses and 

stresses that accompanied cooling of the batholith during 

uplift and erosion. 

REFERENCES CITED 

Bateman, P.C., and Chappell, B.W., 1979, Crystallization, fractionation, and solidification of the Tuolumne Intrusive Series, 

Yosemite National Park, California: Geological Society of 

America Bulletin, Part I, v. 90, p. 465-482. 

Bateman, P.C., Kistler, R.W., Peck, D.L., and Busacca, Alan, 1983, 

Geologic map of the Tuolumne Meadows quadrangle, Yosemite 

National Park, California: U.S. Geological Survey Geologic 

Quadrangle Map GQ-1570, scale 1:62,500. 

Frey, F.A., Chappell, B.W., and Roy, S.D., 1978, Fractionation of 

rare-earth elements in the Tuolumne Intrusive Series, Sierra 

Nevada batholith, California: Geology, v. 6, p. 239-242. 

Kistler, R.W., Chappell, B.W., Peck, D.L., and Bateman, P.C., 1986, 

Isotopic variations in the Tuolumne Intrusive Suite, central Sierra Nevada, California: Contributions to Mineralogy and Petrology,v.94,p.205-220. 

North American Commission on Stratigraphic Nomenclature, 1983, 

North American stratigraphic code: The American Association 

of Petroleum Geologists Bulletin, v. 67, no. 5, p. 841-875. 

Reid, J.B., Evans, O.C., and Fates, D.O., 1983, Magma mixing in 

granitic rocks of the Sierra Nevada, California: Earth and 

Planetary Science Letters, v. 66, p. 243-261. 

Rose, R.L., 1957, Andalusite- and corundum-bearing pegmatites in 

Yosemite National Park, California: The American 

Mineralogist, v. 42, p. 635-64 7. 

Stem, T.W., Bateman, P.C., Morgan, B.A., Newell, M.P., and Peck, 

D.L., 1981, Isotopic U-Pb ages of zircon from the granitoids of 

the central Sierra Nevada, California: U.S. Geological Survey 

Professional Paper 1185, 17 p. 

Streckeisen, A.L., 1973, Plutonic rocks: Classification and 

nomenclature recommended by the lUGS Subcommission on 

the systematics of igneous rocks: Geotimes, v. 18, no. 10, p. 

26--30. 
FIGURES 1-19; TABLES 1-9 

··~=============================================================================== 
6 

CALIFORNIA 

119°45' 38°15'~---------.-----------.----------4 

3~30'~--------~--------~--------~ 

Figure 1. Index map showing locations of Tuolumne 

Meadows 15-minute quadrangle, California, and of contiguous 15-minute quadrangles. 

EXPlANATION 

~ Aplite 

0 

Johnson Granite Porphyry 

~ Cathedral Peak Granodiorite 

~ Half Dome Granodiorite 

Khdm-Megacrystic facies 

Khd-Equigranular facies 

Wi~i"Y~ Wi~M Tonalite of Granodiorite of 

Glen Aulin Kuna Crest 

Northwest part 

of quadrangle 

0 

Yosemite Creek granodiorite 

of Rose (1957) 

Granodiorite north 

of Tuolumne Peak 

Granodiorite 

~ of 

Mono Dome 

oJ 

.!!I 

i§ 

J.o 

Southeast part 

of quadrangle 

Granite of 

Turner Lake 

j~ Leucogranite of Granodiorite of 

Ten Lakes Red Devil Lake 

Granodiorite 

~80GiJ of Granodiorite of Granite of Leucogranite of 

Double Rock Mount Hoffman Ireland Lake Gallison Lake 

+ + + + 

~ qcl+ t- + + + 

Quartz diorite Metagranite 

Metamorphic rocks 

Contact, dashed where ------ gradational 

• Modally analyzed sample ® Chemically and modally 

analyzed sample 

CRETACEOUS 

Figure 2. Generalized geologic map of the Tuolumne Meadows 

quadrangle showing locations of chemically and modally 

analyzed samples. Underlined numbers denote samples that 

are projected on traverses A-8 and C-D (field numbers are 

prefixed with Z- in tables). Hyphenated sample numbers are 

prefixed with K-in tables. Letters shown in rectangular boxes 

at top of each quadrant (TMa-, for example) prefix other sample 

numbers within the quadrants. 
Kt 

.1-75 

.2-75 

• ~ .75 ~ .19-75 

.56 46-75 ~ 47- ~ .2a-75 

29 45.-75 • 27-~5 

• .sa •2a-1s 

44-75 24-75 • 

.34 .26-75 • 42-75 

• 20-75 49-75 

• ss .57 .43-75 .51 

.25-75 Kcp 

.so 

.52 

.33 .22-75 ~1-75 

48-75 

. • 54 55-75 .so-75 41 -75. 

53-75. 

56-75 

Khd 

.1-74 

.103 

Kcp 

.2 

®~ 

.164 

.167 .165 .156 

169. 

.157 

.162 

.161 

.159 .52 

160 

. .154 

.155 

·>/:>:~ 

::: 42~ .11 .10 .153 56. 

34. ::-::-< ··.- . • 30 

.9 

.a 

.29 

• 2a .26 

.27 

.25 

.14 

Kcp 

ss. 

sa • 

.54 

.57-75 

.52-75 

.sa-75 51-75 

.158 

.154 

.153 

.155 

.152 

.4 

.157 .161 

Kcp 

.161 

.162 

.164 .166 

.165 .171 

.169 

.51 

•a2 .s2 

.31 

.so .39 

.29 .30 

.2a 

·24 

.22 

.23 

.as 

0 2 3 KILOMETERS 

0 2 3 MILES 

7 
Kt 

.30 

·28 ·28 

·28 .28 ·26 .27 

/30...-:;;r 

L__/.25 .25 

.28 

·26 

.27 

.27 

.28 

.29 

.26 

/

•

25 

·31 II 

l'•j28 

~ Kcp )~ 

·26 • . .• 28)·· .26 28 \· ·.·. 33· .. 

Kcp 

.25 

.28 

.29 

.27 

.32 

.28 

27.26 29~.:: io2s"27 

• 33) / ·24 Kcp 

2s ~~17Kt>·26 .28~ ~ ·26 

19\ .16 .32 J ·29 

....... . ·2~ 27 

.27 .26 .::3 ~~~ 

·22 

.23 .22 

·25 

·25 

0 

0 

•23 

2 

.25 

.27 

3 KILOMETERS 

2 3 MILES 

.22 Km 

mg 

.31 

Figure 3. Generalized geologic map of Tuolumne Meadows 15-minute quadrangle showing volume-percent quartz at sample localities 

(dots). lsopleths (heavy lines) for Tuolumne Intrusive Suite at intervals of 5 percent. See figure 2 for explanation of geology. 

8 
·24 

·23 

·20 

·21 

·20 .22 

·23 

0 2 3 KILOMETERS 

0 2 3 MILES 

Figure 4. Generalized geologic map of Tuolumne Meadows quadrangle showing volume-percent alkali feldspar at sample localities (dots). 

lsopleths (heavy lines) for Tuolumne Intrusive Suite at intervals of 5 percent. See figure 2 for explanation of geology. 

9 
119°15' 

•44 

.45 30 .42 

• 44 . •42 

•41 

·34 .41 ·38 

•44 ·39 

.39 Kcp 

.41 

.44 

.41 .41 

.38 

•41 

.40 

Kho 

·30 ·42 

0 2 3 KILOMETERS 

0 2 3 MILES 

Figure 5. Generalized geologic map of Tuolumne Meadows quadrangle showing volume-percent plagioclase at sample localities (dots). 

lsopleths (heavy lines) for Tuolumne Intrusive Suite at intervals of 5 percent. See figure 2 for explanation of geology. 

10 
·3 

.3 

·5 

.4 .6 

·3 

.4 

•4 

Kt 

.s 

·4 ·2 

•4 

•4 

·4 

·3 

0 

0 

.5 

.4 

•4 

·4 

3 

·1 ·3 

.2 

.3 

.3 

.3 

·3 

·4 

Kcp 

.4 

·3 .4 

·4 

•4 

2 3 KILOMETERS 

2 3 MILES 

.4 

·3 

.4 

·5 ·3 

·4 

Figure 6. Generalized geologic map of Tuolumne Meadows quadrangle showing volume-percent biotite at sample localities (dots). 

lsopleths (heavy lines) for Tuolumne Intrusive Suite at intervals of 5 percent. See figure 2 for explanation of geology. 

11 
119°15' 

·o 

.tr .1 

·0 ·0 .o .o 

•tr .tr .o 

.o 

·1 .tr .o ·0 .o 

.o .tr .o 

.o Kcp 

·1 

.tr ·0 .o .o .o • tr 

.2 .o .o 

.o 

Kt .o 

.o • tr .o 

.o .o .o ·0 .o 

.o 

.o 

.o .1 

·1 

•tr 

.o 

Kcp 

•tr ·1 

.tr .1 

.1 •tr 

.1 .tr 

tr• • tr 

·2 • tr Kcp ·1 ·1 ·'I ·.· .• o ·.· . .1 

·3 • 1 

.1 .o 

.tr • tr 

.1 •tr .o 

.1 .1 • tr 

•tr 

.o •tr 

.1 

.1 .tr .3 

•tr .3 

·1 

·1 .1 

·2 .1 .1 

• tr .1 

•tr 

Kcp •tr 

.2 

.1 ·2 

.1 .1 

·0 

.2 ·2 .1 

.1 ·2 

.1 

·6 

0 2 3 KILOMETERS 

0 2 3 MILES 

Figure 7. Generalized geologic map of the Tuolumne Meadows quadrangle showing volume-percent hornblende (tr, trace) at sample 

localities (dots). See figure 2 for explanation of geology. 

12 
119°45' 119°15' 

380 •4 5 .4 

00' 5 

~~ ·5 .4 

·2 .4-

•5 

·2 

.6 ·1 .3 

.5 ·5 •4 

.4 Kcp 

•3 ·4 ·4 

·4 .4 

Kt .4 

.4 

·6 .4 

.4 ·2 

•2 

.4 

.6 .4 

Kcp 

.7 

·5 

.6 ·6 

.7 •6 

·6 .6 

·1 

.a ·6 ·6 

.5 

.6 

.6 

·6 

5;--...~5 .5 

.a~.~~---

.6 Kcp ·8 

·6 •7 .6 

·1 

·1 •10 

•8 

·8 

.7 

·7 

•9 

0 2 3 KILOMETERS 

0 2 3 MILES 

Figure 8. Generalized geologic map of the Tuolumne Meadows quadrangle showing volume-percent mafic and accessory minerals at 

sample localities (dots). lsopleths (heavy lines) for Tuolumne Intrusive Suite at intervals of S percent. See figure 2 for explanation of geology. 13 
2~67 

Kt 

.2.65 

•2.62 .2.64 

.2.63 

2.65 

o268\ 

.63 

.2.64 

.2.61 

•2.62 

·2.64 

·2.63 

.2.64 

Kcp s ·2·:~ •2.64 .2.61 

.7:-:A .2.63 

.2.63 

.2.62 

Khd ~6! 

2.71 "' ·2.63 

·2.62 

.2.62 

·2.63 

2.Ss 

.2.64 

.2.64 

.2.60 ·2.63 

·2.65 

.2.62 .2.64 

.2.63 

•2.64 

0 2 3 KILOMETERS 

0 2 3 MILES 

Figure 9. Generalized geologic map of Tuolumne Meadows quadrangle showing bulk specific gravity at sample localities (dots). lsopleths 

for Tuolumne Intrusive Suite (heavy lines) at intervals of 0.05. See figure 2 for explanation of geology. 

14 
A B 

40 

.e -~ Gl -~ Gl 

~ Equigranular 

liE ~E Equigranular Kuna ~8 Cathedral Peak Johnson Cathedral Peak ~8 HaH Dome Crest c HaH Dome Qll:: 2'== ~ Qlnl 

;:tl: 21, ;:tl: 

0123 456 789 10 11 12 13 14 15 16 17 18 19 2022 23 24 25 26 27 28 29 30 31323334 Ill 11 Ill I 1 I I I I I I I I I I I I I IT Tl 

30 

N 

t: 

ca 20 ~ 

0 

10 

~ 

I~ ~ ~ ~--~ ~ V\ r--... 

I \ 

I 

0 

40 

30 

:u 

Q. 

UJ 

~ 20 

iii 

k'\ ~J ~ 

1\ I ""--- - h..........__ 

--- 1--- ./'... /\. 

1/ v '-....../ ~ v ~ \ :l!!: 

< 10 

1-

z 0 

1\ 

TJ \ 

UJ 

(.) 60 (I: 

UJ 

Q.. 

UJ 

::::!: 50 ::> 

....J Q) 0 UJ 

> ca 

13 

0 40 ·a 

ca 

a: 

30 

~ __.......... 

' ~- ~\ ~ ~ v 1\/\~ ~ 

r--- ~/ 

l/ 

v 

20 

30 

Q) 

-o 20 c 

Q) 

:0 

c 

0 10 I 

\ I 

~ ~ -:...] 

0 - 2.9 

~ 

> 

< 2.8 (I: 

<!) 

(.) 

u:::: 

0 2.7 L.U 

Q.. 

I\ 

\ v 1\ / --'---- -t- - L--~--' ~ 

(J) -- 2.6 

Figure 10. Variations of modes and specific gravities along traverse A-B (fig. 2). Data from table 4. 

15 
A B 

80 

.5 .!ol Q) .!ol Q) 

liSE liSE 

~ Equigranular 5'8 Cathedral Peak Johnson Cathedral Peak 5'8 Equigranular Kuna c 

Q) Half Dome &=:a &=:a Half Dome Crest 

a :II 21, :II 0123 1456 7 89 10 11 12 13 14 15 16 17 18 19 2022 23 24 25 26 27 28 29 30 31323334 1111 II Ill I I I I I I I I I I I I I T T I I II I I 

70 

ON 

i:i) 

60 

__./ ~ 

""' /~ r--v - -- _/\ ~ 

( 

50 

19 

17 

o: 

< 

15 

I 

\ / f-J 

\/\ l------

r--.... ------ \....---- ---....... ~ 

~ D v "'-./ 

13 

3 

2 

o: 

Q) 

t- u. 

z 

UJ 

(.) 

~ I~ 

\~ 

~ ~ v 

~ £:::-...... i/ a: - UJ 

a.. 0 tI 

(!) 

jjj 5 ~ 

4 

3 

0 

Q) 

u. 

2 

\ 

\ 

~ J 

l, -'"' I ~ ~ v ~ 

------- r-...--

~ ~ V"- 0 

4 

\ 

\ )J 1\ 

3 

~ ........... 

_....,-~7 

0 

~ f<::=::= v ---- Figure 11. Variations of major oxides in samples 0-34 projected on traverse A-B (fig. 2). Data from table 1. 

16 
A 8 

10 

.5 .!.l ID 

~~ ~ liE 

Equigranular 5'8 ~0 Equigranular Kuna 1: Cathedral Peak Johnson Cathedral Peak ~0 Half Dome &~ i'~ Half Dome Crest ID 

a ~I 21, ::::EI 

012_.: 456 789 10 11 12 13 14 15 16 17 18 19 2022 23 24 25 26 27 28 29 30 31323334 Ill I" I I " I I I I I I I I I I 

8 

0 

Ill 6 () 

4 

l 

\ ~ 1\ / V\ 

--------- ~ 1---- - ~ - ~ / "K:>V 2 

4.5 1-

z 

w 

() 

a: 4 w 0 a.. cd" 1- z I 

C) 3.5 

w 

~ 

/\. 

~\ v ~ ~ 

AJ ----f-""'""" \ 

."'. 

'~V 

k/ ~ ~ r3 

5 

4 

0.. 3 ~ 

2 

('v ~ 

~ ~I ............ 

I'- ~ v k/\ v \ x 

I 

Figure 11. Continued. 

17 
18 

' ~ 

\ 

100 ~ ~. 

Cathedral Peak 

14 15 16 17 18 

.... 

-- ---

Johnson 

21, 

1920 22 23 2425 

{\ 

' I ~I 

-......... I 

Cathedral Peak 

26 

f\ --.. -·-- '../v ..._ I 

I 

~ ~·-·--

--... "" I ... __________ ..... , "' ____ ..,., .... 

----

................. ,.-· ...... - - -L ~- ----- -·- - .... - -· ....... - -· ~. r.., .... -----·-·-- ............. I ................ .,. 

I ,,.,, ,' 

/ ...... ,, ! 

.-·-- ·-·-·-·-·---·-·-·---.~ r:; //·-.,i: 

/ 

-----

r--t--'\1---: ....k.r¥,'1:--_--+'_\~r--:>t------t-'---';~----+-; ---l\.......---'tl--....... -"'--'l:i-f+///f-/ ___ '_··,~~---- +-t----.~,1 /,. 

\ I :1 I \ ,/\ Cr ,i I ' • ! ·,, V! f ' / ____ ,_ 

r--r-~~~i~' ___ J~·+-~~·t~·-~\r---~+-~\~_-+f_'+i-~~'~-'-·~,~~~~------'~··,~-~~~~:-~----------~r---~· ''·--~ \\ ,/ ·,,! '•,, i ! \ ! '·., : \ _,.. I I l~T'<Mo 

.l 

I 

I 

l 

. ...._ 

• '·· ,,L ... , \ I ' i p. \ i ~Ni >< i \-,//I ··--~-- N t~---~'::.- I ! ------------------- _)( / __________ ___, .... r\ \. _....._ 

/ ,, 

/ .. -- ~ \ : 

• 

0.1~~--------~--~~--------------------------~----~--------------------L--L--------------L-~ 

Figure 12. Variations of trace elements in samples 0-34 projected on traverse A-B (fig. 2). Data from table 1. Vertical scale is 

logarithmic. 
z 

0 

3 

~ 

a: 

w 

n. 

en 

~ 

~ 

A 

Equigranular 

Half Dome 

10 

~~ 

:~:I: 

~~ 11 12 13 

Cathedral Peak Johnson 

21, 

14 15 16 17 18 1920 22 

B 

~~ 

Cathedral Peak 

~~ Equigraoolar Kuna 

Half Dome Crest 

:~:I: 

23 2425 26 27 2ll 29 31323334 

--

- --------r-------------------+-----1-------------+-----t--------+-----l 

100~+========t===t======================~=====t================+==t==========~==~ 

,'\ r----- -'-.. i A \, /1>---------- ,'~ 

"\ I 

1----~-+------~~ '·..( - -·- · / ..--- \~ \ ' i I 

_j_ "'- ----------- ./ ---u--------=-----11-~-:..,--·,_-.. -+-;;----;J,__ ____ -=---....."----+---+-------=---....--c__....__ -+-----4 

·-·--·----

-----------------~-~--~+-----------'"'<--.._1"+--11 ~' !/ ~~~~~'v----t+-~~--~t-----i """ / 

Figure 12. Continued. 

19 
A B 

,§ i~ :§~ i Equigraoolar ~8 Cathedral Peak Johnson Cathedral Peak iB Equigranular Kuna 

c Half Dome i.,. 5r,. Half Dome Crest • 5rca (; ~:::t 21, ~:::t 

1000 

0123 456 789 10 11 12 13 14 15 16 17 18 1920~ 23 2425 26 27 28 29 31323334 

/ "' ..- -'<Ba / 

/"oo / " ......... ... ' \ p._ 

I.J\ '\ , I / "' ,.-- ' .. ---- ------~-..1. I \ /, - - ______ ..,... ---- ------ " N. v .... .... '-Sr \ ----;.-.. \ t' -·--------- ' ~ 

I' I ........ / " ---~ \ I I \ 1 

\I / 

/~ ----- ., 

v 

~ LRb _ ,_-------- ----------/~ \ 

j --...... \ 

{j ~ .... \ 

~---""-zr -.... -- =-=-- -.-- ------.. ,. .... -",\ ,.. ------- __ _..,._ 

100 ' - -· I 

I ,__ ------

-- --~ 

~ 

' ·, I 

\ I 

I~ 

r--\. A 

/· ---- _ ... _/Nb .. ----- _ _...------ / 

..,.. .... ~· - ---- -...... ___ __ .. _..,._ - ' ·----------- -- -- ----- _........ 

10 

- \ ---..... --- ... _, I / . I[-- ,_ 

~ 1'---. 

"Sc 

/ 

-- ~ / 

~ v ~ 

20 
80 

z 60 

< 

1-

z 

w 

~ 40 w 

a.. 

..J 

0 

:I 20 

0 

A 

.E 

~ Equigranular 

c: Han Dome CD 

(ij 

1 3 5 7 9 10 11 

I I I I 

~: Cl a 

_., 0 

~ ~~ c; ~ : C ~ ~ a a ~ o= ::':. r... 0 I? .,. le 

'n 

.Y~ ls 

::~::r:: ~== 

12 

I! 

0 

[ 

D 

13 

~ 

~ 

D 

80 

z 60 < 

1-

z 

w 

~ 40 w 

a.. 

..J 

0 

:I 20 

0 

Cathedral Peak Johnson 

14 15 16 17 18 19 2022 

Cl 

= : 0 a 0 0 

C7 i? D a 0 

2 I? I>=D (j' = r.. 

[(= ~ ~ ~~ D 

~ ~~ D 0 0 !:' = 

c 

Equigranular Megacrystic 

HaHDome HaHDome 

36 37 38 39 40 41 42 43 45 46 4748 49 

I I I I I I 

a n 0 

~a [? a [j' g 

~ ~ ~ ~~ Cl 

a ~; ~ W !;! =o _]',.~ 0 ~ f.r,~ J;2.. .1\. ~ ~ .,. "' 0 = D rr 0 If 0 

a a a D 0 

n :: n n ~ II 

B 

~~ Cathedral Peak ~8 Equigranular Kuna 

~ .. HaH Dome Crest Q)lll 

::~::r:: 

23 24 25 26 27 28 29 30 31323334 

I I I I I I I 

D 

' 

~i D 

6 c;, I? u ~ ~ I? [ ~ ~ . r.. Es 1'1 [?' 1'::> 

~· Cb[3. Cl ~ ~ :;' 

: 0 

0 

Cathedral Peak 

51 52 14 

I I I 

Cl 

= 

p ~ 2 

(j== 

~ p= 0 a 

Figure 13. Variations of plagioclase compositions in selected samples (numbered) projected onto traverses A-Band C-D (fig. 2). 

21 
A B 

.§ ~~ ~~ 

i Equlgranular 

~~ Cathedral Peak Johnson Cathedral Peak h Equigranular Kuna 

c Half Dome Half Dome Crest 

a ::~::t ::~::t 

123456 789 10 11 12 13 14 15 16 17 18 19 2021 23 24 25 26 27 28 29 30 31323334 ITT TT TTl I I I I I I I I I T r I I I I I I 

.707 a: 

U) 

~ Gi .706 ...J 

c( 

. . . . . . . .~ . . . . . . . ..:.... : 1"--t--...... ~. . . ~ 

i= 

~ .705 

c D 

Equigranular Megacrystic Cathedral Peak Half Dome Half Dome 

353637 3839 40 41 42 43~445 46 47411 4950 51 52 14 I I 'I I I I I 

.707 

ih 

I 

";::: 

ff . 706 ...J 

. . . . . . ......: . . . . . . . c( 

i= 

~ 

.705 

Figure 14. Variations of initial 87Srf6sr in selected samples (numbered) projected onto traverses A-8 and C-D (fig. 2). Data from 

tables 8 and 9. 

22 
A 10 

35 

A 10 

35 

Johnson Granite Porphyry 

65 

Megacrystic facies of the 

Half Dome Granodiorite 

a 

5 

65 

90 p 

EXPLANATION 

a 

A 

p 

35 65 

Modal classification 

(modified from Streckeisen, 1973) 

Quartz 

Alkali hldspar 

Plagioclase (An5_, 00 ) 

90 p 

35 

35 

35 

65 

Cathedral Peak Granodiorite 

65 

Equigranular facies of the 

Half Dome Granodiorite 

65 

90 p 

90 p 

EXPLANATION 

• Granodiorite of 

Kuna Crest 

x Tonalite of 

GlenAulin 

90 p 

Granodiorite of Kuna Crest and 

tonalite of Glen Aulin 

Figure 15. Modal plots on Q-A-P diagrams of Tuolumne Intrusive Suite granitoids. Data from table 6. 

23 
24 

35 

35 

A 10 

65 

65 

0 

35 65 

Modal classification 

(modified from Streckeisen, 1973) 

90 

90 

EXPLANATION 

Granitoids in northwest 

quarter of quadrangle 

+ Yosemite Creek granodiorite 

of Rose ( 19!i7l 

• Granodiorite north of Tuolumne 

Peak 

• Leucogranite of Ten Lakes 

x Granodiorite of Mount Hoffman 

p 

EXPLANATION 

Granitoids in southeast 

quarter of quadrangle 

+ Granite of Turner Lake 

• Granodiorite of Red Devil Lake 

x Granite of Ireland Lake 

Leucogranite of Galfison Lake 

p 

EXPLANATION 

a Quartz 

A Alkali feldspar 

P Plagioclase (Ans-uJO) 

90 p 

Figure 16. Modal plots on Q-A-P diagrams of granitoids predating the Tuolumne 

Intrusive Suite. Data from table 7. 
TUOLUMNE INTRUSIVE SUITE 

10 

Johnson Granite Porphyry 

5 

0 

30 

25 

Cathedral Peak Granodiorite 

20 

15 

10 

5 

0 en 

w 

_J 

a. 

::::E 

< 15 en HaH Dome Granodiorite. 

u. megacrystic facies 0 

a: 

w 10 a:l 

::::E 

=> 

z 5 

0 

15 HaH Dome Granodiorite, 

equigranular facies 

10 

5 

0 

J Granodiorite of Kuna Crest 

I u. I • 

:r 

Granodiorite of Glen Aulin 

0 5 10 • -

15 • . 20 

·-

25 

COLOR INDEX 

en 

w 

_J 

a. 

::::E 

< en 

u. 

0 

a: 

w 

a:l 

::::E 

=> 

z 

I 

30 • 35 

GRANITOIDS IN NORTHWEST 

QUADRANT OF QUADRANGLE 

5 Yosemite Creek granodiorite 

of Rose ( 1957) 

0 

J Granodiorite north of 

Tuolumne Peak 

• 

10 

Leucogranite of 

Ten Lakes 

5 

0 

5~ Mount Hoffman 

0 

GRANITOIDS IN SOUTHEAST 

QUADRANT OF QUADRANGLE 

: '-~-G_.~ .. an_.i.e'-o-f -T-ur_..n_e_r L_a_k_e__.__ _ ____J 

5 

0 

]'--_G_r_.a •• it_e_o_f_lr-el-'a-nd-La_k_e__.__ _ ____J 

5~ Leucogranite of 

Gallison Lake 

0 • 

0 5 10 

COLOR INDEX 

15 20 

Figure 17. Histograms showing color indexes (volume-percent mafic minerals) of granitoids. Data from tables 

4 to 7. 

25 
26 

\a 

65 

65 

EXPLANATION 

o Johnson Granite Porphyry 

Cathedral Peak Granodiorite 

Megacrystic facies of the 

Half Dome Granodiorite 

Equigranular facies of the 

Half Dome Granodiorite 

x Granodiorite of Kuna Crest 

+ Tonalite of Glen Aulin 

Q Quartz 

Or Orthoclase 

P Plagioclase 

An Anorthite 

Ab Albite 

90 p 

(An + Ab) 

90 p 

(An + Ab) 

Figure 18. Normative plots of Tuolumne Intrusive Suite 

granitoids. Data from tables 1 to 3. 
0 1 2 3 KILOMETERS 

0 1 2 3 MILES 

Figure 19. Generalized geologic map of Tuolumne Meadows quadrangle showing joints visible on aerial photographs. See figure 2 for 

explanation of geology. 

27 
Table 1. Chemical analyses of major and trace elements and CIPW norms of samples along traverse A-B (fig. 2) across 

the Tuolumne Intrusive Suite 

[Most elements determined by X -ray fluorescence under the direction of B. W. Chappell at the Australian National University. FeO, H20, and 

C02 determined by wet chemical methods in the laboratories of the U.S. Geological Survey] 

Tonalite of Glen Aulin Half Dome Granodiorite 

Equigranular egacryst1c 

Map No. 0 1 2 3 4 5 6 7 8 9 lO ll 12 

Field No. Z-64 Z-51 Z-52 Z-53 Z-54 Z-55 Z-56 Z-57 Z-58 Z-59 Z-60 Z-61 Z-62 

Chemical ana 1 yses (weight percent) 

Si02 ... 55.27 58.59 58~2.18 62.78 6~67.06 65.57 68.20 69.23 fi8.99 67.83 67.70 

Al 20 3 .. 17.39 16.93 16.87 16.12 15.74 15.44 14.91 15.1)7 15.19 14.55 1.5.01 1.5.44 15 .56 

Fe2o3 .. 2.84 2.26 2. 31 1. 78 2.07 1. 76 1.71 1.87 1.50 l. 67 1.40 1. 55 l. 52 

FeO .... 4.48 4.31 4. 25 3. 65 3.22 2.38 2. 27 2.24 1.60 l. 53 1.40 1.44 1.41 

MgO .... 3.80 3.26 3. 19 2.65 2. 50 1.80 1.64 l. 70 l. 21 l. 22 1.08 1.03 1.10 

CaO .... 7.13 6.25 6.22 5. 21 4.80 4.10 3.60 4.14 3.17 3.00 3.1.5 3.22 3.41 

Na20 ... 3.59 3.53 3. 62 3.45 3.25 3. 62 3.35 3.63 3.60 3.51 3. 72 4.02 3. 91 

K20 .... 1. 51 2. 38 2.04 2.83 3.22 3.11 3.89 3.20 3.88 4.02 3. 79 3.65 3.70 

H20+ ... 1.82 1.01 1.16 .84 1.06 . 78 .68 . 74 .fi2 .48 .50 .61 .54 

H20-... .33 . 14 . 13 .11 .25 . 14 .07 .13 .11 .ll. .08 .10 . 14 

Ti02 ... .94 .90 .89 .77 . 70 .54 . 54 .54 .42 .44 .42 .49 .48 

P2o5 ... . 24 .22 . 21 .18 .17 .16 . 15 .17 .15 .14 .15 . 17 .17 

MnO .... .14 .ll .ll .09 .09 .08 .08 .08 .07 .08 .06 .06 .06 

C0 2 .... .13 .07 .07 .07 .11 .09 .12 . 16 .09 . ll .09 .13 .15 

Other .. .22 .25 .22 .23 . 24 .19 .20 .22 . 21 .18 . 21 .25 .26 

Tot a 1 99.83 100.21 100.20 100. 16 100.20 99.80 100.27 99.96 1.00.02 100.27 100.05 99.99 100.11 

Trace elements (ppm) 

Ba ..... 440 720 475 660 745 515 645 BOO 745 565 735 905 1015 

Rb ..... 88 108 102 140 134 l38 127 114 141 153 138 129 104 

Sr ..... 616 574 551 507 478 451 412 509 462 397 491 658 701 

Pb ..... 15.5 12 .5 12.0 14.5 13.5 16.5 19.0 16.0 19.5 21.5 20.0 18.5 15.5 

Th ..... 12.2 16.6 l7 .0 19.4 31.8 21.8 36.4 28.6 23.0 33.2 30.8 18.0 15.4 

u ...... 3.8 4.2 5.2 5.4 8.4 7.4 9.4 6.8 10.4 10.0 5.4 5.2 4.0 

Zr ..... 86 126 139 132 143 116 ll5 114 96 96 102 119 1_22 

Nb ..... 7.0 7.5 7.5 7. 5 7. 5 6.5 8.5 7.5 7.5 9.0 8.0 7.0 6.5 

y •.•••. 18 18 17 17 26 9 13 11 9 10 9 8 7 

La ..... 19 21 23 19 24 23 20 25 18 30 28 25 23 

Ce ..... 48 47 47 39 50 38 42 45 37 49 50 44 43 

Nd ..... 19 18 18 15 22 ll 12 13 11 15 12 13 12 

Sc ..... 19 16 16 14 13 8 8 8 5 fi 5 4 5 

v ....•. 172 157 158 126 117 81 72 7l 51 52 46 46 49 

Cr ..... 24 17 23 12 13 9 5 2 6 2 2 6 2 

Mn ..... 1090 855 850 735 735 595 585 615 515 585 495 445 430 

Co ..... 27 23 24 20 18 14 12 13 10 9 8 7 7 

Ni ..... 14.0 10.5 10.5 8.5 8.0 4.5 4.0 3. 5 3.0 2.0 2.0 2.0 1.5 

Cu ..... 28.0 44.0 51 43.5 17.0 11.0 7.0 9.0 8.5 10.0 7.0 7.0 6.0 

Zn ..... 106 95 94 76 81 69 63 66 58 65 57 66 67 

Ga ..... 20.4 19.0 19.4 18.2 17.6 18.0 16.4 l7 .2 17.0 17.2 16.4 18.8 18.4 

CIPW norms (weight percent) 

Q •••••• 8.0 10.6 11.8 15.9 17.6 21.1) 22.8 21.3 24.2 25.7 25.1 22.8 22.6 

c ...... 

or ..... 9.2 14.2 12.2 16.9 19.3 18.6 23.2 19.2 23.2 23.9 22.6 21.8 22. l 

ab ..... 31.2 30.3 31.1 29.5 27.9 31.1 28.6 31.1 30.8 29.9 31.7 34.4 33.4 

an ..... 27.6 23.6 24.1 20.4 19.1 16.9 14.3 17.0 14.0 12. 1 13.2 13.1) 14.1 

di ..... 5.8 5.1 4.7 3.7 3.2 2.1 2. 2 2. 2 . 7 l.l) 1.3 1_ .3 l.'i 

hy ..... 11.7 10.5 10.5 9.0 8.0 5.7 5. ,_ 1).1 3.8 3.2 2.9 2.7 2.7 

mt ..... 4.2 3.3 3. 4 2.6 3.0 2.6 2. 5 2.7 2. 2 2.4 2.0 2. 3 2. 2 

il ..... 1.8 1.7 1.7 1.5 1.3 l.O l.O l.O .8 .8 .8 .9 .9 

ap ..... .6 . 5 .5 .4 .4 .4 .4 .4 .4 . 3 .4 .4 .4 

Tot a 1 100.1 99.8 100.0 99.9 99.8 99.9 100.1 100.0 100 .l 99.8 100.0 100.1 99.9 

28 
Table 1. Chemical analyses of major and trace elements and CIPW norms of samples along traverse A-B (fig. 2) across the Tuolumne 

Intrusive Suite-Continued 

Cathedral Peak Granodiorite Johnson Granite Porphyry Cathedral Peak Granodiorite 

Sample no. 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 Field no. Z-63 Z-35 Z-10 Z-36 Z-11 Z-37 Z-38 Z-39 Z-18 Z-19 Z-12 Z-40 Z-1.3 Z-14 Z-41 

Chemical analyses (weight percent) 

Si02. •'• 69.72 68.02 69.22 69.89 69.76 70.08 71.51 73.95 71.65 74.24 74.66 70.24 70.49 69.60 67.98 

A 1203 .. 15.02 15.73 15.38 15.32 15.49 15.14 14.75 13.75 14.87 13.55 13.80 15.03 15.06 15.34 15.89 

Fe2o3 .. 1.39 l. 59 l. 36 1.14 1.24 1. 26 . 78 . 59 .84 .66 .56 1.16 1.11 1.30 1.59 

FeO .... 1.18 l. 28 1.00 1..05 .95 1.08 .89 .60 .81 .48 .28 1..07 .83 .95 1.40 

MgO .... .81 .87 .77 .67 .66 .71 .49 .28 .38 .18 .19 .63 .61 . 70 .98 

CaO .... 2.90 3.10 2. 73 2. 78 2.52 2. 79 2.07 1.36 1.87 1.15 1.52 2.47 2.41 2.68 3.57 

Na2o ... 4.03 4. 34 4.31 4.43 4.33 4.62 4.07 3. 71 3.98 3.22 4.17 4.39 4.33 4. 31 4.37 

K20 .... 3. 59 3.59 3.63 3. 30 3. 72 2.84 4.19 4.58 4.19 5.47 3.80 3. 55 3.62 3.64 2.96 

H20+ ... .59 . 56 .49 .49 .45 .55 .50 .56 .58 .43 .38 .49 .60 .58 .45 

H20- ... .08 .12 .14 .07 .09 .14 .17 .18 .17 .09 .16 .10 .19 .23 .08 

Ti02 ... .42 .47 .40 .38 .37 . 39 .28 .16 .24 .14 .13 .38 .33 .38 .50 

P2o5· .. . 15 .18 .14 .14 .13 .15 .10 .04 .08 .03 .03 .13 .12 .14 .19 

MnO .... .06 .06 .05 .05 .05 .06 .05 .05 .04 .03 .02 .06 .O'i .06 .06 

C0 2 .... .11 .04 .05 .04 .05 .11 .07 .03 .13 .08 .06 .05 .09 .08 .02 

Other .. . 21 .26 . 24 . 21 .22 .17 .21 . 20 .26 .23 .12 .23 .21 .23 .23 

Total 100.26 100.21 99.91 99.96 100.03 100.09 100.13 100.04 100.09 99.98 99.88 99.98 100.05 100.22 100.27 

Trace elements (ppm) 

Ba .... 670 915 860 610 740 250 760 940 1170 1o85 325 755 680 785 705 

Rb .... 135 129 134 127 137 132 165 189 158 207 150 143 131 133 107 

Sr .... 582 710 663 641 621 585 525 277 484 301 369 628 609 648 695 

Pb .... 18.0 16.5 18.5 17.5 19.0 18.5 20.5 24.5 23.5 29.5 22.0 18.0 19.5 19.0 15.0 

Th .... 20.0 16.6 18.6 15.6 18.4 18.4 16.8 16.4 16.8 24.2 19.4 19.2 17.2 19.6 16.4 

u ••... 4.8 4.0 6.0 6.6 8.8 5.2 6.0 4.0 3.8 5.2 2.6 4.2 6.0 5.0 2.8 

Zr .... 117 136 123 123 126 131 112 111 138 130 59 130 116 125 122 

Nb .... 7.0 8.5 7.5 7.0 7.5 7.5 7.0 9.0 9.0 4.5 5.5 8.5 7.5 8.0 7.5 

Y ..... 6 8 7 7 7 7 6 7 8 4 3 7 6 7 8 

La .... 23 30 31 27 29 27 22 23 31 34 17 28 27 31 28 

Ce .... 37 49 50 44 49 45 35 44 58 65 25 50 46 51 45 

Nd .... 10 14 16 l3 14 13 11 13 15 18 7 14 14 15 13 

Sc .... 4 4 4 3 3 3 2 2 2 1 2 3 3 3 5 

v ..... 39 41 36 31 33 34 22 8 18 11 9 30 28 35 47 

Cr .... 3 d 6 <1 1 5 d <l d 6 2 6 6 2 d 

Mn .... 435 465 420 380 405 455 390 355 335 250 190 495 410 430 480 

Co .... 6 7 4 5 5 4 4 2 2 2 1 5 4 6 6 

Ni .... .5 2.0 2.0 1.0 1.5 l.S 1.0 .5 2.0 1.5 1.0 .5 1_.5 1.0 2.0 

Cu .... 6.5 7.0 4.0 3.5 4.0 5.5 8.5 6.5 7.5 3. 5 2. 5 7.0 4.'i 4.5 4.5 

Zn .... 56 67 62 55 60 67 54 43 54 28 23 69 58 63 64 

Ga .... 18.8 19.2 19.8 19.8 19.6 21.0 19.2 17.2 18.4 16.6 18.0 20.2 19.4 19.4 20 

CIPW norms (weight percent) 

Q ..... 25.8 21.9 24.0 25.1 24.4 25.9 26.9 31.7 28.2 32.1 32.7 25.4 26.0 24.'i 22.8 

c ..... .1 . 3 .6 . 3 .1 

or .... 21.4 21.4 21.7 19.7 22.2 16.9 25.0 27.3 25.0 32.6 22.7 21.2 21.6 21.7 17.6 

ab .... 34.4 37 36.8 37.8 36.9 39.4 34.7 31.7 34.0 27.5 35.6 37.5 37.0 3fi.8 37.2 

an .... 12.4 12.9 12.0 12.3 11.7 12.3 9.7 6.5 8.8 5.6 7.4 10.9 11.1 ll. 9 15.1 

di ...• .9 1.1 .6 .6 . 5 <.05 .5 .5 . 2 .5 1.2 

hy .... 2.0 2.0 1.8 1.9 1.9 1.9 1.9 1.2 1.4 .6 .6 1.9 1.6 1.7 2.4 

mt .... 2.0 2.3 2.0 1.7 1.8 1.8 1.1 .9 1.2 l.O .2 1.7 1.6 1.9 2.3 

il .... .8 .9 .8 . 7 . 7 • 7 .5 . 3 .5 . 3 . 2 . 7 .6 . 7 1.0 

ap .... .4 .4 .3 .3 .3 .4 .2 .2 .1 <.05 .1 .3 .3 .3 .5 

Total 100.1 99.9 100.0 100.1 100.0 99.8 100.0 100.0 99.9 100.1 100.1 100.1 100.0 100.0 100.1 

29 
30 

Table 1. Chemical analyses of major and trace elements and CIPW 

norms of samples along traverse A-8 (fig. 2) across the Tuolumne 

Intrusive Suite-Continued 

Half Dome Granodiorite Granodiorite of 

Megacr. Equigranular Kuna Crest 

Sample no. 28 

Field no. Z-42 

Si02 •.. 

Al 2o3 .. 

Fe2o3 •. 

FeD .. .. 

MgO .. .. 

GaO .. .. 

Na2o .. . K20 .. .. 

H20+ ••. 

H20-... 

Ti02 •.. 

P2os .. . MnO .. .. 

C02 .. .. 

Other •. 

Total 

Ba ..... 

Rb ••••• 

Sr ••... 

Pb ••••• 

Th .... . 

u .... .. Zr .... . 

Nb ••••• 

Y ...... 

La ••••• 

Ce •.... 

Nd .... . 

Sc .... . 

v .... .. Cr .... . Mn .... . 

Co •...• 

Ni ..... 

Cu ••... 

Zn ••••• 

Ga •.... 

Q •••••• 

c ...... 

or ••... 

ab ..... 

an ...•. 

di ..... 

hy .•.•• 

mt .... . 

il. .. .. 

ap .••.• 

67.17 

15.97 

1. 79 

1.47 

1.15 

3. 62 

4.07 

3.49 

.53 

.10 

.53 

.19 

.06 

.02 

.26 

100.42 

1015 

114 

699 

17.0 

15.6 

4.2 

118 

7.0 

8 

26 

43 

14 

5 

57 

2 

475 

9 

2.0 

6.5 

70 

18.6 

21.5 

20.7 

34.6 

15.1 

1.4 

2. 7 

2.6 

l.O 

~ 

Total 100.1 

29 

Z-43 

30 

Z-16 

31 

Z-44 

32 

Z-45 

Chemical analyses (weight percent) 

66.18 

15.71 

1. 74 

2.10 

1.60 

3. 97 

3. 77 

3.24 

.62 

.09 

.55 

.18 

.07 

.05 

. 24 

100.11 

840 

107 

579 

17 .o 

35.8 

6.0 

123 

8.5 

11 

25 

46 

15 

6 

66 

8 

565 

9 

3.0 

9.0 

64 

17.4 

70.35 

14.48 

1.20 

1. 27 

.96 

2.80 

3.41 

3.96 

.56 

.19 

.33 

.10 

.06 

.18 

.18 

100.03 

63.47 

15.81 

2.14 

3.03 

2.28 

4. 72 

3.32 

3. 22 

.88 

.15 

.72 

.17 

.09 

.03 

.26 

100.29 

61.87 

16.25 

2.26 

3.23 

2.56 

5.11 

3.46 

2.84 

.91 

.18 

.77 

.19 

.10 

.07 

.28 

100.08 

Trace elements (ppm) 

560 

163 

380 

24.0 

34.4 

11.6 

97 

7.5 

8 

26 

39 

ll 

4 

40 

8 

475 

9 

3.0 

5.5 

46 

15.4 

905 

123 

515 

13.0 

31.4 

9.0 

174 

9.0 

l7 

23 

44 

16 

12 

113 

9 

680 

16 

7.0 

18.5 

78 

18.0 

1040 

113 

563 

12.5 

19.6 

8.2 

182 

9.0 

15 

27 

50 

17 

13 

123 

lO 

780 

18 

7.0 

15.0 

89 

18.8 

CIPW norms (weight percent) 

21.4 

19.3 

32.2 

16.5 

1.7 

4.8 

2.5 

1.1 

0.4 

99.9 

28.3 

23.7 

29.2 

12.6 

0.6 

3.0 

1.8 

0.6 

0.2 

100.0 

18.5 

19.2 

28.4 

18.9 

2.9 

7.1 

3.1 

1.4 

0.4 

100.0 

16.3 

17.0 

29.7 

20.7 

3.0 

8.0 

3.3 

1.5 

0.5 

100.0 

33 

Z-46 

62.48 

16.03 

2.39 

2.98 

2.40 

4.98 

3.46 

2.89 

.90 

.15 

.74 

.17 

.09 

.06 

. 24 

99.96 

745 

ll9 

482 

15.0 

38.4 

11.0 

130 

8.0 

16 

25 

48 

18 

14 

123 

16 

725 

18 

7.5 

26.5 

78 

16.8 

17.5 

17.3 

29.7 

19.9 

3. 2 

7.0 

3.5 

1.4 

0.4 

99.9 

34 

Z-47 

59.74 

16.58 

2.15 

4.10 

3.12 

5.91 

3.41 

2.45 

1.12 

.14 

.85 

.20 

.11 

.07 

.23 

100.18 

655 

102 

545 

13.5 

16.4 

6.4 

107 

8.0 

18 

23 

44 

18 

18 

150 

20 

865 

21 

11.0 

29.0 

88 

18.0 

13.1 

14.7 

29.3 

22.8 

4.6 

10.3 

3. 2 

1.6 

0.5 

100.0 
Table 2. Chemical analyses of major and trace elements and CIPW norms of samples 

along traverse C-D (fig. 2) across the Tuolumne Intrusive Suite 

[Most elements determined by X -ray fluorescence under the direction of B. W. Chappell at the Australian 

National University. FeO, HzO, and CQz determined by wet chemical methods in the laboratories of 

the U.S. Geological Survey] 

Half Dome Granodiorite 

Equ1granul ar 

Map No. 35 36 37 38 39 40 41 42 43 

Field No. Z-5 Z-23 Z-6 Z-24 Z-25 Z-26 Z-7 Z-27 Z-28 

Chemica 1 analyses (weight percent) 

Si02 ... 69.79 66.93 65.86 68.04 66.12 68.08 64.96 70.07 67.76 

Al203 .. 14.75 15.44 15.68 15.56 15.62 15.33 15.97 14.45 15.61 

Fe203 .. 1.47 1.82 2.13 1.46 1.85 1.56 2.34 1. 28 1.64 

FeO .... 1.07 1. 79 1.65 1. 37 1.93 1.48 1.62 l. 23 1.48 

MgO .... .95 1. 39 1.50 1.10 1.61 1.09 l. ')1 .90 1.14 

CaO .... 2.90 3.65 3.92 3.42 3.80 3. 35 4.16 2. 70 3. 51 

Na20 ... 3.55 3.67 3. 70 3. 75 3.52 3.84 3.87 3.53 3.83 

K20 .... 3. 96 3.63 3. 41 3.61 3. 75 3.69 3. 21 4.20 3.66 

H20+ ... .63 .65 .81 .51 .58 .53 .76 .43 .32 

H20-... .15 .08 .17 .11 .19 .05 .18 .12 .07 

Ti02 ... .34 .50 .52 .40 .55 .45 .60 .37 .46 

P205 ... .11 .17 .18 .13 .17 .15 . 21 .12 .17 

MnO .... .06 .07 .08 .05 .07 .06 .07 .05 .07 

C02 .... .16 .10 .10 .11 .04 .06 .12 .15 .09 

Other .. .19 .22 .25 .22 .24 .20 .27 .15 . 24 

Total 100.08 100.11 99.96 99.84 100.04 99.92 99.85 99.78 100.05 

Trace elements (ppm) 

Ba ..... 625 795 930 830 925 685 985 625 900 

Rb .•... 146 130 114 121 114 136 llO 149 127 

Sr ..... 436 526 578 555 568 510 688 413 572 

Pb ..... 23.0 18.5 18.5 17.0 17.0 21.0 17.0 19.0 20.0 

Th ..... 32.8 28.4 36.0 28.8 9.8 24.2 18.4 24.6 25.4 

u ...... 6.0 8.0 9.4 6.4 4.2 6.6 4.6 7.0 5.8 

Zr ..... 98 117 117 105 114 87 132 86 105 

Nb ..... 7.5 8.5 9.0 8.0 8.0 6.5 8.5 6.5 7.5 

y •••••• 7 11 13 8 11 8 11 6 9 

La ..... 27 25 33 23 25 22 29 17 28 

Ce ..... 39 43 58 36 48 37 53 33 42 

Nd ..... 10 14 19 10 16 ll 19 9 l3 

Sc ..... 4 6 6 4 6 5 6 4 5 

v ...... 40 61 67 46 67 50 77 42 53 

Cr ..... 2 2 3 1 6 5 9 2 8 

Mn .•..• 465 545 590 420 575 460 570 425 505 

Co •.... 6 lO ll 7 10 8 14 7 9 

Ni ..•.. 2.5 2.5 4.5 2.5 3.5 2.5 4.5 2.0 2.5 

Cu ..... 7.0 10.0 7.0 7.0 9.0 7.5 10.5 8.0 6.0 

Zn ..... 50 64 72 49 72 58 76 52 60 

Ga ..... 15.4 17.0 17.0 16.8 17.0 17.4 18.8 16.8 18.2 

CIPW norms (weight percent) 

Q •••••• 27.0 22.4 21.7 24.0 21.3 23.5 20.4 27.0 22.9 

c ...... 

or .•... 23.7 21.7 20.4 21.6 22.4 22.0 19.3 25.1 21.8 

ab ..... 30.4 31.3 31.7 32.1 30.1 32.8 33.2 30.2 32.6 

an ..... 12.7 15.1 16.3 15.1 15.9 13.8 l7 .0 11.3 14.7 

di ..... .8 1.7 1.7 .9 1.6 1.6 2.0 1.2 1.4 

hy ..•.. 2.3 3.8 3. 5 3.1 4.5 2.8 3.1 2.4 2.9 

mt .•..• 2.2 2. 7 3.1 2.1 2. 7 2. 3 3.4 1.9 2.4 

il. .... • 7 1.0 1.0 .8 1.1 .9 1.2 . 7 .9 

ap ..... .3 .4 .4 .3 .4 .4 _._5 .3 .4 

Total 100.1 100.1 99.8 100.0 100.0 100.1 100.1 lOO.l 100.0 

31 
Table 2. Chern ical analyses of major and trace elements and CIPW norms of samples 

along traverse C-D (fig. 2) across the Tuolumne Intrusive Suite-Continued 

Half Dome Granodiorite Cathedral Peak Granodiorite 

Megacrystic 

Sample No. 44 45 46 47 48 49 50 51 52 

Field No. Z-8 Z-29 Z-30 Z-31 Z-32 Z-33 Z-9 Z-34 Z-20 

Chemical analyses (weight percent) 

SiOz ... 66.65 68.12 67.89 67.32 67.48 67.40 68.06 69.33 69.26 

A 12o3 .. 15.73 15.54 15.55 15.66 15.58 15.80 15.59 15.22 15.47 

Fe2o3 .. 1.93 1.55 1. 52 1.69 1.64 1.77 1.19 1.40 1.40 

FeO .... 1. 47 1. 36 1.40 1. 58 1.43 1. 36 l. 21 1. 29 .97 

MgO .... 1.23 1.03 .98 1.10 1.09 1.02 . 90 .85 .73 

CaO .... 3.62 3.15 3.19 3. 59 3. 27 3.45 3.28 3.12 2. 91 

Na2o ... 4.14 3.99 4.02 4.17 3.86 4.08 4.11 4.12 4.26 

KzO .... 3.27 3. 75 3.73 3.22 3.89 3.63 3.56 3.40 3.48 

HzO+ ... .66 .36 .50 .42 .45 . 35 .64 .30 .55 

HzO- ... .12 .20 .10 .08 .15 .11 . 15 .10 .18 

TiOz ... .53 .47 .48 . 55 .50 .53 .46 .45 .39 

Pz05 ... .19 .18 .17 .19 .19 .20 . 18 .17 .16 

MnO .... .07 .06 .06 .06 .06 .06 .06 .06 .05 

COz .... .09 .04 .14 .04 .10 .03 .09 .10 .07 

Other .. . 26 .24 .24 . 25 .27 .27 . 25 . 21 .24 

Total 99.96 100.04 99.97 99.94 99.96 100.06 99.73 100.12 100.12 

Trace elements (parts per million) 

Ba ..... 960 895 905 895 ll50 1015 915 615 825 

Rb ..... 117 128 118 100 106 113 127 126 126 

Sr ..... 633 631 641 709 689 715 668 618 667 

Pb ..... 19.0 19.0 17.0 16.0 17.5 16.5 19.0 18.0 18.5 

Th ..... 16.6 12.2 18.2 12.8 16.0 15.4 17.4 20.0 17.2 

u ...... 5.4 3.2 7.2 3. 6 3.2 5.2 5.2 5.2 4.2 

Zr ..... 126 116 109 121 112 127 127 116 113 

Nb ..... 8.0 7.0 7.0 8.0 7.0 8.0 7.0 6.5 7.0 

y ••.••• 9 8 8 8 7 8 8 7 7 

La ..... 27 23 28 26 24 29 29 22 29 

Ce ..... 49 42 46 46 41 49 47 38 45 

Nd ..... 15 14 14 15 l3 15 16 14 14 

Sc ..... 5 4 4 5 5 5 4 4 3 

v ...... 61 50 48 56 51 54 49 44 36 

Cr ..... 4 1 2 7 1 l l 5 d 

Mn ..... 540 450 445 475 470 490 470 470 425 

Co ..... 10 7 6 8 8 8 7 7 6 

Ni ..... 3.5 2.5 1.5 1.5 2.0 2.0 2.5 2.0 l.O 

Cu ..... 7.5 6.0 5.5 7. 5 6.0 6.5 5.0 6.0 6.0 

Zn ..... 72 67 62 69 64 69 65 62 60 

Ga ..... 20.0 18.6 18.6 19.8 18.8 19.4 20.0 18.8 18.8 

CIPW norms (weight percent) 

Q ...... 21.5 22.9 22.6 22.2 22.3 21.8 23.0 25.1 24.6 

c ...... 

or ..... 19.6 22.3 22.3 19.2 23.2 21.6 21.3 20.2 20.8 

ab ..... 35.4 34.0 34.4 35.6 33.0 34.8 35.3 35.1 36.4 

an ..... 14.9 13.5 13.5 14.7 13.8 14.2 13.8 13.1 12.9 

di ..... 1.6 .8 1.1 1.6 1.0 1.4 1.2 l.l . 5 

hy ..... 2.7 2.7 2.6 2.7 2.8 2.2 2.3 2.2 1.7 mt ..... 2.8 2.3 2.2 2. 5 2.4 2. 6 1.8 2.0 2.0 

il. .... 1.0 . 9 .9 1.1 l.O 1.0 .9 .9 . 7 

ap ..... . 5 .4 .4 . 5 .5 .5 .4 .4 .4 

Total 100.0 99.8 100.0 100.1 100.0 100 .l 100.0 100.1 100.0 

32 
Table 3. Chemical analyses of major and trace elements and CIPW norms of miscellaneous samples from the 

Tuolumne Intrusive Suite not along traverses A-8 and C-D 

[Samples having field numbers prefixed by Z- were analyzed by X-ray fluorescence under the direction of B.W. Chappell at the 

Australian National University. Other samples were analyzed in the laboratories of the U.S. Geological Survey by rapid-rock methods 

or by X-ray fluorescence. FeO, H20, and C~ were determined for all samples in the laboratories of the U.S. Geological Survey by 

wet chemical methods] 

Granodiorite of Half Dome Granodiorite Cathedral Peak Johnson Granite Kuna Crest Equigranular Granodiorite Porphyry 

Map/Field No. Z-15 Z-48 TM-4 Z-17 FD-15 TM-1A TM-1 TM-2 TM-3 TM-6 I-397 Z-65 

Lab. No. D-100207 162505 D-100208 D-102873 D-102874 D-102875 D-102876 1624<)5 

Chemical analyses (weight percent) 

Si02 ... 58.66 66.57 67.18 71.31 71.2 68.46 67.05 66.60 65.89 64.91 74.7 73.39 

A 1203 .. 16.84 15.41 15.51 14.31 14.8 15.77 15.98 16.44 16.39 16.96 13.8 13.83 

Fe203 .. 2.97 1. 75 1.64 1.17 1.3 1. 35 1.62 1.69 2.15 2.00 .93 .70 

FeO .... 3.61 2.15 1.93 .84 .92 1. 31 1.01 1.37 l. 53 1. 82 .52 .48 

MgO .... 3.30 1. 70 1.42 . 74 .48 .90 .60 .96 l. 12 l. 29 .28 .24 

CaO .... 6. 27 3.83 2.88 2. 25 2.5 3.22 3. 71 3.46 3.85 4.41 .92 1. 26 

Na20 ... 3.45 3. 55 3.68 3.64 3.4 4.15 3.80 4.12 4.32 4. 59 3.1 3.68 

K20 .... 2.25 3.48 3. 34 4.10 4.2 3.69 4.16 3. 51 2.91 2.36 5.0 4.90 

H20+ ... 1.11 .62 .46 . 67 .46 .37 .28 .45 .40 .45 .55 .71 

H20- ... .20 .12 .04 . 27 .29 .05 .09 .12 .10 .05 .04 .20 

Ti02 ... .87 . 51 .58 .28 .27 .44 . 66 .52 .61 .63 .14 .16 

P205 ... . 22 . 16 .17 .09 .10 .17 .33 .20 .23 .26 .02 .05 

MnO .... .11 .07 .07 .06 .04 .06 .06 .06 .08 .09 .05 .04 

C02 .... .05 .06 .03 .01 <.05 .02 .01 .01 .02 .01 <.05 .27 

Other .. . 24 .22 . 17 .19 

Cl. .... .01 .00 .00 .00 .01 .00 

F ...... .04 .05 .05 .05 .06 .07 

Less 0. .02 .02 .02 .02 .03 .02 

Total 100.15 100.20 99.96 99.91 100.0 99.99 99.29 99.54 99.64 99.87 100.1 100.10 

Trace elements (parts per mill ion 

Ba ..... 615 840 520 800 

Rb ..... 101 122 178 229 

Sr ..... 592 487 360 249 

Pb ..... 14.0 15.0 26.5 31.0 

Th ..... 17.6 27.2 28.4 21.8 

u •..... 5. 2 6.2 7.4 5.4 

Zr ..... 110 99 91 1 18 

Nb ..... 7.0 8.5 8.5 10.5 

y .••••. 17 12 8 14 

La ..... 28 29 21 29 

Ce ..... 51 48 34 60 

Nd ..... 19 15 9 17 

Sc ..... 17 8 3 3 

v ...... 161 64 32 6 

Cr ..... 20 2 2 <1 

Mn ..... 885 565 475 310 

Co ..... 23 11 5 1 

Ni ..... 12.5 2.5 2.5 <.5 

Cu ..... 43.5 8.0 4.0 2.0 

Zn ..... 98 60 50 32 

Ga ..... 19.4 17.4 17.2 17.2 

CIPW norms (weight percent) 

Q •••••• 12.3 22.1 25.0 29.0 29.7 22.5 21.8 21.0 20.6 18.6 35.4 30.6 

c ...... 1.0 .4 .1 1.7 . 3 

or ..... 13.5 20.7 20.1 24.5 25.0 21.9 24.8 21.0 17.4 14.0 29.7 29.3 

ab ..... 29.6 30.3 31.6 31.2 29.0 35.3 32.2 35.2 36.9 39.1 26.4 31.5 

an ..... 24.2 16.0 13.4 10.7 11.8 13.6 14.4 16.0 16.9 18.8 4.5 fi.O 

di ..... 4.8 1.7 1.1 1.6 . 7 1.2 

hy ..... 9.0 5.2 5.0 2.0 1.5 2.4 .8 2.8 2.7 3.5 .8 . 7 

mt ..... 4.4 2.6 2.4 1.7 1.9 2.0 1.6 2.5 3.1 2. 9 1.4 1.0 

il ..... 1.7 1.0 1.1 • 5 .5 .8 1.3 1.0 1.2 1.2 . 3 . 3 

ap ..... . 5 .4 .4 . 2 . 2 .4 .8 . 5 .6 . 1 .4 . 1 

hm ....• .6 

Total 100.0 100.0 100.0 99.9 100.0 100.0 100.2 100.1 100.1 99.9 100.2 99.8 

33 
Table 4. Mode, color index, and specific gravity of plutonic rocks along traverse A-8 (fig. 2) 

across the Tuolumne Intrusive Suite 

Modes (volume percent) Map Field Color Specific number number Quartz Plagio- Alkali Biotite Horn- index gravity 

clase feldspar blende 

Tonaiite of Glen Aulin 

0 Z-64 3 60 2 12 21 35 2.83 

1 Z-51 13 50 8 13 16 30 2.80 

2 Z-52 12 55 3 12 16 30 2.80 

3 Z-53 18 48 11 11 11 23 2.76 

Equ1granular Half Dome Granodiorite 

4 Z-54 20 43 16 II (west~ 

8 21 2.74 

5 Z-55 23 43 21 6 7 15 2.70 

6 Z-56 24 40 23 6 5 13 2.70 

7 Z-57 24 45 17 9 4 14 2. 71 

8 Z-58 25 43 22 6 3 10 2.69 

9 Z-59 26 40 24 6 3 10 2.69 

10 Z-60 25 44 23 4 2 8 2.67 

Megacrystic Ra1f Dome Granoa1or1te (west) 

11 Z-61 23 44 25 6 2 9 2.67 

12 Z-62 25 45 22 5 2 9 2.68 

Lathearal Peak Granoa1or1te (west) 

13 Z-63 26 47 21 3 2 6 2.66 

14 Z-35 24 49 20 4 1 7 2.67 

15 Z-10 23 48 23 4 1 6 2.67 

16 Z-36 27 44 24 3 tr 5 2.65 

17 Z-11 26 48 21 4 tr 6 2.66 

18 Z-37 26 51 18 4 tr 6 2.65 

19 Z-38 28 44 24 3 tr 4 2.63 

Johnson Granite Porphyry 

20 Z-39 29 35 34 2 0 2 2.61 

21 Z-18 28 41 29 2 0 2 2.63 

22 Z-19 33 26 40 1 0 1 2.61 

Lathedral Peak Granoa1or1te (east) 

23 Z-12 30 41 28 1 0 2 2.61 

24 Z-40 25 47 23 4 tr 5 2.65 

25 Z-13 27 45 23 3 tr 5 2.66 

26 Z-14 26 48 21 4 1 6 2.66 

27 Z-41 26 52 15 3 2 7 2.67 

28 Z-42 ~egacryst1c Half Dome Granoaiorite 

22 47 21 5 

(east) 

3 10 2.68 

29 Z-43 tquigranu1ar Ra1r Dome Granoa1or1te 

25 46 17 7 

(east) 

4 12 2.11 

30 Z-16 29 40 24 5 2 8 2.68 

31 Z-44 20 45 18 10 7 18 2.73 

Granoa1or1te of Kuna Crest 

32 Z-45 22 44 15 10 8 19 2.73 

33 Z-46 21 47 13 12 7 20 2.76 

34 Z-47 14 51 9 12 13 26 2.78 

34 
Table 5. Mode, color index, and specific gravity of plutonic rocks along traverse C-D (fig. 2) 

across part of the western flank of the Tuolumne Intrusive Suite 

Map Field Modes (volume percent) Color Specific 

number number index gravity 

Quartz Plag1o- Alkali Biotite Hornclase feldspar blende 

35 Z-5 27 

Eguigranuiar Half Oome Granoa1or1te 

41 25 4 1 7 2.66 

36 Z-23 25 43 21 6 3 11 2.69 

37 Z-6 24 44 21 8 2 11 2.71 

38 Z-24 26 43 22 5 3 10 2.67 

39 Z-25 22 45 21 5 5 12 2.70 

40 Z-26 23 45 22 3 1 10 2.68 

41 Z-7 20 49 17 7 4 13 2.71 

42 Z-27 28 39 27 4 1 7 2.66 

43 Z-28 25 45 21 4 3 9 2.68 

~egacryst1c Half Dome Granodiorite 

44 Z-8 24 45 21 5 3 10 2.70 

45 Z-29 24 45 23 6 1 8 2.66 

46 Z-30 24 45 24 5 2 7 2.67 

47 Z-31 23 51 16 5 2 9 2.70 

48 Z-32 23 47 22 4 2 8 2.65 

Cathedral Peak Granoa1or1te 

49 Z-33 25 47 22 4 2 7 2.67 

50 Z-9 24 47 21 4 2 8 2.66 

51 Z-34 25 46 23 4 1 6 2.67 

52 Z-20 24 48 21 5 1 7 2.67 

35 
Table 6. Mode, color index, and specific gravity of plutonic rocks of the Tuolumne 

Intrusive Suite not along traverses A-B or C-D 

Modes (volume percent) Field/map Color Specific 

number Quartz Plagio- Alkali Biotite Horn- index gravity 

clase feldspar blende 

~ 

Equigranular Half Dome Granod1or1te 

23 41 31 3 1 5 2.65 

K-2-74 21 55 10 6 9 14 2. 71 

K-11-74 27 41 25 5 1 7 2.66 

K-30-74 20 48 15 9 8 17 2.73 

K-15-75 15 55 10 10 7 20 2.75 

K-31-75 25 46 18 6 3 11 2.55 

k-33-75 23 48 18 8 2 11 2.68 

K-34-75 19 53 16 7 3 11 2.71 

K-39-75 23 50 14 6 4 12 2.69 

TMa-5 19 58 9 15 2.74 

TMa-7 25 49 16 11 2.71 

TMa-8 22 54 9 15 2.74 

TMa-ll 25 46 18 9 2 12 2. 71 

TMa-14 27 42 21 7 4 11 2. 71 

TMa-15 20 49 16 12 2 15 2.73 

TMa-23 20 52 13 9 4 15 2.73 

TMa-27 27 42 23 4 5 8 2.68 

TMa-60 16 57 10 11 5 18 2.76 

TMb-1 23 47 18 7 3 11 2.69 

TMb-104 22 48 14 7 10 17 2.74 

TMb-162 19 51 18 7 4 11 2.71 

TMc-44 21 48 22 5 4 11 2.68 

TMc-107 23 43 26 6 1 9 2.67 

TMc-111 25 42 25 5 2 8 2.69 

TMc-114 31 43 13 8 4 14 2.70 

TMc-115 28 52 10 5 3 11 2.69 

TMc-116 35 43 11 7 3 11 2.67 

TMc-117 31 45 12 5 5 12 2.69 

TMc-123 26 37 32 1 1 5 2.64 

TMc-172 25 44 18 10 2 13 2.69 

TMc-175 25 45 19 8 1 11 2.65 

TMc-176 23 48 20 9 2.68 

TMc-177 40 44 7 8 2.66 

TMc-178 29 42 23 6 2.64 

TMc-179 25 46 21 9 2.67 

TMd-91 25 46 19 4 3 10 2.68 

TMd-101 26 46 21 3 3 8 2.67 

TMd-103 26 41 24 5 3 9 2.65 

TMd-107 27 42 21 5 4 10 2.68 

TMd-108 30 39 23 4 2 8 2.65 

TMd-119 30 37 23 6 4 10 2.67 

TMd-123 35 45 11 7 0 9 2.70 

TMd-172 26 44 19 7 2 11 2.67 

TMd-174 27 47 16 8 3 11 2.69 

TMd-176 26 39 27 5 3 7 2.65 

Megacrystic Half Dome Granodiorite 

TMo-159 22 49 18 7 3 11 2.68 

TMc-5 22 51 18 5 3 9 2.67 

TMc-6 23 48 20 3 6 10 2.67 

TMc-7 24 50 17 9 3 4 2.67 

TMc-13 22 47 19 3 7 11 2.68 

TMc-15 24 41 24 8 1 9 2.66 

mc-17 23 53 14 3 3 10 2.67 

TMc-19 24 49 19 3 5 8 2.68 

TMc-20 28 46 18 3 4 9 2.68 

TMc-23 27 42 24 3 1 7 2.66 

TMc-24 26 44 21 4 3 10 2.67 

TMc-31 21 51 17 3 6 11 2.67 

TMc-32 26 38 24 7 4 12 2.67 

TMc-33 22 43 20 6 3 10 2.68 

TMc-34 19 48 20 3 6 12 2.68 

TMc-35 23 44 23 6 4 11 2.69 

TMc-40 24 44 22 6 4 10 2.67 

TMc-41 24 47 21 4 4 8 2.65 

TMc-42 27 47 20 3 4 6 2.66 

TMc-43 26 46 19 7 1 9 2.66 

TMc-45 24 48 18 5 3 10 2.70 

TMc-46 25 45 20 6 4 10 2.68 

TMc-47 23 46 21 5 2 9 2.68 

36 
Table 6. Mode, color index, and specific gravity of plutonic rocks of the Tuolumne 

Intrusive Suite not along traverses A-B or C-O-Continued 

Modes (volume percent) Field/map Color Specific number Quartz Plag1o- Alkah Biotite Horn- index gravity clase feldspar blende 

Megacrystic Half Dome Granodiorite (contin~ed) 

TMc-110 28 47 18 3 3 8 2.68 

TMc-112 27 20 46 4 2 7 2.67 

TMc-119 23 48 24 1 1 4 2.65 

TMc-121 20 46 27 3 2 8 2.66 

TMc-151 38 42 10 11 2.67 

TMc-152 26 36 33 5 tr 7 2.66 

TMd-1 30 43 20 5 1 7 2.64 

TMd-1A 20 47 24 4 2 8 2.68 

TMd-5A 21 55 16 a 1 8 2.67 

TMd-6 25 53 14 5 2 8 2.65 

TMd-7 21 50 22 3 3 7 2.67 

TMd-14B 23 48 18 4 4 10 2.67 

TMd-16 24 49 17 4 4 10 2.66 

TMd-20 25 44 21 2 4 10 2.68 

TMd-43 23 47 22 4 1 8 2.66 

TMd-48 23 51 25 6 2 8 2.67 

TMd-49 26 48 18 4 3 8 2.67 

TMd-54 25 51 17 5 2 8 2.69 

TMd-56 22 35 36 4 3 7 2.66 

TMd-57 22 43 28 4 4 8 2.67 

TMd-88 24 42 34 2 7 10 2.67 

TMd-115 23 51 16 11 2.71 

TMd-116 30 43 18 6 2 9 2.67 

TMd-117 23 54 11 7 3 11 2.68 

TMd-124 31 39 20 6 2 10 2. 71 

Catfieara 1 Peak Granodiorite 

K-l-74 27 39 28 3 1 5 2.65 

K-18-75 22 51 21 4 1 6 2.66 

K-19-75 22 49 25 4 0 4 2.60 

K-20-75 25 39 32 4 0 4 2.64 

K-21-75 26 44 26 4 0 5 2.63 

K-22-75 27 47 22 4 0 4 2.61 

k-23-75 27 43 26 3 0 4 2.64 

K-24-75 30 42 26 2 0 2 2.61 

K-25-75 26 41 29 3 0 4 2.64 

K-26-75 29 42 26 3 0 3 2.65 

K-27-75 30 32 37 1 0 2 2.61 

K-28-75 29 42 26 3 0 4 2.63 

K-29-7 5 22 51 18 3 3 8 2.67 

K-30-75 23 46 25 5 1 7 2.67 

K-32-75 27 55 10 5 2 8 2.68 

K-35-75 21 53 17 4 4 9 2.67 

K-36-75 29 46 16 4 1 6 2.66 

K-38-75 2"i 49 18 4 2 8 2.68 

K-40-75 24 39 33 1 3 5 2.64 

K-41-75 21 48 25 4 2 6 2.66 

K-42-75 21 48 24 6 1 8 2.67 

K-43-75 27 48 21 3 0 5 2.63 

K-44-75 28 47 20 5 0 6 2.64 

K-45-75 28 45 23 3 0 4 2.63 

K-46-75 26 47 22 3 0 4 2.64 

K-47-75 27 46 22 3 0 5 2.63 

K-43-75 2!1 41 24 4 tr 6 2.63 

K-49-75 27 43 25 3 0 4 2.63 

K-50-75 29 40 27 4 0 4 2.62 

K-51-75 26 40 29 4 tr 5 2.65 

K-52-75 28 33 36 3 0 3 2.62 

K-53-75 27 43 25 5 0 6 2.64 

K-55-75 27 42 26 3 0 4 2.62 

K-56-75 26 43 26 2 0 4 2.62 

K-57-75 27 39 29 3 0 4 2.63 

K-58-75 29 42 25 4 0 4 2.63 

TMa-2 21 40 31 7 2.66 

TMa-9 23 51 17 9 2.69 

TMa-10 26 60 14 5 1 8 2.69 

Tma-24 23 47 25 3 2 6 2.67 

TMa-28 29 55 16 3 3 6 2.67 

TMa-29 23 40 34 3 tr 4 2.66 

37 
Table 6. Mode, color index, and specific gravity of plutonic rocks of the Tuolumne 

Intrusive Suite not along traverses A-8 or C-O-Continued 

Modes {volume percent) 

Field/map Color Specific 

number "QUartZ Plag10- A 1 ka l i Biotite Horn- index gravity 

clase feldspar blende 

Cathedral Peak Granodiorite (continued) 

TMa-33 28 43 26 3 0 3 2.64 

TMa-34 33 34 32 1 0 1 2.62 

TMa-50 25 50 29 4 tr 6 2.66 

TMa-51 30 44 21 4 tr 5 2.64 

TMa-52 28 46 22 4 0 4 2.63 

TMa-54 21 49 21 6 2 9 2.68 

TMa-55 27 55 13 4 1 6 2.67 

TMa-56 23 46 26 3 tr 5 2.66 

TMa-57 22 53 18 6 tr I 2.68 

TMa-58 27 47 20 5 tr 6 2.65 

TMa-59 23 53 17 5 1 7 2.66 

TMa-103 25 47 22 4 1 6 2.64 

TMb-4 31 46 20 3 0 3 2.62 

TMb-152 24 44 29 3 tr 4 2.65 

TMb-153 32 42 22 3 0 4 2.63 

TMb-154 29 45 24 2 0 2 2.64 

TMb-155 26 46 23 3 tr 4 2.64 

TMb-157 24 49 22 4 tr 5 2.63 

TMb-158 26 46 22 5 tr 6 2.64 

TMb-160 20 39 35 5 1 6 2.64 

TMb-161 23 49 23 3 1 5 2.65 

TMb-164 19 43 31 8 2.65 

TMc-8 22 43 29 3 1 5 2.66 

TMc-9 24 43 27 2 2 6 2.66 

TMc-10 27 50 17 3 1 7 2.67 

TMc-11 21 45 27 4 2 8 2.67 

TMc-12 27 47 20 5 1 6 2.66 

TMc-14 24 45 23 4 2 8 2.66 

TMc-16 27 49 17 4 2 7 2.66 

TMc-25 25 54 12 4 3 9 2.66 

TMc-26 22 43 27 6 1 8 2.66 

TMc-27 25 45 23 6 1 8 2.66 

TMc-28 23 48 22 3 2 7 2.66 

TMc-29 22 47 25 4 1 6 2.65 

TMc-30 22 50 21 6 tr 8 2.66 

TMc-48 21 52 17 5 3 11 2.69 

TMc-49 20 44 29 2 2 7 2.66 

TMc-50 26 54 11 5 1 9 2.66 

TMc-51 24 49 18 5 3 9 2.68 

TMc-52 26 46 22 3 tr 4 2.66 

TMc-53 21 53 16 7 2 10 2.67 

TMc-54 24 46 23 3 2 7 2.67 

TMc-55 21 51 22 4 1 6 2.66 

TMc-56 27 50 16 5 1 7 2.65 

TMc-118 30 42 20 8 2.66 

TMc-120 23 46 23 6 2 9 2.67 

TMc-153 22 51 21 5 2.65 

TMc-154 29 48 19 5 2.66 

TMc-155 27 48 20 4 tr 5 2.65 

TMc-156 30 45 26 6 2.64 

TMc-157 21 57 16 3 6 2.65 

TMc-158 21 49 25 6 2.66 

TMc-159 27 43 25 3 6 2.64 

TMc-150 32 44 19 5 2.65 

TMc-161 23 49 22 6 2.65 

TMc-162 26 49 21 3 tr 4 2.63 

TMc-163 27 42 27 4 tr 4 2.64 

TMc-164 26 48 21 4 tr 6 2.63 

TMc-165 29 44 22 4 1 6 2.66 

TMc-166 27 45 23 4 tr 5 2.65 

TMc-167 25 47 20 5 3 8 2.66 

TMc-168 33 47 17 3 tr 4 2.63 

TMc-169 25 43 28 5 0 5 2.64 

TMc-170 27 45 24 4 0 4 2.64 

38 
Table 6. Mode, color index, and specific gravity of plutonic rocks of the Tuolumne 

Intrusive Suite not along traverses A-8 or C-O-Continued 

Modes (volume percent) Color Spec1 he 

Field/map Index Gravity number Quartz Plagio- A lkal1 B10t1te Hornclase feldspar blende 

TMd-2 26 48 

Cathedral Peak Granodiorite (continued} 

18 6 2 8 2.66 

TMd-3 30 46 16 5 2 8 2.66 

TMd-2A 21 44 29 4 1 6 2.68 

TMd-17 24 49 21 3 2 6 2.66 

TMd-18 21 44 28 4 1 7 2.67 

TMd-21 25 53 14 4 2 8 2.68 

TMd-22 29 52 12 6 tr 7 2.66 

TMd-23 23 57 9 5 2 11 2.65 

TMd-24 28 48 17 4 1 7 2.66 

TMd-28 27 49 17 6 tr 8 2.66 

TMd-29 29 47 19 4 tr 6 2.65 

TMd-30 23 50 19 5 1 8 2.66 

TMd-31 21 54 18 2 1 6 2.66 

TMd-32 32 42 23 3 tr 3 2.62 

TMd-33 24 47 24 4 tr 5 2.64 

TMd-39 26 46 23 3 1 5 2.66 

TMd-42A 26 49 20 3 1 5 2.65 

TMd-428 27 57 8 6 0 8 2.67 

TMd-47 22 43 29 3 2 7 2.66 

TMd-50 23 38 33 2 1 5 2.66 

TMd-51 27 53 16 3 tr 4 2.65 

TMd-52 24 42 27 4 3 7 2.67 

TMd-53 30 51 14 4 0 5 2.65 

TMd-158 24 48 21 5 tr 7 2.66 

TMd-159 26 49 20 3 0 5 2.64 

TMd-161 22 46 28 3 1 5 2.63 

TMd-162 30 48 18 2 tr 3 2.63 

TMd-164 26 45 22 5 0 7 2.64 

TMd-165 29 47 21 3 0 3 2.61 

TMd-166 27 42 26 3 0 3 2.63 

TMci-167 28 41 24 5 tr 7 2.65 

TMd-168 31 44 20 4 1 5 2.63 

TMd-169 27 41 29 1 1 3 2.63 

TMd-169 25 46 23 5 tr 7 2.63 

TMd-171 25 46 23 6 tr 7 2.63 

Johnson Granite Porphyry 

Z-65 22 34 42 1 0 2 2.60 

TMb-151 28 34 36 2 2.58 

TMc-171 18 37 43 2 2.61 

TMd-40 22 48 27 3 2.63 

TMd-45 31 30 38 1 2.60 

TMd-46 33 24 43 1 2.58 

TMd-151 17 27 55 1 2.62 

TMd-152 23 31 45 1 2.61 

TMd-153 19 32 48 2 2.59 

TMd-154 16 31 53 1 2.62 

TMd-155 32 26 41 1 2.57 

TMd-156 24 31 44 1 2.56 

TMd-163 25 37 38 1 2.58 

39 
Table 7. Mode, color index, and specific gravity of plutonic rock samples predating the 

Tuolumne Intrusive Suite 

Modes (volume percent) 

Field/map Color Specific 

number Quartz Plagio- Alkali Biotite Horn- index gravity 

clase feldspar blende 

Granodior1te of Yosemite Creek 

K-7-75 17 66 4 13 2.69 

K-12-75 8 72 1 19 2.75 

Granodior1te north of Tuolumne Peak 

K-24-74 35 31 31 4 0 4 2.621 

Leuco9ran1te of Ten [aK"es 

TMa-19 37 34 27 3 0 4 2.64 

TMa-30 37 29 33 1 0 2 2.62 

TMa-31 18 51 17 14 2. 71 

TMa-32 33 33 32 1 0 2 2.63 

f'.-16-74 28 43 27 2 0 2 2.64 

k.-17-74 30 29 36 4 0 4 2.64 

K-22-74 35 17 48 1 0 1 2.62 

K-1-75 30 35 29 6 0 6 2.65 

K-2-75 29 38 30 4 0 4 2.62 

K-3-75 34 35 29 2 0 2 2.63 

K-5-75 33 37 29 1 0 1 2.62 

K-6-75 32 30 35 3 0 3 2.62 

K-8-75 34 31 33 2 0 2 2.61 

K-11-75 32 29 37 2 0 2 2.62 

K-13-75 33 28 34 3 0 3 2.62 

Granodiorite of Mount Hoffman 

TMa-13 34 39 23 4 0 5 2.64 

TMa-22 35 33 29 3 0 3 2.64 

TMc-101 29 42 23 6 tr 6 2.64 

TMc-103 32 34 31 3 0 3 2.63 

TMc-104 32 37 23 7 2 9 2.67 

TMc-105 3S 33 25 6 2 8 2.65 

K-6-74 29 37 29 5 0 6 2.66 

K-9-74 32 29 38 1 0 1 2.62 

K-20-74 35 33 27 4 0 5 2.65 

K-25-74 31 34 30 4 0 5 2.65 

K-27-74 32 34 29 4 0 4 2.64 

K-32-74 34 35 30 2 0 2 2.62 

K-33-74 26 40 22 11 1 12 2.66 

K-4-75 32 38 23 7 0 7 2.63 

K-16-75 31 33 32 3 0 3 2.62 

K-17-75 33 30 35 2 0 2 2.58 

Granite of Turner Lake 

TMd-19 33 37 24 6 0 7 2.64 

TMd-58 28 35 31 5 1 6 2.65 

TMd-59 29 37 29 4 2.65 

TMd-87 32 33 29 6 0 6 2.64 

40 
Table 7. Mode, color index, and specific gravity of plutonic rock samples predating the 

Tuolumne Intrusive Suite-Continued 

Map Modes (volume percent) Color Spec1f1c Number Index Gravity 

Quartz Plagio- Alkali- B10t1te Hornclase feldspar blende 

Granodiorite of Red Devil Lake 

TMd-35 28 32 36 4 tr 4 2.64 

TMd-55 27 46 18 6 3 9 2.70 

TMd-60 28 41 23 7 tr 7 2.66 

TMd-63 23 50 16 10 1 12 2.69 

TMd-64 23 43 24 6 2 9 2.68 

TMd-68 25 49 17 7 1 10 2.68 

TMd-76 24 49 15 6 4 12 2.69 

TMd-77 27 49 12 12 tr 13 2.70 

TMd-78 25 49 19 ~ 2 7 2.69 

TMd-79 26 43 20 8 1 11 2.68 

TMd-84 28 38 25 8 0 9 2.65 

TMd-85 28 40 21 8 1 11 2.64 

TMd-86 27 42 20 10 tr 11 2.66 

Granite of Ireland Lake 

IMd-11 26 43 26 4 tr 5 2.64 

TMd-13 22 37 36 0 4 5 2.63 

IMd-61 26 38 

Leucogran1te or Gall1son [aKe 

34 1 0 2 2.62 

TMd-62 13 38 45 2 0 3 2.63 

Quartz alOrlte 

IMa-20 I 72 tr 3 17 21 2.85 

TMd-38 13 67 8 8 3 13 2.75 

TMd-66 10 63 10 11 5 18 2.74 

TMd-75 9 70 3 8 9 18 2.73 

TMd-80 4 78 1 4 11 18 2.79 

Me i agr ani te 

TMb-9 16 28 30 8 17 26 2.70 

TMb-188 16 36 35 14 2. 71 

41 
Table 8. Isotopic data for oxygen, rubidium, and strontium from samples projected on traverse 

A-B (fig. 2) across the Tuolumne Intrusive Suite 

Map Field Rb Sr Rb/Sr 87Rbf86Sr 87Srf86Sr 87Srf86 Sr o18o 

number number (ppm) (ppm) 87 Ma 

0 Z-64 88 616 0.143 0.413 0.70650 o. 7060 

I Z-51 108 574 .188 .544 .70656 .7059 

2 Z-52 102 551 .185 .535 .70635 .7057 

.70645 .7058 

.70642 .7058 

3 Z-53 140 507 .276 .799 .70693 • 7059 7.7 

.70695 .7060 

.70687 .7059 

4 Z-54 134 478 .280 .811 .70678 .7058 7.7 

.70680 .7058 

.70667 .7057 

5 Z-55 138 451 .306 .885 • 7072 3 .7061 7.9 

6 Z-56 127 412 . 308 .892 .70719 .7061 

Z-57 114 509 .224 .648 .70692 .7061 8.0 

R Z-58 141 462 . 305 .883 .70744 .7063 8.3 

.70759 .7065 . 70728 .7062 

9 Z-59 153 397 .485 1.115 .70769 . 7063 

10 Z-60 138 491 .281 .813 .70733 .7063 

11 Z-61 129 658 .196 .567 .70707 .7064 . 70713 • 7064 • 70717 .7064 

12 Z-62 104 701 .148 .429 .70695 .7064 

13 Z-63 135 582 .232 .671 .70729 .7065 

14 Z-35 129 710 .182 .526 .70690 .7063 

. 70725 .7066 • 70710 .7065 

15 Z-10 134 663 .202 .585 .70700 .7063 8.3 • 70709 .7064 . 70717 .7065 

16 Z-36 127 641 .198 .573 .70701 • 7063 

17 Z-11 137 621 .221 .638 . 70716 .7064 

18 Z-37 132 585 .226 .653 . 70712 .7063 

19 Z-38 165 525 .314 .909 .70765 .7065 

20 Z-39 189 277 .682 1.975 .70907 .7066 

21 Z-18 158 484 . 326 .944 • 70776 .7066 

22 Z-19 207 301 .688 1.990 .70906 .7066 

23 Z-12 150 369 .407 1.176 .70786 .7064 

.70791 .7064 

24 Z-40 143 628 .228 .659 • 70718 .7064 

.70707 .7063 

25 Z-13 131 609 .215 .622 • 70710 .7063 

26 Z-14 133 648 .205 .594 • 70717 .7064 

.70694 .7062 

.70707 .7063 

27 Z-41 107 695 .154 .445 .70704 .7065 

28 Z-42 114 699 .163 .472 .70691 .7063 

.70703 .7064 

.70697 .7064 

29 Z-43 107 579 .185 .535 .70673 • 7061 

.70685 .7062 

.70679 .7061 

30 Z-16 163 380 .429 1.241 .70760 . 7061 

31 Z-44 123 515 .239 .691 .70683 .7060 8.1 

32 Z-45 113 563 .201 .581 .70678 .7061 

33 Z-46 119 482 • 247 .714 .70679 • 7059 

34 Z-47 102 545 .187 .541 .70663 .7060 

.70646 .7058 

42 
Table 9. Isotopic data for oxygen, rubidium, and strontium from samples along traverse C-D (fig. 

2) across part of the western flank of the Tuolumne Intrusive Suite 

Map Field Rb Sr Rb/Sr 87Rbf86sr 87srf86sr 87Srf86sr 618o 

number number (ppm) (ppm) 87 Ma 

35 Z-5 146 436 0.335 0.969 0.70749 0.7063 8.2 

.70740 • 7062 

36 Z-23 30 526 .247 .715 .70701 .7061 7.9 • 70713 • 7062 

37 Z-6 114 578 .197 .571 .706920 .7062 

38 Z-24 121 555 .218 .631 • 707070 .7063 

39 Z-25 114 568 .201 .581 .706960 .7062 

40 Z-26 136 510 .267 .771 .70736 .7064 • 70712 .7062 • 70717 .7062 

41 Z-7 110 688 .160 .463 .70682 .7062 

42 Z-27 149 413 • 361 .044 .70757 .7063 

43 Z-28 127 572 .222 .642 • 70714 .7063 

44 Z-8 117 633 .185 .535 • 70704 • 7064 

.70688 .7062 

45 Z-29 28 631 .203 .587 • 70726 .7065 

46 Z-30 18 641 .184 .533 • 70709 .7064 

47 Z-31 100 709 .141 .408 .70698 • 7065 

48 Z-32 106 689 .154 .445 • 70699 .7064 

49 Z-23 113 712 .158 .457 .70709 .7065 

50 Z-9 127 668 .190 .550 • 70710 .7064 

51 Z-34 128 618 .207 .599 • 70713 .7064 

52 Z-20 126 667 .189 .547 • 70714 .7065 

43 
GPO 585-045/9759 
SELECTED SERIES OF U.S. GEOLOGICAL SURVEY PUBLICATIONS 

Periodicals 

Earthquakes & Volcanoes (issued bimonthly). 

Preliminary Determination of Epicenters (issued monthly). 

Technical Books and Reports 

Professional Papers are mainly comprehensive scientific reports of 

wide and lasting interest and importance to professional scientists and engineers. Included are reports on the results of resource studies and of 

topographic, hydrologic, and geologic investigations. They also include 

collections of related papers addressing different aspects of a single scientific topic. 

Bulletins contain significant data and interpretations that are of lasting scientific interest but are generally more limited in scope or 

geographic coverage than Professional Papers. They include the results 

of resource studies and of geologic and topographic investigations; as well 

as collections of short papers related to a specific topic. 

Water-Supply Papers are comprehensive reports that present significant interpretive results of hydrologic investigations of wide interest 

to professional geologists, hydrologists, and engineers. The series covers 

investigations in all phases of hydrology, including hydrogeology, 

availability of water, quality of water, and use of water. 

CIJ'culars present administrative information or important scientific 

information of wide popular interest in a format designed for distribution 

at no cost to the public. Information is usually of short-term interest. 

Water-Resources Investigations Reports are papers of an interpretive nature made available to the public outside the formal USGS publications series. Copies are reproduced on request unlike formal USGS 

publications, and they are also available for public inspection at 

depositories indicated in USGS catalogs. 

Open-File Reports include unpublished manuscript reports, maps, 

and other material that are made available for public consultation at 

depositories. They are a nonpermanent form of publication that may be 

cited in other publications as sources of information. 

Maps 

Geologic Quadrangle Maps are multicolor geologic maps on 

topographic bases in 71/2- or 15-minute quadrangle formats (scales mainly 1:24,000 or 1 :62,500) showing bedrock. surficial, or engineering geology. Maps generally include brief texts; some maps include structure 

and columnar sections only. 

Geophysical Investigations Maps are on topographic or planimetric 

bases at various scales; they show results of surveys using geophysical 

techniques, such as gravity, magnetic, seismic, or radioactivity, which 

reflect subsurface structures that are of economic or geologic significance. 

Many maps include correlations with the geology. 

Miscellaneous Investigations Series Maps are on planimetric or 

topographic bases of regular and irregular areas at various scales; they 

present a wide variety of format and subject matter. The series also includes 7 1/2-minute quadrangle photo geologic maps on planimetric bases 

which show geology as interpreted from aerial photographs. Series also 

includes maps of Mars and the Moon. 

Coal Investigations Maps are geologic maps on topographic or 

planimetric bases at various scales showing bedrock or surficial geology, stratigraphy, and structural relations in certain coal-resource areas. 

Oil and Gas Investigations Charts show stratigraphic information 

for certain oil and gas fields and other areas having petroleum potential. 

Miscellaneous Field Studies Maps are multicolor or black-andwhite maps on topographic or planimetric bases on quadrangle or irregular areas at various scales. Pre-1971 maps show bedrock geology 

in relation to specific mining or mineral-deposit problems; post-1971 

maps are primarily black-and-white maps on various subjects such as 

environmental studies or wilderness mineral investigations. 

Hydrologic Investigations Atlases are multicolored or black-andwhite maps on topographic or planimetri'- bases presenting a wide range 

of geohydrologic data of both regular and irregular areas; principal scale 

is 1:24,000 and regional studies are at 1:250,000 scale or smaller. 

Catalogs 

Permanent catalogs, as well as some others, giving comprehensive listings of U.S. Geological Survey publications are available under 

the conditions indicated below from the U.S. Geological Survey, Books 

and Open-File Reports Section, Federal Center, Box 25425, Denver, 

CO 80225. (See latest Price and Availability List) 

"Publications of the Geological Survey, 1879-1961" may be purchased by mail and over the counter in paperback book form and as a 

set of microfiche. 

"Publications of the Geological Survey, 1962-1970" may be purchased by mail and over the counter in paperback book form and as a 

set of microfiche. 

"Publications of the U.S. Geological Survey, 1971-1981" may be 

purchased by mail and over the counter in paperback book form (two 

volumes, publications listing and index) and as a set of microfiche. 

Supplements for 1982, 1983, 1984, 1985,1986, and for subsequent 

years since the last permanent catalog may be purchased by mail and 

over the counter in paperback book form. 

State catalogs, "List of U.S. Geological Survey Geologic and 

Water-Supply Reports and Maps For (State)," may be purchased by mail ' 

and over the counter in paperback booklet form only. 

"Price and Availability List of U.S. Geological Survey Publications," issued annually, is available free of charge in paperback booklet fonn only. 

Selected copies of a monthly catalog "New Publications of the U.S. 

Geological Survey" available free of charge by mail or may be obtained 

over the counter in paperback booklet form only. Those wishing a free 

subscription to the monthly catalog "New Publications of the U.S. 

Geological Survey" should write to the U.S. Geological Survey, 582 

National Center, Reston, VA 22092. 

Note.--Prices of Government publications listed in older catalogs, 

announcements, and publications may be incorrect Therefore, the 

prices charged may differ from the prices in catalogs, announcements, 

and publications.