Shaver Lake Quadrangle, 

Central Sierra Nevada, 

California Analytic Data

GEOLOGICAL SURVEY PROFESSIONAL PAPER 774-D
Shaver Lake Quadrangle, 

Central Sierra Nevada, 

California Analytic Data

By PAUL C. BATEMAN and JOHN P. LOCKWOOD

SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

GEOLOGICAL SURVEY PROFESSIONAL PAPER 774-D

Chemical, semiquantitative spectrographic, 

and modal analyses and potassium-argon and 

uranium-lead age determinations on granitic 

and volcanic rocks supplement Geologic 

Quadrangle Map (GQ-1271)

UNITED STATES GOVERNMENT PRINTING OFFICE , WASH IN GTON : 1 976
UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY 

V. E. McKelvey, Director

Library of Congress Cataloging in Publication Data

Bateman, Paul Charles, 1910-

Shaver Lake quadrangle, central Sierra Nevada, California-analytic data. (Shorter contributions to general geology)

(Geological Survey Professional Paper 774-D)

Bibliography: p. 3.

Supt. of Doc. No.: I 19.16:774-D.

1. Granite-California-Shaver Lake region-Analysis. 2. Volcanic ash, tuff, etc.-California-Shaver Lake regionAnalysis. 3. Radioactive dating. I. Lockwood, John P., joint author. II. Title. III. Series: United States. 

Geological Survey. Shorter contributions to general geology. IV. Series: United States. Geological Survey 

Professional Paper 774-D.

QE462.G7B39 552'.3 75-619335

For sale by the Superintendent of Documents, U.S. Government Printing Office

Washington, D.C. 20402

Stock Number 024-001-02755-1
CONTENTS

Page

Abstract _________________________________________________ Dl

Introduction______________________________________________ 1

General geology ____________________________________________ 1

Analytic data ______________________________________________ 2

Tonalite of Blue Canyon ______________________________________ 2

Granodiorite of Dinkey Creek ____________________________________ 3

References cited ________________________________________ 3

ILLUSTRATIONS

Page

FIGURES 1-7. Simplified geologic map of the Shaver Lake quadrangle showing 

1. Locations of chemically analyzed and isotopically dated samples ___ __ D6

2. Quartz _______________________________________________________________ 8

3. Potassium feldspar __________________________________________- - 9

4. Plagioclase _________________________________________________________ 10

5. Mafic minerals ________________________________________________ 11

6. Specific gravity ________________________________________________________ 12

7. Steeply inclined regional joints _________ _____ __________________________ - __ 13

8. Plots of modes of granitic rocks _________________________-_______________-- 14

9. Plots of norms of igneous rocks_______________ __________________ _________ _______ _ 16

TABLES

Page

TABLE 1. Chemical and spectrographic analyses, norms, and modes of representative igneous rocks _________ D17

2. Potassium-argon age determinations on biotite and hornblende from granitic and volcanic rocks of the Shaver Lake

quadrangle _____________________________________________ 20

3. Uranium-lead age determinations on zircon from granitic rocks of the Shaver Lake quadrangle __ _____ - 20

in

SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

SHAVER LAKE QUADRANGLE, CENTRAL SIERRA NEVADA, 

CALIFORNIA ANALYTIC DATA

By PAUL C. BATEMAN and JOHN P. LOCKWOOD

ABSTRACT

More than 400 samples of plutonic rocks were collected during the 

geologic mapping of the Shaver Lake quadrangle. Of these, 368 samples were modally analyzed, and the volume percentages of quartz, 

potassium feldspar, plagioclase, and mafic minerals and the bulk 

specific gravities are plotted, and partly contoured where the data 

permit, separately on a simplified geologic base map. Quartz, potassium feldspar, and plagioclase, calculated to 100 percent, are plotted 

on triangular diagrams. Chemical and spectrographic analyses of 32 

plutonic rocks and 3 volcanic rocks are tabulated, and normative 

quartz, orthoclase, and plagioclase (albite plus anorthite) are plotted 

on a triangular diagram. Data on the ages determined by the 

potassium-argon and uranium-lead methods for some plutonic and 

volcanic rocks are tabulated. A map of conspicuous, steeply dipping 

joints is included.

INTRODUCTION

The Shaver Lake quadrangle is northeast of Fresno 

on the west slope of the central Sierra Nevada. Shaver 

Lake, a lumbering and recreational community in the 

east-central part of the quadrangle, is about 72 

kilometres (45 mi) from Fresno by road. Numerous 

roads, the principal ones paved but many minor ones 

unpaved, provide access to all parts of the quadrangle. 

Altitudes within the quadrangle range from about 

1,000 feet where the San Joaquin River exits the west 

side of the quadrangle to 8,111 feet at Black Point in the 

northeast corner of the quadrangle.

This report supplements the geologic map of the 

Shaver Lake quadrangle (Lockwood and Bateman, 

1975) by providing chemical, spectrographic, and modal 

data on some of the plutonic volcanic rocks. In addition, 

it lists ages determined by the potassium-argon and 

uranium-lead methods for some of the volcanic and 

plutonic rocks. The analytic data are tabulated. These 

maps, diagrams, and tables are the most significant 

parts of the report; the text deals only with factors that 

bear on the interpretation of the analytic data. A nontechnical summary of some of the many interesting 

geologic features accompanies the geologic map.

In this report we follow the classification of plutonic 

rocks recommended by the International Union of 

Geological Sciences (Streckeisen and others, 1973) 

which was developed to eliminate some of the communication problems that beset petrologists as a result of 

different usages of rock names. The part of the classification scheme that affects the names of rocks in the 

Shaver Lake quadrangle is given in figure 8. In fact, 

only two rock names are different from ones used in 

reports on the central Sierra Nevada published during 

the past 15 years. Rocks here called tonalite were included with quartz diorite in earlier reports, and rocks 

here called granite include both quartz monzonite and 

granite of earlier reports.

GENERAL GEOLOGY

The quadrangle is underlain chiefly by plutonic rocks 

ranging in composition from gabbro to leucogranite. 

Metamorphosed sedimentary and volcanic rocks crop 

out at only a few places; volcanic rocks overlie the granitic rocks locally. The granitic rocks constitute many 

different plutons that are in sharp contact with one 

another. Most of these bodies vary internally in composition and texture, but abrupt changes generally are 

confined to contacts between different bodies. The plutons range in size from less than 1 square kilometre to 

several hundred square kilometres. The largest plutons 

extend beyond the quadrangle boundaries. The tonalite 

of Blue Canyon, called the quartz diorite of Blue Canyon 

in reports on the adjoining Huntington Lake quadrangle (Bateman and Wones, 1972a, b), is the most 

extensive rock unit within the quadrangle, occupying 

more than half the quadrangle. Because potassium increases in the plutonic rocks eastward across the Sierra 

Nevada, tonalite predominates west of the Shaver Lake 

quadrangle but is sparsely represented east of the quadrangle. The larger plutons to the east within the Sierra 

Nevada are granodiorite and granite; farther east in the

Dl
D2 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

White Mountains they are monzonite, quartz monzonite, and granite.

The second most extensive rock unit within the quadrangle is the granodiorite of Dinkey Creek. This rock 

unit is widespread in the Huntington Lake quadrangle 

to the east; the part that lies within the Shaver Lake 

quadrangle is a southwestward-trending protrusion. 

Among the other bodies of plutonic rocks, the granite of 

Shuteye Peak and the leucogranite of Big Sandy Bluffs 

are the most extensive. The granodiorite of Whiskey 

Ridge forms a large pluton in the Shuteye Peak quadrangle to the north (Huber, 1968), but only the southern 

part lies within the Shaver Lake quadrangle. The other 

plutonic rocks all form small bodies; none underlies 

more than 26 square kilometres (10 mi2) within the 

quadrangle.

ANALYTIC DATA

In collecting samples of plutonic rocks, our objective 

was to collect one sample per square mile, but because 

exposures are discontinuous and because our principal 

purpose was geologic mapping, our sample localities do 

not show a regularly spaced pattern. More than 400 

samples of plutonic rocks were collected. Of these, 368 

were analyzed modally, and 32 were also analyzed 

chemically and spectrographically (fig. 1). In addition, 

three samples of Tertiary basalt flows and intrusive 

rocks were analyzed chemically and spectrographically, 

and the ages of several samples of both plutonic and 

volcanic rocks were determined by the potassium-argon 

and uranium-lead methods.

Modes were determined by counting 1,000-2,000 regularly spaced points on rocks slabs of not less than 40 

square centimetres (6 in.2) on which potassium feldspar 

had been selectively stained yellow and plagioclase red 

(Norman, 1974). Four constituents were counted: 

quartz, potassium feldspar, plagioclase, and mafic minerals. Biotite, hornblende, and opaque minerals cannot 

be counted separately on stained slabs, and so their 

separate amounts were not determined. The tonalites 

and granodiorites contain both hornblende and biotite, 

whereas granite contains biotite but commonly no more 

than a trace of hornblende. In the granodiorites, biotite 

generally is more abundant than hornblende, whereas 

in the tonalite hornblende commonly exceeds biotite.

The percentages of modal constituents and the specific gravities of samples of plutonic rocks are plotted on 

simplified geologic maps in figures 2-6. Isopleths have 

been drawn where the data permit, but no attempt was 

made to contour systematically all the data. Conspicuous joints, readily visible on aerial photographs, are 

plotted in figure 7, together with a few observations 

made in the field.

The percentage contents of quartz, potassium 

feldspar, and plagioclase were recalculated to 100 and

plotted on ternary diagrams (fig. 8). The percentage 

contents of normative quartz, orthoclase, and plagioclase (Ab + An) are similarly plotted in figure 9. Chemical and spectrographic analyses are listed in table 1 

together with the CIPW norms and the modes of the 

analyzed samples. The radiometric age data are given 

in tables 2 and 3.

TONALITE OF BLUE CANYON

The tonalite of Blue Canyon is divided into four facies: 

a principal facies of biotite-hornblende tonalite and 

granodiorite, a hornblende-biotite facies, a finer 

grained biotite-hornblende tonalite and granodiorite 

facies, and a sheared facies. The principal facies grades 

to the other facies through changes in composition, 

grain size, and the amount of postconsolidation deformation. The finer grained facies differs from the principal facies only in average grain size, but locally it has 

sharp contacts with the principal facies, and part may 

be slightly younger. Perhaps because of the smaller 

grain size and consequent statistical superiority of the 

samples, the modes of the finer grained facies show less 

scatter than those of the other facies (fig. 8). In contrast, 

the sheared facies exhibits the greatest scatter on the 

modal plot, perhaps indicating postconsolidation 

movement of silica and alkalis.

The principal facies and the hornblende-biotite facies 

grade into each other. The hornblende-biotite facies, 

however, is readily distinguished by the presence of 

conspicuous biotite books. Of 15 modes of the 

hornblende-biotite facies, all but 2 plot close to or on the 

Q-P side line of the modal plot, showing that potassium 

feldspar is even less abundant in the hornblende-biotite 

facies than in the principal facies. The distribution of 

the hornblende-biotite facies, in a curving strip 

peripheral to the younger leucogranite of Big Sandy 

Bluffs, suggests that the hornblende-biotite facies may 

have formed from the principal facies as a result of 

thermal metamorphism, with or without metasomatism, as a result of the emplacement of the leucogranite of Big Sandy Bluffs. The required conversion of 

hornblende to biotite would necessarily involve other 

minerals in the rocks. Mehnert (1968, p. 264) suggested 

the following reaction: biotite+plagioclase (45 percent 

An) + quartz ±=z hornblende + sphene + plagioclase (35 

percent An) + orthoclase. Using analyses of biotite 

(Dodge and others, 1968, table 2, p. 398) and hornblende 

(Dodge and others, 1969, table 1, p. 256) extracted from 

sample SL-32, we attempted to complete such a reaction. Our calculations show that a simple reaction with 

no loss or gain of constituents is not possible because of 

the low content of AbOa in the hornblende. When all 

other constituents are balanced, AbOa is greatly in excess on the biotite side of the equation.
SHAVER LAKE QUADRANGLE ANALYTIC DATA D3

Further investigations must be made before the relations between the two facies can be understood, but at 

least two alternate explanations are possible: (1) contamination of the magma that crystallized the biotitehornblende tonalite by aluminous sedimentary material and (2) crystal fractionation of anorthite from the 

biotite-hornblende tonalite magma. Either process 

could yield a magma that would crystallize hornblende-biotite tonalite.

GRANODIORITE OF DINKEY CREEK

Most of the rock in the protrusion of granodiorite of 

Dinkey Creek, which extends into the east side of the 

quadrangle, is equigranular granodiorite and tonalite. 

A porphyritic facies generally less than a few hundred 

metres wide rims the protrusion and in the northeastern part of the quadrangle underlies an extensive area 

that continues into the adjoining Kaiser Peak (Bateman 

and others, 1971) and Huntington Lake quadrangles 

(Bateman and Wones, 1972a). In composition, the porphyritic facies ranges from granodiorite to granite. In 

many plutons, the most mafic rock is marginal; inward 

the rock becomes more felsic and is composed of less 

refractory mineral assemblages. Although few were 

mapped, felsic generally porphyritic margins have been 

observed in several plutons.

As the contact between the porphyritic and the equigranular facies is completely gradational, the relative 

ages of the facies cannot be determined from field relations. The porphyritic facies clearly represents lower 

temperature mineral assemblages than the equigranular facies: the color index is lower, plagioclase has a 

lower An content, and the modal plot (fig. 8) shows that 

the rocks from the porphyritic facies extend into a lower 

temperature region. Although additional studies are 

required to settle the problem conclusively, these relations suggest that the porphyritic facies is the younger

of the two facies and that it spread along the marginal 

contact of the equigranular facies before the equigranular facies was completely crystallized.

REFERENCES CITED

Bateman, P.C., Lockwood, J. P., and Lydon, P. A., 1971, Geologic map 

of the Kaiser Peak quadrangle, central Sierra Nevada, California: U.S. Geol. Survey Geol. Quad. Map GO-894, scale 1:62,500.

Bateman, P.C., and Wones, D. R., 1972a, Geologic map of the Huntington Lake quadrangle, central Sierra Nevada, California: U.S. 

Geol. Survey Geol. Quad. Map GQ-987, scale 1:62,500.

 1972b, Huntington Lake quadrangle, central Sierra Nevada, 

California analytic data: U.S. Geol. Survey Prof. Paper 724-A, 

18 p.

Dalrymple, G. B., 1963, Potassium-argon dates of some Cenozoic volcanic rocks of the Sierra Nevada, California: Geol. Soc. America 

Bull., v. 74, no. 4, p. 379-390.

Dodge, F.C.W., Papike, J.J., and Mays, R.E., 1968, Hornblendes from 

granitic rocks of the central Sierra Nevada batholith, California: 

Jour. Petrology, v. 9, no. 3, p. 378-410.

Dodge, F.C.W., Smith, V.C., and Mays, R.E., 1969, Biotites from 

granitic rocks of the central Sierra Nevada batholith, California: 

Jour. Petrology, v. 10, no. 2, p. 250-271.

Hamilton, W.B., and Neuerburg, G.J., 1956, Olivine-sanidine 

trachy-basalt from the Sierra Nevada, California: Am. 

Mineralogist, v. 41, p. 851-873.

Huber, N.K., 1968, Geologic map of the Shuteye Peak quadrangle, 

Sierra Nevada, California: U.S. Geol. Survey Geol. Quad. Map 

GQ-728, scale 1:62,500.

Kistler, R.W., Bateman, P.C., and Brannock, W.W., 1965, Isotopic 

ages of minerals from granitic rocks of the central Sierra Nevada 

and Inyo Mountains, California: Geol. Soc. America Bull., v. 76, 

no. 2, p. 155-164.

Lockwood, J.P. and Bateman, P.C., 1975, Geologic map of the Shaver 

Lake quadrangle, central Sierra Nevada, California: U.S. Geol. 

Survey Geol. Quad. Map GQ-1271, scale 1:62,500 (in press).

Mehnert, K.R., 1968, Migmatites and the origin of granitic rocks: 

Amsterdam, Elsevier, 393 p.

Norman, M.B., 1974, Improved techniques for selective staining of 

feldspar and other minerals using amaranth: U.S. Geol. Survey 

Jour. Research, v. 2, no. 1, p. 73-79.

Streckeisen, A.L., and others, 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.

FIGURES 1-9; TABLES 1-3
D6 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

119 SO00'

FIGURE 1. Shaver Lake quadrangle showing the locations of chemically analyzed and isotopically dated rock samples. Numbers refer to

sample numbers in tables 1-3.
SHAVER LAKE QUADRANGLE ANALYTIC DATA 

EXPLANATION

D7

Granodiorite of 

Stevenson Creek

Granodiorite of 

Big Creek

Leucogranite of

Burrough and

Black Mountains

Leucogranite of Big 

Sandy Bluffs

Granite of 

Shuteye Peak 

Ksps, Shuteye Peak pluton 

Kspm, Mussick Mountain pluton

Granite of 

Ordinance Creek

Grancoici 1 e of Pick 

and Shovel mine area

Granodiorite of

Dinkey Creek

Porphyritic fades shown

by overprint

Granite of 

Sheepthief Creek

Contact

 A

Plutonic rock Other 

Location of chemically 

analyzed sample

x +

U-Pb K-Ar

Location of radiometrically 

dated sample

Vertical Inclined

Strike and dip of joints

Arrow indicates sense of lateral movement.

Shown only in figure 7

Tonalite of Blue

Canyon

Kbl, biotite-hornblende fades 

Kblb, hornblende-biotite fades 

Kblf, finer grained fades 

Kblm, sheared fades

W 

H

D 

O 

W 

U 

< 

H 

W 

«

u

Tonalite of 

Ross Creek

Metasedimentary 

rocks

c«

o g

l g <

g "

^ rt 

u

oo

D 

O

£" 

04 <

^H 

W 

& 

U

FIGURE 1. Continued.
D8

119° SOSHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

119 15'

00'

FIGURE 2. Shaver Lake quadrangle showing quartz, in volume percent. Explanation in figure 1.
SHAVER LAKE QUADRANGLE ANALYTIC DATA D9

119 30 119 15'

FIGURE 3. Shaver Lake quadrangle showing potassium feldspar, in volume percent. Explanation in figure 1.
DIG SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

119 30 119 15'

jg-^kdcS' Xv-'T-jH--.-^.*.--^-

\33;X 7-s*?*-

^. 

:52y'^

00'

FIGURE 4. Shaver Lake quadrangle showing plagioclase in volume percent. Explanation in figure 1.
SHAVER LAKE QUADRANGLE ANALYTIC DATA Dll

119 soFIGURE 5. Shaver Lake quadrangle showing mafic minerals in volume percent. Explanation in figure 1.
D12 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

119 30' 2.68 119 15*

00'

FIGURE 6. Shaver Lake quadrangle showing specific gravity. Explanation in figure 1.
SHAVER LAKE QUADRANGLE ANALYTIC DATA D13

119 15'

00'

FIGURE?. Shaver Lake quadrangle showing steeply inclined regional joints (heavy lines), as observed on aerial photographs, and the attitude of joints, as observed on the ground. See figure 1 for explanation.
D14 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

CLASSIFICATION 

PLAN

EXPLANATION

Q Quartz

A Alkali-feldspar including 

plagioclase An0 _ 5 average 

composition

P Plagioclase An 5 _ 100

\ '

, \ monzo VO.

____ / _monzonite^ \ djorjte

Monzonite ft/lbnzodiorit

65 90

o Gr 

 Gr

EXPLANATION

le-grained felsic rocks 

ucogranite of Lion Point 

anodiorite of Big Creek 

anodiorite of Whiskey Ridge 

anodiorite of Stevenson 

reek

35 35 65 90

EXPLANATION

o Granite of Mushroom Rock 

+ Granite of Ordinance Creek 

 Granodiorite of Pick and 

Shovel mine area

Gr

EXPLANATION

nite of Shuteye Peak 

Shuteye Peak pluton 

Mussick Mountain pluton 

enite of Sheepthief Creek

35 65 90 35 65 90

FIGURE 8. Plots of modes of granitic rocks. Classification plan by Streckeisen and others (1973).
SHAVER LAKE QUADRANGLE ANALYTIC DATA D15

EXPLANATION

Granodiorite of Dinkey Creek 

 Porphyritic facies 

o Equigranular facies

EXPLANATION

ucogranite of Big Sandy Bluffs

renite of Burrough and 

Mountains

35 65 90 35 65 90

EXPLANATION

Tonelite of Blue Canyon 

Biotite-hornblende fecies 

Hornblende-biotite fecies 

Finer grained facies 

Sheared facies

60 EXPLANATION

« Tonalite south of Black Mountain 

o Tonalite of Ross Creek

 Gebbro, diorite, quartz diorite, and 

tonalite

90

FIGURE 8. Continued.
D16 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

Quartz

EXPLANATION

Volcanic rocks

Aplite

Leucogranite of Lion Point

Granodiorite of Whiskey Ridge

Granodiorite of Stevenson Creek

Granite of Mushroom Rock

Granite of Shuteye Peak

Leucogranite of Big Sandy Bluffs

Granodiorite of Dinkey Creek

Tonalite of Blue Canyon

Tonalite south of Black Mountain

Tonalite of Ross Creek

Gabbro

Orthoclase Plagioclase (An+Ab)

FIGURE 9. Plot of norms of igneous rocks.
SHAVER LAKE QUADRANGLE ANALYTIC DATA D17

TABLE 1. Chemical and spectrographic analyses, norms, and modes of representative igneous rocks

[Chemical analyses: Standard rock analysis of SL-18 by D. F. Powers; rapid-rock analysis of HL-199-1 by W. Blake; analyses of all others performed under the supervision of Leonard 

Shapiro. Semiquantitative spectrographic analysis of SL-18 by P. R. Barnett, of HL-199-1 by A. A. Chodas, of JB-1 and SL-1 by R. E. Mays, and of all others by Chris Heropoulos. 

Values reported to the nearest number in the series 1, 0.7, 0.5, 0.3, 0.2, 0.15, 0.1, etc., which represent midpoints on a geometric scale; the precision of a value is approximately plus or 

minus one bracket of 68 percent confidence or two brackets at 95 percent. N = not detec ted; detection limits given in parentheses after element symbols. The following chemical analyses have been published previously: HL-199-1, by Hamilton and Neuerburg (1965, p. 868, table 4); SL-18, by Dodge, Papike, and Mays (1968, p 382, table 1). Modal analyses by 

Oleg Polovtzoff: 1,000- to 2,000-point counts on a slab of at least 70 cm2]

Gabbro

SLb-185 SLd-100

Tonalite 

Tonalite of south of 

Ross Creek Black 

Mountain

SLb-64 SLc-lSlB-l

Tonalite of Blue Canyon

Biotite-hornblende facies

JB-1 SI.-32 SL»-48 SLb-63 SLc-107 SLc-115 SLd-36

Chemical analyses (weight percent)

SiQi

AkOa _______________

FteOi ____________ __

FeO - _ ______________

MgO ___________________

CaO _____________ _ . NasO ... __ _ __________

feO ... _ ___________

H.O+ . _ ______________

H.O- _______________

TiQi ___________________

ROs ___ _ ___ ______

MnO _ ______________

CO2 ___________________

LessO

Powder density 

(gm/cm3)

_____ 51.0

9 7

1 9

.__- 10.0

_____ 16.5

_____ 1.6

48

_____ .51

.14

_____ .10

_____ .10

_____ 99

45.8 

24.0 

2.5 

3.8 

5.3 

13.2 

1.7 

.42 

1.1 

.22 

1.2 

.04 

.07 

.01

99

61.6 64.5 

16.8 17.3 

2.1 1.6 

4.3 3.2 

3.3 2.2 

5.6 4.4 

3.1 3.6 

2.5 2.2 

.70 .53 

.06 .12 

.81 .60 

.14 .13 

.08 .06 

.06 .04

101 100

60.8 71.70 

16.9 14.90 

1.7 .88 

4.3 1.25 

2.8 .82 

5.6 2.60 

3.3 3.15 

2.3 3.40 

.95 .66 

.05 .11 

.94 .33 

.21 .07 

.09 .05 

<.05 <.05

99.9 99.9

67.3 

16.6 

1.8 

2.2 

1.6 

4.6 

3.5 

2.2 

.64 

.07 

.61 

.14 

.05 

.04

101

65.1 

16.4 

1.8 

1.9 

1.6 

3.8 

3.5 

3.2 

.58 

.05 

.61 

.10 

.03 

.01

99

65.1 

16.6 

2.1 

2.4 

2.0 

4.7 

3.6 

2.3 

.74 

.13 

.65 

.16 

.05 

.02

101

58.5 

18.8 

2.8 

3.8 

2.9 

6.5 

3.7 

1.3 

.88 

.10 

.83 

.18 

.08 

.03

100

66.1 

16.5 

2.0 

2.6 

1.9 

4.8 

3.2 

2.4 

.82 

.10 

.72 

.13 

.05 

.02

101

Semiquantitative spectrographic analyses (parts per million)

B(7) _________________

Ba(2)_ _____

Be(l)______________-___.

Ce (70) __________________

Co (2) _______________

Cr(l) __________________

Cu(0.7) _ __ _____

Ga(2) _-_ ___- __.

La(30)_________________.

Nb(7) __________________

Ni(2) ____________ _____

Pb(7) _-__ .__-______

Sc(2) _ ___-_-___.

Sr (5) _ _ ___ _.

V(3)_. _ _ ___ ._ ___.

Y(7.__-_-__-_-__. __ _.

Yb(0.7) _______________

Zr(10) __________________

. . N

_ __ 1,000

. __ N

_____ N

3

_____ 1.5

.. 10

_____ 50

_____ N

_____ 500

_____ 20

5

_____ 300

. __ 15

_____ 15

1.5

_____ 200

N 

100 

N 

N 

20 

150 

7 

15 

N 

N 

15 

N 

70 

700 

300 

15 

2 

15

20 N 

700 700 

N N 

N N 

15 10 

50 15 

30 5 

15 15 

N N 

7 N 

15 5 

10 7 

20 15 

500 300 

100 50 

30 15 

3 1.5 

150 100

N 15 

700 700 

N 1.5 

N N 

15 30 

15 7 

10 3 

15 10 

N N 

N 7 

7 N 

N 30 

15 3 

700 500 

150 50 

20 7 

2 1 

150 150

N 

700 

N 

N 

7 

7 

10 

15 

N 

N 

1.5 

15 

10 

500 

50 

10 

.7 

150

N 

700 

1 

N 

7 

10 

1.5 

20 

N 

7 

1 

20 

7 

700 

50 

10 

1.5 

100

N 

700 

N 

N 

10 

10 

5 

20 

N 

N 

3 

15 

10 

700 

50 

10 

.7 

100

N 

500 

N 

N 

15 

7 

15 

20 

N 

N 

3 

N 

20 

700 

70 

20 

'1.5 

100

N 

700 

N 

100 

10 

10 

7 

20 

70 

10 

3 

30 

10 

700 

70 

15 

1 

150

CIPW norms (weight percent)

Q ______________________

c

ab ________________ ___ .

fs ____ ___________

fo _____________________

fa ______________________

mt

il ____________________

ap _.__-_- ___.

hm___

Other ___ __ __ _ __.

Total

 - 17.87

_____ 13.44

_____ 4.80

_____ 2.08

_____ 1.08

. . .23

_ __ 98.40

2.48 

14.38 

56.61 

3.59 

9.50 

2.20 

2.60 

.66 

3.62 

2.28 

.09

98.01

15.71 21.13 

 1.31

14.77 13.00 

26.23 30.46 

24.54 20.98 

97

8.22 5.48 

4.97 3.68

3.04 2.32 

1.54 1.14 

.33 .30

100.32 99.80

15.4 33.3 

.05 1.49 

13.5 20.0 

27.8 26.7 

24.5 12.5 

.80

6.95 2.05 

5.23 1.10

2.40 1.28 

1.78 .63 

.50 .18

.01

98.92 99.23

25.93 

.43 

13.00 

29.62 

21.91

3.99 

1.64

2.61 

1.16 

.33

100.62

21.77 

.51 

18.91 

29.62 

18.20

3.99 

1.05

2.61 

1.16 

.23

98.05

21.99 

.03 

13.59 

30.46 

22.27

4.98 

1.69

3.04 

1.23 

.37

99.65

12.74

7.68 

31.31 

30.85 

.09 

7.22 

3.44

4.06 

1.58 

.42

99.39

24.63 

.22 

14.18 

27.08 

22.96

4.73 

2.03

2.90 

1.37 

.30

100.40

Modes (volume percent)

Potassium

Plagioclase

Mafic minerals _ .

Total. _ _ _ _

Bulk specific

2.87

_ ___ 24

______ 60

 10

100

__ __ 2.72

15 33

3 20 

59 38 

24 10

101 101 

2.77 

29

5 

53 

14

101 

2.72

28

7 

51 

14

100 

2.69

25

5 

54 

16

100 

2.74

18

<.5 

58 

23

101 

2.80

31

5 

46 

17

99 

2.73
D18 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

TABLE 1. Chemical and spectrographic analyses, norms, and modes of representative igneous rocks Continued

Tonalite of Blue Canyon Continued Granodiorite of Dinkey Creek

Hornblende-biotite J^d Sheared Equigranular facies 

facies Bfacies facies

SLa-97 SLc-111 SLc-70 SLa-39 SL-1 SLb-5 SLd-20

Porphyritic facies

SI.-18 SLd-52

Leucogranite of 

Big Sandy Bluffs

SLc-60 SLc-119

Chemical analyses (weight percent) Continued

SiO_

AbO. _ ____ _

Fe2Oa __ .

FeO _ _ _

MgO ___________________

CaO ___________________

NaaO . _ __________

KaO ___________________

H.O + -_-_-___-_______

HaO- _________________

TiO. _______________ _

P.05 ______ _ .____-_

MnO_______________

CO* __________ __ _____

Less O _ _

_____ 71.1

15.8

_____ 1.2

_____ 1.9

_____ 1.0

... .. 3.2

__ _ 3.8

_____ .47

_____ .07

_____ .44

_____ .08

_ __ .02

_____ .03

 - 101

65.1 62.0 59.5 58.7 61.7 68.9 

17.4 17.2 18.0 16.6 16.5 14.8 

1.8 2.4 2.7 2.0 2.1 1.7 

2.5 3.5 4.6 5.1 4.2 2.3 

1.6 2.5 3.0 3.2 2.7 1.6 

4.9 5.5 6.0 6.4 5.2 3.3 

3.7 3.5 3.2 2.9 2.7 3.0 

1.4 2.0 1.8 2.0 2.5 4.1 

.72 .63 .88 1.3 .89 .70 

.21 .12 .07 .19 .21 .07 

.53 .91 .68 .95 .90 .52 

.13 .14 .11 .21 .20 .08 

.06 .07 .16 .12 .13 .05 

.07 .03 .03 <.09 <.05 .03 

_ _ _ __ __ _ .06 ___ - -

100 101 101 99.7 101.01 101

65.60 

15.37 

1.16 

3.60 

1.91 

4.39 

3.03 

3.17 

.47 

.05 

.67 

.13 

.09 

.02

99.7 

2.76

71.1 

14.9 

1.3 

1.2 

.66 

2.0 

3.4 

4.3 

.57 

.10 

.27 

.04 

.02 

.04

100

74.3 

14.9 

1.1 

.76 

.40 

2.4 

4.2 

1.9 

.36 

.04 

.17 

.03 

.01 

.03

101

74.8 

14.1 

.79 

.80 

.45 

1.6 

3.7 

3.6 

.50 

.06 

.14 

.03 

.01 

.06

101

Semiquantitative spectrographic analyses (parts per million) Continued

B(7)

Ba(2) _ .. .......

Be(l) _________________

Ce (70) _________________

Co (2) ... . _ . __

Cr(l) .................

Cu (0.7) _ .. __ _

Ga (2) _ _ ___ _

La (30) _________________

Nb (7) __ _-. - ... _

Ni (2) ._ _ -_ _

Pb(7) _______________

Sc(2) _________________

Sr(5) _________________

V (3) . _______________

Y(7) . ...

Yb(0.7) --__ _ _ _ _

Zr(10) __ __ _ __ __

_____ N

-. - 1,500

_____ N

_____ N

___ 2

_____ N

 - N

 - N

_____ 20

 - N

 N

N N N N N N 15 

700 700 500 700 700 700 200 

N N 2 N N N N 

N N N N N 100 N 

7 15 15 20 15 10 7 

3 10 10 20 15 10 7 

3 5 20 20 10 5 3 

20 20 20 20 20 15 7 

N N N N 70 70 70 

N N N N N N 7 

N 2 1 7 N 3 3 

7 10 10 N 10 20 15 

10 15 30 20 15 10 15 

700 700 500 1,500 500 300 700 

30 100 100 150 100 50 70 

N 20 30 20 20 20 15 

N 1.5 3 2 2 2 1.5 

150 150 70 100 100 150 30

N 

700 

1.5 

N 

2 

2 

1 

15 

N 

7 

N 

30 

5 

200 

15 

20 

1.5 

150

N 

3,000 

N 

70 

N 

2 

1 

15 

50 

N 

N 

N 

N 

300 

7 

N 

N 

150

N 

1,000 

1.5 

N 

N 

1.5 

1.5 

15 

N 

N 

N 

20 

N 

200 

10 

N 

N 

50

CIPW norms (weight percent) Continued

Qc :___::::::::::::;::::

ab ___________ _ ____ _

fs ______________________

fo ___ .............

fa _____ _ .. ...........

mt

il ________ ___ ____

Other _ _ _ _ _

Total __

 31.63

_____ 13.00

_____ 15.35

1.81

 __ 1.74

.84

_ __ .19

_ _ 100.74

24.61 17.70 14.52 14.5 19.67 25.82

8.27 11.82 10.64 11.9 14.77 24.23 

31.31 29.62 27.08 24.3 22.85 25.39 

23.46 25.31 29.05 26.7 24.49 14.81

3.99 6.23 7.47 7.97 6.73 3.99 

2.34 3.07 5.39 6.38 4.73 2.05

2.61 3.48 3.91 2.91 3.04 2.46 

1.01 1.73 1.29 1.81 1.71 .99 

.30 .33 .26 .49 .46 .19

___ ___ _ .06 ______

99.13 99.73 99.75 98.55 98.83 100.36

22.47

18.79 

25.58 

19.12 

.65

4.77 

4.73

1.69 

1.28 

.31

.14

99.53

29.38 

1.11 

25.41 

28.77 

9.66

1.64 

.72

1.88 

.51 

.09

99.17

36.84 

1.64 

11.23 

35.54 

11.71

1.00 

.22

1.59 

.32 

.07

100.16

35.21 

1.28 

21.27 

31.31 

7.74

1.12 

.60

1.15 

.27 

.07

100.02

Modes (volume percent) Continued

Potassium

Mafic minerals

Total.. . -.

Bulk specific

___ 37

 - 44

_____ 11

100

2 69

29 19 20 15 21 29 

1 ___ 1 7 20

57 57 59 61 51 39 

14 23 21 23 22 12

100 100 100 100 101 100 

2.74 2.77 2.79 2.80 2.78 2.71

27

14 

41 

18

100 

2.70

31

23 

39

7

100 

2.66

39

8 

50 

4

101 

2.67

32

22

41 

5

100 

2.64
SHAVER LAKE QUADRANGLE ANALYTIC DATA 

TABLE 1. Chemical and spectrographic analyses, norms, and modes of representative igneous rocks Continued

D19

Granite of Shuteye Peak

SLa-16 SLa-129 SLb-13 SLb-70

Granite of Granodiorite Granodiorite Leucogranite

Mushroom Rock Stevenson «,, . , ° D -J T °T> *. Creek Whiskey Ridge Lion Point

SLb-57 SLb-109 SLb-166 - SLa-77 SLa-91

Aplite

SLb-86

Volcanic rocks

HL-199-1 SLb-89A SLb-96A

Chemical analyses (weight percent) Continued

73.0 

15.0 

1.4 

1.3 

.48 

2.0 

4.2 

3.3 

.33 

.08 

.26 

.06 

.01 

.02

101

73.6 

14.2 

.88 

1.2 

.52 

2.2 

3.0 

3.7 

.43 

.13 

.27 

.06 

.06 

.05

99

73.2 

14.8 

1.1 

1.1 

.48 

1.8 

3.6 

4.3 

.21 

.06 

.43 

.05 

.02 

.03

101

71.0 

15.4 

1.4 

1.3 

.64 

2.0 

3.8 

3.6 

.45 

.09 

.29 

.08 

.02 

.08

100

73.8 73.2 70.3 64.3 72.3 

14.4 14.8 15.5 16.8 15.3 

.99 1.1 1.4 2.0 .90 

.88 .84 1.7 3.3 1.1 

.30 .44 .78 2.2 .65 

1.5 1.8 2.6 4.8 2.2 

3.0 3.4 3.6 3.5 3.3 

5.3 4.2 3.4 2.3 4.1 

.75 .39 .45 .66 .71 

.03 .07 .11 .13 .43 

.34 .20 .36 .79 .25 

.03 .04 .09 .16 .06 

.00 .00 .02 .06 .03 

.08 .01 .05 .07 .02

101 100 100 101 101

Semiquantitative spectrographic analyses (parts per million) 

N 

1,0001

100 

2 

N 

.7 

20 

70 

N 

N 

15 

3 

200 

7 

20 

1.5 

200

N 

1,000 

1.5 

N 

2 

2 

.7 

15 

N 

N 

N 

15 

5 

200 

20 

15 

1.5 

150

N 

1,500 

1.5 

N 

N 

1.5 

1.5 

20 

N 

N 

N 

20 

5 

300 

15 

20 

1.5 

100

N 

1,000 

1.5 

N 

2 

2 

1 

20 

70 

10 

N 

20 

N 

300 

15 

15 

1 

200

N N N N N 

1,000 1,000 1,000 700 1,500 

1.5 2 N N 1.5 

100 N N N N 

N N 3 10 N 

N 1.5 3 10 1.5 

1.7 1.5 1.5 7 1.5 

20 15 15 20 20 

70 N 50 N N 

N N N N N 

N N N 2 N 

30 30 20 7 30 

N N 5 15 3 

300 300 300 500 300 

7 7 15 70 10 

10 10 15 20 10 

1 1 1.5 1.5 1 

150 150 200 150 150

76.1 

13.3 

.47 

.28 

.03 

1.4 

3.6 

3.9 

.03 

.29 

.04 

.00 

.00 

<.05

100

Continued

15 

200 

2

N 

N 

N 

2 

15 

N 

15 

N 

50 

N 

150 

N 

N 

N 

50

52.1 

13.7 

9.0 

1.31 

8.5 

6.8 

2.60 

3.06

1.38 

.71 

.24

99.40

50 

1,000 

2

50 

100 

30 

20

200 

10 

30 

1,000 

100 

50 

5 

100

53.1 

14.9 

3.9 

5.9 

5.1 

7.3 

3.0 

3.6 

2.1 

.90 

.93 

.56 

.10 

.42

100 

2.68

N 

1,000 

3 

N 

50 

300 

100 

20 

N 

N 

150 

20 

30 

1,000 

200 

20 

1.5 

150

57.9 

13.5 

1.4 

4.4 

8.2 

5.0 

3.0 

2.6 

.79 

2.0 

.63 

.52 

.10 

<.05

100 

2.76

30 

1,000 

2 

N 

30 

500 

70 

15 

N 

N 

500 

30 

15 

1,000 

150 

15 

1.5 

150

CIPW norms (weight percent) Continued

30.74 

1.03 

19.50 

35.54 

9.53

1.20 

.82

36.15 

1.40 

21.86 

25.39 

10.52

1.30 

1.14

31.17 

1.07 

25.41 

30.46 

8.60

1.20 

.44

29.75 

1.81 

21.27 

32.15 

9.40

1.59 

.79

32.38 32.81 29.23 20.56 31.48 

1.07 1.48 1.39 .21 1.58 

31.32 24.82 20.09 13.59 24.23 

25.39 28.77 30.46 29.62 27.92 

7.25 8.67 12.31 22.77 10.52

.75 1.10 1.94 5.48 1.62 

.24 .30 1.41 3.21 .92

37.16 

.61 

23.05 

30.46 

6.95

.07 

.06

2.71

18.08 

22.00 

16.67 

5.19 

21.17

2.48

21.27 

25.39 

16.56 

6.68 

12.70 

2.59

7.50

15.36 

25.39 

16.69 

2.39 

20.42 

6.07

2.03 

.49 

.14

101.02

1.28 

.51 

.14

99.69

1.59 

.82 

.12

100.88

2.03 

.55 

.19

99.53

1.44 1.59 2.03 2.90 1.30 

.65 .38 .68 1.50 .47 

.07 .09 .21 .37 .14

100.56 100.01 99.75 100.21 100.18

.68 

.08

.32

99.44

1.01 

2.62 

1.65 

8.31

99.41

5.65 

1.77 

1.30

3.42

99.81

2.03 

1.20 

1.21

2.79

100.05

Modes (volume percent) Continued

30

25 

38

7

100 

2.65

27

24 

43 

6

100 

2.66

26

25 

43 

6

100 

2.66

30

18 

42 

10

100 

2.66

27 30 29 25 32

27 27 21 4 23 

40 39 41 50 38 

6 4 10 21 7

100 100 101 100 100 

2.64 2.65 2.68 2.78 2.62

35

26 

39 

<.5

100 

2.64
D20 SHORTER CONTRIBUTIONS TO GENERAL GEOLOGY

TABLE 2. Potassium-argon age determinations on biotite and hornblende from granitic and volcanic rocks of the Shaver

Lake quadrangle

[Determinations for SL-18, SL-25, SL-32, and SL-36 from Kistler, Bateman, and Brannock (1965, p. 158, table 1). Determinations for KA-998 from Dalrymple 

(1963, p. 380, table 1). Determinations for SLd-8, SLd-11, and SLb-89A are by R. W. Kistler. K analyses by Lois Schlocker. \B=4.72xlO~ 10 year" 1 ; 

Xe=0.584x 10~10 year -1; 1.19x 10~4 atoms ^K/atoms K. Estimated uncertainty, owing to analytic uncertainties of potassium and argon, of each age at 

the 68 percent confidence level is ±30 percent]

Sample 

No.

SLr-18 __ .

SI.-18 _____

SI.-25 __ .

SLd-8 _____

SLd-8 __ .

SLr-32

SLr-32

Sir-36

SLd-ll____.

SLd-ll_____

SLb-89A ___

KA-998

Rock unit

do

. _ ____ ___ ______do _ ___ _ ____

.___________________do_____________

do

________ ___ __ __ do____ ___ .___

.__________.________do_____________

.___________________do_____________

of Big Creek.

Sugarloaf Hill.

K

Mineral (weight 

percent)

___do 

. Biotite

___do ____- 

7.58 

0.79 

7.06 

9.46 

1.038 

7.01 

0.62 

5.99 

9.25 

0.881 

9.34

2.01

Radiogenic 40 Ar 

(moles/gm xlO-11 )

126.7 

13.1 

115.5 

130.76 

15.61 

113.1 

12.32 

96.8 

126.89 

13.54 

15.29

5.58

Percentage of Age 

radiogenic Ar (m.y.)

88 

82 

84 

93 

90 

82 

69 

84 

67 

89 

66

72

92 

91 

90 

91.5 

99.3 

89 

109 

89 

90.7 

101.6 

11.1

9.5

TABLE 3. Uranium-lead age determinations on zircon from granitic 

rocks of the Shaver Lake quadrangle

[Determinations by T. W. Stern. Constants used: 238U/235U = 137.88; 238X = 0.155xlO~9 

years. Analytic uncertainties ~±3 percent]

Sample_____________________________ SL-1 JB-1

Rock unit ______ __________________ Granodiorite of Tonalite of

Dinkey Creek Blue Canyon

Parts per Pb ___________ 21.94 14.41

million. U ___________ 725.0 569.3

Atomic 204Pb_________ 0.631 0.232

percentage. 2o6Pb__________ 58.08 65.98

207Pb__ ___________ 11.85 8.157

2o8Pb_ ________ 29.44 25.63

Age (m.y.) ___2oopb/238u ______ 104 116

. S. GOVERNMENT PRINTING OFFICE: 1975-0-690-036/48