Strontium, Lead, and Oxygen 

Isotopic Data for Granitoid 

and Volcanic Rocks from the 

Northern Great Basin and 

Sierra Nevada, California, 

Nevada and Utah

By J. L. Wooden1 , R. W. Kistler1 , and R. M. Tosdal2

Open-File Report 99-569

1999

This report is preliminary and has not been reviewed for conformity with 

the U.S. Geological Survey editorial standards or with the North American 

Stratigraphic Code. Any use of trade, product or firm names is for 

descriptive purposes only and does not imply endorsement by the U.S. 

Government.

U.S.DEPARTMENT OF THE INTERIOR 

U.S. GEOLOGICAL SURVEY

1 U.S. Geological Survey, 345 Middlefield Road (MS 937), Menlo Park, CA 94025,

2 Mineral Deposit Research Unit, University of British Columbia, 6339 Stores Road, Vancouver, 

BC V6T 1Z4 Canada
TABLE OF CONTENTS 

INTRODUCTION.......................................................................

ANALYTICAL METHODS...................................................................................................^

REFERENCES CITED............................................................................................................6

TABLE !....................................._

TABLE 2..................................................................................................................................19
Strontium, Lead, and Oxygen Isotopic Data for Granitoid and Volcanic 

Rocks from the Northern Great Basin and Sierra Nevada, California, 

Nevada, and Utah

By J. L Wooden, R. W. Kistler, and R. M. Tosdal

INTRODUCTION

A Pb isotopic study of Mesozoic and Tertiary granitoid and some 

Tertiary volcanic rocks that had been investigated previously for their 

initial 87Sr/86Sr isotopic values in the northern Great Basin (e.g. Kistler 

and Lee, 1989; Robinson and Kistler, 1986) has been completed and 

interpreted with respect to regional crustal structure and to the 

occurrence of gold deposits (Wooden and others, 1998). The values of 

initial 206Pb/204Pb, 207Pb/204Pb, and 208Pb/204Pb of the igneous rocks are 

systematically variable, and the northern Great Basin is divided into 

western, central, and eastern crustal provinces based on the geographic 

distribution of characteristic Sr and Pb isotopic values (Figure 1). The 

boundary between the western and central crustal provinces closely 

follows the previously documented initial 87Sr/86Sr=0.706 line (e.g. 

Kistler, 1991) and represents a narrow zone in which initial Pb and Sr 

isotopic ratios increase rapidly. Initial Pb and Sr isotopic ratios are 

strongly correlated, generally increasing from west to east across these 

two provinces. In contrast, the eastern province is characterized by 

plutons that are not strongly correlated isotopically and that have more 

variable isotopic ratios than those to the west. The boundary between the 

central and eastern Pb isotopic provinces is sharp, and it is approximately 

coincident with the Carlin gold belt in north-central Nevada. We suggest, 

this isotopic boundary and the gold belt mark the locus of a cryptic major 

crustal fault. The Battle Mountain-Eureka or Cortez trend of gold 

mineralization lies within the central isotopic province and is generally 

parallel to both the Carlin trend and the N-S oriented portion of the 

boundary between the western and central provinces (the ISr=0.706 line). 

It is proposed that all three of these features are related to faults formed 

during the major period of continent-scale rifting that affected western 

North America in the late Precambrian and were reactivated or utilized by 

later tectonic and magmatic events in the Phanerozoic. This report gives 

the locations and isotopic data that were used to derive the conclusions 

stated above. Where available for these specimens, oxygen isotopic data 

are are also compiled in this report.
OR

206Pb -0.706- Line

Eastern

Proterozoic

Craton' Edge

Figure 1. Map of the crustal boundaries and regions defined by initial 

206Pb/204Pb for plutons in Nevada and adjoining parts of California and Utah 

and a comparison to the previously defined initial 87Sr/8GSr=0.706 line and 

to the Carlin trend. The break between Archean and Proterozoic crust in 

the eastern province is not defined clearly and probably represents a 

gradational boundary (modified from Wooden and others, 1998).

4
ANALYTICAL METHODS

The Sr isotopic data tabulated herein have been gathered over more 

than 20 years, mostly in the Sr isotope laboratory at the USGS in Menlo 

Park, California. Results are presented for whole-rock granitoid powders 

milled to less than 200 mesh (e.g. Kistler and Lee, 1989). Strontium 

isotopic compositions were determined on two different mass 

spectrometers and are normalized to 86Sr/88Sr=0.1194. Measurements of 

NBS strontium carbonate standard SRM 987 yield a mean 87Sr/86Sr of 

0.710239±0.000015 over this period. The decay constant for rubidium used 

to calculate the initial 87Sr/86Sr values reported in Table 1 is from 

Steiger and Jager (1977). Analytical uncertainties in whole-rock 87Sr/86Sr 

values are about ±0.008%. However, we report initial 87Sr/86Sr values to 

only ±0.014% (1 in the 4th place) because of uncertainties in ages 

assigned to many of the plutons investigated in this study. Strontium data 

from other labs is referenced in Table 1.

Oxygen isotope compositions for samples beginning with GR in Table 

1 are from Lee and others (1981). The other oxygen isotope compositions 

were determined by the BrF5 technique of Clayton and Mayeda (1963), 

using conventional isotope ratio mass spectrometry in the USGS stable 

isotope laboratory of the late Ivan Barnes. All of the d-values are given in 

permil relative to the SMOW standard. All samples were analyzed in 

duplicate with reproducibility of d 180of ± 0.15 permil or better.

The Pb isotope data have been determined over about a ten year 

period in the Pb isotopic laboratory at the U.S. Geological Survey in Menlo 

Park for a number of topical studies (e. g. Wright and Wooden, 1991) 

focused primarily on magmatic and tectonic histories and processes. Most 

of the initial lead isotopic compositions were obtained on feldspar 

separates made from whole-rock crushes by conventional magnetic and 

heavy-liquid separation techniques. Sodium and particularly K-rich 

feldspars from granitoid rocks have relatively high concentrations of Pb 

and very low concentrations of U and Th. For "GR" samples the present-day 

Pb isotopic composition of the whole-rock powder has been determined 

along with a Pb concentration by the isotope dilution technique. These 

data have been combined with U and Th concentration and crystallization 

age data (Lee, 1984; Kistler and Lee, 1989) to calculate an initial Pb 

isotopic composition for each specimen.

Pb was separated from feldspar and whole-rock samples using 

standard anion exchange resin processes that utilize HBr and HCI. All 

feldspar mineral separates were leached with HCI, HN03 , and weak HF to
remove labile Pb before dissolution. Pb isotopic compositions were 

determined in static-collection mode on a MAT 262 mass spectrometer. 

Thermal fractionation is monitored by running NBS-981 and -982. The 

empirically determined fractionation correction factor is 0.0011 per mass 

unit and its uncertainty is the largest contribution to the total analytical 

uncertainty of about 0.1% associated with the Pb isotopic ratios.

Data are given in two tables: Table!. Northern Great Basin, Sierra 

Nevada Pb, Sr and oxygen Isotopic Data; Table 2. Northern Great Basin Pb 

Isotopic data.

REFERENCES CITED

note: Numbered references are cited in Tables 1 and 2.

Clayton, R. N., and Mayeda, T.K., 1963, the use of bromine pentafluoride in the extraction of oxygen from oxide and silicates for 

isotopic analysis: Geochimica and Cosmochimica Acta. V.27, p. 43- 

52.

Compton, R.C., Todd, V.R., Zartman, R.E., Naeser, C.W., 1977, Oligocene 

and Miocene metamorphism, folding, and low-angle faulting in 

northwestern Utah: Geological Society of America Bulletin, v.88, 

p. 1237-1250. (3)

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

constraints on the crustal structure of the northern Great Basin: 

Geological Society of America Bulletin, v. 102, p. 1077-1092. (9)

Farmer, G. L, and Depaolo, D. J., 1983, Origin of Mesozoic and Tertiary 

granite in the western United States and implications for preMesozoic crustal structure: 1, Nd and Sr isotopic studies in the 

geocline of the northern Great Basin: Journal of Geophysical 

Research, v.88, p. 3379-3401. (5)

John, D.A., 1995, Tilted middle Tertiary ash-flow calderas and subjacent 

granitic plutons, southern Stillwater Range, Nevada: Cross sections 

of an Oligocene igneous center: Geological Society of America 

Bulletin, v. 107, no. 2, p. 180-200. (16)

John, D. A., and Wrucke, C. T., 1999, Geologic map of the Izzenhood

Spring quadrangle, Lander County, Nevada: U.S. Geological Survey 

Miscellaneous Investigations Map 1-2668, scale 1:24,000. (15)

Kistler, R. W., 1991, Chemical and isotopic characteristics of plutons in 

the Great Basin: Geology and Ore Deposits of the Great Basin 

Symposium, Reno 1990, Proceedings, p. 107-109.

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

Isotope variation in the Tuolumne intrusive suite, central Sierra
Nevada, California: Contributions to Mineralogy and Petrology, v. 94,

no. 2, p. 205-220. (10) 

Kistler, R. W., Ghent, E. D., and O'Neil, J. R., 1981, Petrogenesis of

garnet two-mica granites in the Ruby Mountains, Nevada: Journal of

Geophysical Research, v. 86, p. 10591-10606. (8) 

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

isotopic data for a suite of granitoid rocks from the Basin and Range

Province, Arizona, California, Nevada, and Utah: U. S. Geological

Survey Open-File Report 89-199, 13 p.(1) 

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

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

P-(13) 

Lee, D. E., Friedman, I., and Gleason, J.D., 1981, Map showing oxygen

isotope compositions of granitoid rocks of the Basin and Range

Province: U. S. Geological Survey Miscellaneous Field Studies Map

MF-1305, scale 1:3,168,000. (14) 

Lee, D. E., Kistler, R. W., and Robinson, A. C., 1986, The strontium

isotope composition of granitoid rocks of the southern Snake

Range: U. S. Geological Survey Bulletin 1622, p. 171-179. (6) 

Lowe, T.A., and Mahood, G. A., The Minarets and Merced Peak volcanicplutonic complexes of the east-central Sierra Nevada, California:

two coeval but differently sourced magmatic systems:in

preparation. (11) 

Robinson, A. C., and Kistler, R. W., 1986, Isotopic dating in the 1°x 2°

Walker Lake Quadrangle, California and Nevada: U. S. Geological

Survey Map, MF-1382N, 49 p. (12) 

Stacey, J. S., and Zartman, R. E., 1978, A lead and strontium isotopic

study of igneous rocks and ores from the Gold Hill Mining

district, Utah: Utah Geology, v. 5, p. 1-15. (4) 

Steiger, R. H., and Jager, E., 1977, Subcommission on geochronology:

Convention on the use of decay constants in geo- and

cosmochronology: Earth and Planerary Sciences letters, v. 36, p.

359-362. 

Wooden, J. L., Kistler, R. W., and Tosdal, R. M., 1998, Pb isotopic

mapping of crustal structure in the northern Great Basin and

relationships to Au deposit trends: in Contributions to the gold

metallogeny of northern Nevada, R. M. Tosdal ed, U.S. Geological

Survey Open-File Report, 98-338, p.20-33. 

Wright, J. E., and Snoke, A. W., 1993, Tertiary magmatism and

mylonitization in the Ruby-East Humboldt metamorphic core

complex, northeastern Nevada: U-Pb geochronology and Sr, Nd,

and Pb isotope geochemistry: Geological Society of America

Bulletin, v. 105, p. 935-952. (7)
Wright, J. E., and Wooden, J. L., 1991, New Sr, Nd, and Pb isotopic data 

from plutons in the northern Great Basin: Implications for 

crustal structure and granite petrogenesis in the hinterland of 

the Sevier thrust belt: Geology, v. 19, p.457-460. (2)

Zartman, R. E., 1974, Lead isotopic provinces in the Cordillera of the 

western United States and their geologic significance: Economic 

Geology, v. 69, p. 792-805.

8
Table 1. Northern Great 

Sample Number 

(x)=reference 

Alta Stock (2) 

Little Cottonwood Stock (2) 

Last Chance Stock(2) 

GR-17 ** (1) 

GR-1** (1) 

GR-15** (1) 

GR-5** (1) 

GR-11** (1) 

Notch 

GR-7**(1) 

Peak (2) 

GR-9** (1)

Newfoundland pluton (2) 

GR-3** (1) 

biotite monzogranite 

hb-bi monzogranite 

hb-bi qtz. diorite 

Red Butte 

Ibapah pluton(2) 

Ibapah pluton(2) 

GR-93** (1) 

Crater Island (2) 

Crater Island (2) 

GR-21** (1) 

GR-91 bar** (1) 

GR-91** (1) 

68-1 

18(4) 

38B(4) 

42(4) 

10(4) 

41(4) 

19(4) 

(4) 

1 5A (4) 

68-2 (4)

Basin, Sierra Nevada Pb, Sr and 

Name (State)

Wasatch Range(Utah)

Wasatch Range (Utah)

Oquirrh Range (Utah)

East Tintic (Utah)

Marysville (Utah)

Desert Mtn. (Utah)

Star Range (Utah)

Three Peaks Utah)

San Francisco Utah)

House Range (Utah)

Stoddard Mtn. (Utah)

Newfoundland Mountain (Utah)

Notch Peak (Utah)

Immigrant Pass (Utah) (3)

Immigrant Pass (Utah) (3)

Immigrant Pass (Utah) (3)

Grouse Creek Range (Utah) (3)

Deep Creek Range (Utah)

Deep Creek Range (Utah)

Gold Hill (Utah)

Silver Island Mountains (Utah)

Silver Island Mountains (Utah)

Grouse Creek (Utah)

Deep Creek (Utah)

Deep Creek (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Oxygen Isotopic Data 

DecLat DecLong 206

40.18

40.08

40.16

40.11

40.17

40.18

40.16

40.17

40.13

39.85

39.85

41.53

41.30

41.30

40.15

39.66

39.66

41.75

41.50

41.50

41.50

39.18

41.23

37.57

39.13

38.47

37.78

38.34

39.72

38.50

39.90

40.42

40.58

40.58

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

113

112

112

112

112

111

111

.83

.83

.83

.82

.82

.82

.81

.81

.79

.80

.80

.77

.75

.75

.75

.66

.66

.63

.60

.60

.60

.40

.38

.35

.33

.28

.17

.07

.60

.18

.12

.08

.65

.63

18

19

19

19

18

19

19

18

19

19

19

17

19

19

19

19

19

17

16

17

17

19

19

17

19

18

17

18

18

18

18

17

17

17

204

.668

.566

.537

.611

.731

.976

.733

.915

.568

.112

.104

.676

.636

.603

.277

.092

.108

.507

.893

.023

.749

.449

.602

.731

.061

.403

.924

.458

.839

.606

.696

.549

.600

.891

Pb

PJb

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

204

207

.761

.841

.812

.838

.772

.862

.860

.791

.812

.759

.753

.631

.793

.773

.816

.757

.778

.649

.474

.540

.643

.721

.761

.533

.722

.574

.536

.578

.634

.584

.622

.570

.560

.596

Pb

Pb

208PJb

204Rb

40.028

40.230

40.170

40.302

40.075

40.682

40.366

40.194

40.139

39.915

39.877

38.149

40.165

40.119

40.550

39.910

39.986

38.379

37.562

37.822

38.057

39.495

40.116

38.210

39.640

38.497

38.152

38.840

38.707

38.420

38.767

38.205

38.282

38.306
Table 1. Northern 

Sample Number 

(x)=reference

13A (4) 

70-2 

6(4) 

5A(4) 

(4) 

GR-23** (1) 

M80PR-19 (2) 

Uvada (2) 

Skinner Canyon (2) 

PBG-Km-42 (2) 

20-210 (2) 

Old Man tonalite (2) 

BFU Silver Creek (2) 

GR-47** (1) 

M80TR-01 (2) 

M84TR-81 (2) 

Young Canyon (2) 

PBGKm-71 (2) 

KTG (2) 

PBG-T7 (2) 

PBG4039 (2) 

16-72-3 (2) 

GR-123** (1) 

White Horse pluton 

51-053-15 

N9C-83 

N9-83 

(2) 

GR-25** (1) 

M83TR-36 (2) 

biot. granodiorite (2) 

WC-2 (2) 

GR-119** (1) 

N14-83

N11-83 

GR-125** 

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic data (cont.) 

Name (State)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Gold Hill (Utah)

Pilot Range (Utah)

Miners Spring (Utah)

Kem Mountains (Nevada)

Kern Mountains (Nevada)

Skinner Canyon Kem Mountains (Nevada)

Snake Range-Horse Canyon (Nevada)

Snake Range (nevada)

Snake Range (nevada)

Lexington Creek pluton (Nevada)

Toano Springs 2-Mica granite (Nevada)

Toano Springs 2-mica granite (Nevada)

Snake Range (Nevada)

Tungstonia Granite, Kern Mtns. (Nevada)

Tungstonia Granite, Kern Mtns. (Nevada)

Tungstonia Granite, Kern Mtns. (Nevada)

Tungstonia Granite, Kern Mtns. (Nevada)

Snake Creek pluton, Snake Range (Nevada)

White Horse gran., Goshute Range

Goshute Range (Nevada) (2)

White Horse gran., Goshute Range

White Horse gran., Goshute Range

Osceola pluton, Snake Range (Nevada)

Toano Springs, 2-mica granite (Nevada)

bi. granodiorite, Silver Zone Pass

Silver Zone Pass (Nevada)

Willard Creek gran., Snake Range

Wilson Creek Range (Nevada)

Dolly Varden pluton (Nevada)

Dolly Varden pluton (Nevada)

Dolly Varden pluton (Nevada)

DecLat DecLong 206

40.34

40.34

40.35

38.30

39.03

40.90

40.90

41.00

39.07

40.27

40.27

40.27

40.27

38.93

39.70

39.70

39.70

39.70

38.97

41.00

41.00

38.85

39.15

39.25

39.25

39.75

39.75

39.75

41.00

41.23

40.19

40.19

40.18

40.16

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

114

113

113

113

113

.59

.56

.55

.47

.36

.30

.30

.30

.28

.28

.28

.28

.28

.25

.20

.20

.20

.20

.20

.20

.20

.20

.17

.17

.13

.08

.08

.08

.00

.00

.88

.85

.83

.83

19

19

19

18

19

19

19

19

19

19

19

19

19

19

19

19

18

19

18

19

19

18

19

19

19

18

18

19

19

17

18

18

18

19

204

.506

.651

.615

.153

.262

.960

.953

.723

.187

.557

.582

.584

.840

.241

.065

.003

.981

.284

.228

.556

.684

.746

.574

.231

.010

.551

.561

.463

.712

.763

.713

.658

.685

.645

Pb

Pb

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

204

207

.744

.791

.777

.571

.723

.763

.781

.939

.729

.751

.763

.760

.757

.712

.792

.786

.781

.739

.664

.903

.958

.631

.766

.752

.673

.685

.651

.759

.814

.554

.774

.758

.726

.832

Pb

EM

39

40

39

39

39

39

40

41

39

39

39

39

39

39

40

40

40

39

39

40

41

39

39

39

38

39

39

39

39

37

40

39

39

40

204

208

.675

.088

.979

.098

.240

.962

.003

.146

.321

.774

.747

.720

.496

.292

.177

.202

.085

.443

.286

.900

.126

.105

.563

.665

.910

.509

.563

.729

.865

.714

.079

.996

.908

.173

Pb

Pb

10
Table 1. Northern 

Sample Number 

(x)=reference

M81 PR-82 (2) 

M79PR-116 (2) 

GR-128** (1) 

PBG-107 (2) 

Aurum (2) 

GR-57** (1) 

Contact pluton (2) 

Melrose pluton (2) 

EC-1 (2) 

WS-1 (2) 

Heusser Mtn. (2) 

GR-19** (1) 

Ch-C#2 (2) 

GR-45** (1) 

RM-13 (7) 

Angel Lake (7) 

RM-5 (7) 

AL-2 (7) 

RM-12 (7) 

RM-19 (7) 

RM-7 (7) 

RM 11 (7) 

RM-4 (7) 

RM-17 (7) 

RM-15 (7) 

GR-81** (1) 

GR-85** (1) 

Dawley Canyon (2) 

Lamoille Canyon (8) 

R-2 (8) 

RM-17-66 (8) 

J-1 Plagioclase (8) 

J-1 K-feldspar (8) 

RM-10 (8)

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic data (cont.) 

Name (State)

Bettridge Creek Granodiorite (Utah) 

McGinty Monzogranite Utah) 

Blind Mountain pluton (Nevada) 

Schell Creek Range (nevada) 

Schell Creek Range (Nevada) 

Contact Ruton (Nevada) 

Granite Range (Nevada) 

Dolly Varden Mountains (Nevada) 

Egan Canyon, Cherry Creek Range (NV) 

Warm Springs, Egan Range (Nevada) 

Egan Range (Nevada) 

Huesser mountain (Nevada) 

Cherry Creek Range (Nevada) 

Warm Springs, Egan Range (Nevada) 

E. Humbddt Range (Nevada) 

E. Humbddt Range (Nevada) 

Angel Lake, East Humboldt Range (Nevada) 

Angel Lake, East Humbddt Range (Nevada) 

East Humbddt Range (Nevada) 

East HJumboldt Range (Nevada) 

East Humbddt Range (Nevada) 

Secret Peak, East Humboldt Range (NV) 

Lamoille Canyon, Ruby Range (Nevada) 

Lamoille Canyon, Ruby Range (Nevada) 

Lamoille Canyon, Ruby Range (Nevada) 

Silver Springs, White Pine Range (Nevada) 

Harrison Pass pluton, Ruby Range (NV) 

Ruby Range (Nevada) 

Ruby Range (Nevada) 

Jurassic granite, Ruby Range (Nevada) 

Dawley Canyon, Ruby Range (Nevada) 

Jurassic granite,Ruby Range (Nevada) 

Jurassic grtanite,Ruby Range (Nevada) 

Jurassic granite, Ruby Range (Nevada) 40.33

40.37

40.37

40.37

40.37

40.66

40.37

40.33

38.85

40.66

40.66

40.64

40.82

40.82

41.00

40.76

41.03

41.03

41.03

40.80

39.63

39.50

39.40

39.40

39.63

39.50

40.27

41.73

41.75

39.00

39.50

37.98

41.19

41.10

DecLat

1 

114.01

DecLong

1 4.00

1 

114.90

114.83

114.87

114.87

114.90

114.83

114.78

114.78

114.77

114.75

114.75

114.62

1 5.07

1 1 5.09

1 1 5.09

1 1 5.09

1 1 5.09

1 1 5.09

1 

115.41

115.37

115.26

115.12

1 5.44

1 

115.40

115.50

115.48

1 5.44

1 

115.50

1 5.40

115.50

115.50

115.50

206P_b

204p b

19.940

19.785

19.867

19.698

19.263

19.487

19.792

19.318

19.434

19.232

19.150

19.586

19.252

18.279

17.816

19.270

18.273

19.558

18.228

19.208

19.250

19.308

19.030

19.064

18.987

19.354

19.802

19.779

19.799

19.016

19.064

18.560

17.736

18.451

207Pb

204p b

15.768

15.746

15.787

15.768

15.788

15.769

15.773

15.754

15.709

15.711

15.672

15.793

15.918

15.757

15.627

15.776

15.738

15.929

15.762

15.755

15.763

15.818

15.687

15.714

15.752

15.865

15.804

15.746

15.741

15.770

15.715

15.585

15.563

15.764

208Pb

204p b

39.634

39.303

39.418

39.231

39.988

39.775

39.373

39.730

39.275

39.580

38.943

39.758

40.548

39.958

39.012

39.646

39.419

40.688

39.038

39.731

40.144

40.560

39.574

39.672

40.115

40.756

40.404

39.709

39.458

40.073

39.679

39.073

37.949

38.343

11
Table 1. Northern Great 

Sample Number 

(x)=reference)

GR-83** 

S123-8

S119-8

S121-8

(1)

GR-205** (1)

GR-27** (1)

GR-117** (1)

RM-8 (7)

GR-97** (1)

GR-29** 

S117-8

(1)

NEP-1 

S126-8

NS1-9

NS1D-9

6

GR-31** (1)

GR-32** (1)

GR-59** 

S125-8

(1)

GR-35** (1)

SI 27-8

GR-60** (1)

GR-103** 

N16-83

NS2-9

NS3-9

(1)

GR-105** (1)

N31-83 Cottonwood Can.

N30-83 Cottonwood Can.

Cottonwood Canyon

N29-83 Cottonwood Can.

GR-95** (1)

NS5-9

NS4-9

Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic data (cont.) 

Name (State)

White Pine Peak, (Nevada)

Little Bald Mountain (Nevada)

Mt. Hamilton (Nevada)

Grant Range, Troy Canyon (Nevada)

Worthington Mtn. (Nevada)

Coffee Pot pluton (Nevada)

Tempiute, (Nevada)

Harrison Pass pluton, Ruby Range(Nevada)

Da vis Canyon, Eureka County (Nevada)

Diamond Peak (Nevada)

Golden Ensign pluton (Nevada)

SE Independence Mountains (Neveda)

Independence Mountains (Nevada)

Ruby Hill SW of Eureka (Nevada)

Oligocene grd

Columbia Stock (Nevada)

Columbia Stock (Nevada)

Whistler Mtn aplite (Nevada)

White Rock pluton (Nevada)

Wood Cone Peak (Nevada)

Wood Cone Peak (Nevada)

White Rock pluton (Nevada)

Buck Rake, S. Tuscarora Mtns. (Nevada)

Northern Tuscarora Mtns. (Nevada)

Duff Creek pluton, Cortez Mtns. (Nevada)

Cortez Mountains (Nevada)

Cortez Mountains (Nevada)

granodiorite, Cortez Mtns. (Nevada)

granodiorite, Cortez Mtns. (Nevada)

granodiorite, Cortez Mtns. (Nevada)

granodiorite, Cortez Mtns. (Nevada)

Simpson Park Mountains (Nevada)

SW Cortez Mountains (Nevada)

Shoshone Range (Nevada) 40.41

40.20

39.92

40.27

40.27

40.27

40.26

40.33

40.37

40.34

41.33

40.61

41.72

39.38

39.38

41.70

39.66

41.68

41.68

40.58

39.50

41.12

41.12

41.82

40.02

40.02

40.45

37.65

41.80

37.93

38.35

39.25

39.95

38.86

DecLat

1 

115.58

115.56

115.56

115.50

DecLong

1 5.60

116.78

116.60

116.55

116.45

116.45

116.45

116.44

116.40

116.35

116.35

116.33

116.26

116.17

116.15

116.15

116.15

116.09

116.08

116.07

116.02

115.99

115.96

115.96

115.93

115.84

115.83

115.66

115.63

115.63

206£b

Z04p b

19.335

19.445

19.356

19.675

19.832

19.636

24.996

18.929

19.523

21.354

19.094

19.905

19.678

19.549

19.504

19.844

19.419

19.221

19.104

19.193

19.321

18.672

19.193

18.928

19.525

19.335

18.926

19.151

18.984

19.175

18.807

19.426

19.556

19.363

207p_b

204p b

1 

15.792

15.692

15.661

15.644

15.762

15.674

15.699

15.663

15.623

15.702

15.684

15.818

15.658

15.630

15.651

15.632

15.728

15.777

15.703

5.706

15.681

15.715

15.684

15.726

15.711

15.694

15.960

15.669

15.713

15.835

15.679

15.731

15.780

15.729

208p b

204Rb

39.038

39.031

39.004

39.291

39.330

39.299

46.898

38.777

38.952

40.769

39.105

39.647

39.402

39.270

39.090

39.217

39.001

38.955

38.830

39.608

38.807

39.244

38.810

38.652

39.229

39.025

40.306

38.695

38.553

39.008

38.909

39.050

39.345

39.192

12
Table 1. Northern 

Sample Number 

(x)=reference

GR-113** (1)

GR-111** 

82DJ-181E

(1)

Birch 

N4-83

N5-83

Cr. pluton (2)

Iowa pluton (2)

Austin pluton (2)

GR-109** (1)

Round 

82DJ-190

Mtn. (2)

DLS 

N6-83

N8-83

86-119 (2)

Aiken Creek (2)

DLS 86-166 (2)

GR-107** 

NS10-9

(1)

Fraziers 

N3-83

Well (2)

NS6-9 

NS6-9

(duplicate)

DLS 

NS7-9

NS9-9

86-182 (2)

DLS 86-234 (2)

N32-83 

N32-83

82DJ-272

82DJ-243

bar

Buffalo 

N33-83

Mountain (2)

N33-83 bar

N1-83

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic Data (cont.) 

Name (State)

Northumberland, Toquima Range (Nevada) 

Northumberland, Toquima Range (Nevada) 

Belmont pluton, Toquima Range (Nevada) 

Belmont pluton II, Toquima Range (Nevada) 

Belmont pluton I.Toquima Range (Nevada) 

two mica granite, Toiyabe Range (Nevada) 

granodiorite, Toiyabe Range (Nevada) 

granodiorite, Toiyabe Range (Nevada) 

Pipe Springs pluton, Toquima R. (Nevada) 

North Round Mtn., Toquima Range (NV) 

monzogranite, Toquima Range (Nevada) 

Round Mtn. pluton, Toquima Range (NV) 

Pipe Springs pluton, Toquima R. (Nevada) 

Carseley Cr. gran., Toiyabe R. (Nevada) 

granodiorite, Toiyabe Range (Nevada) 

Timblin Ck. granite, Toiyabe R. (Nevada) 

Trenton Canyon stock, Battle Mtn. (NV) 

Black Mtn., San Antonio Mtn. (Nevada) 

Black Mtn., San Antonio Mtn. (Nevada) 

Black Mtn., San Antonio Mtn. (Nevada) 

McCoy stock, Fish Creek Mtn. (Nevada) 

McCoy stock, Fish Creek Mtns. (Nevada) 

Osgood Mountains stock (Nevada) 

Cain Creek stock, Shoshone Mtns. (NV) 

Ophir pluton, Toiyabe Range (Nevada) 

Ravenwood pluton, Shoshone R. (Nevada) 

Ophir pluton, Toiyabe Range (Nevada) 

Jett Canyon dike, Toiyabe Range (Nevada) 

hbde-biot. grano., Edna Mtns. (Nevada) 

hbde-biot. grano., Edna Mtns. (Nevada) 

Buffalo Mountain syenite (Nevada) 

syenite (Nevada)

Buffalo Mountain syenite (Nevada) 

Lone Mountain pluton (Nevada) 38.02

40.71

40.70

40.70

40.82

40.82

38.72

38.95

39.75

38.95

40.01

41.18

40.30

40.30

38.15

38.15

38.15

40.63

39.00

39.16

39.33

38.49

38.70

38.72

38.72

38.52

39.50

39.83

39.50

38.56

38.60

38.57

38.96

38.95

DecLat

117.47

117.45

117.45

117.45

117.44

117.44

117.33

117.32

117.30

117.30

117.27

117.27

117.24

117.24

117.22

117.22

117.20

117.20

117.16

117.08

117.08

117.07

117.03

117.02

117.02

117.02

117.00

117.00

116.92

116.91

116.90

116.88

116.87

116.83

DecLong

206P_b

204p b

19.011

19.318

19.430

19.322

19.298

19.316

19.164

18.967

19.060

19.079

19.489

19.073

19.544

19.527

19.254

19.254

19.020

19.191

19.051

18.992

19.324

19.073

19.155

19.131

19.230

19.090

19.250

19.302

19.188

19.159

19.212

18.953

19.215

19.056

207Pb

zo4pb

15.664

15.678

15.693

15.678

15.681

15.687

15.660

15.630

15.635

15.653

15.718

15.685

15.719

15.713

15.696

15.696

15.678

15.674

15.657

15.645

15.688

15.654

15.680

15.669

15.660

15.636

15.677

15.689

15.687

15.671

15.669

15.653

15.673

15.639

208 P_b

204p b

38.879

38.913

39.035

38.917

38.889

38.939

38.866

38.621

38.731

38.745

39.058

38.867

39.125

39.090

38.835

38.835

38.781

38.838

38.734

38.706

38.998

38.790

38.883

38.849

38.879

38.677

38.875

38.940

38.951

38.842

38.900

38.769

38.817

38.584

13
Table 1. Northern 

Sample Number 

(x)=reference

NS8A-9 

NS8A-9 

bar 

GR-49** 

NS8B-9 

(1) 

Tobin 

84DJ-167 

(9) 

GR-79** 

82DJ-119 

(1) 

GR-77** (1) 

P4K-7 (9) 

P4K8 (9) 

P4K12 (9) 

P2K8 (9) 

P2K5 (9) 

P3K1 (9) 

P3K3 (9) 

G.Mtn. 

82DJ-74 

(9) 

G.Mtn. (9) 

GR-51** (1) 

P6K8 

82DJ-72 

(9) 

P4K4 (9) 

P4K1 (9) 

PI K3 (9) 

P1K1 (9) 

P5K5 (9) 

P5K1 

82DJ-14 

(9) 

GR-87** 

S94-6

NS13-9 

(1) 

GR-43** (1) 

GR-53** (1)

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic Data (cont.) 

Name (State)

SW Fish Creek Mountains (Nevada) 

SW Fish Creek Mountains (Nevada) 

SW Fish Creek Mountains (Nevada) 

Weepah pluton (Nevada) 

Crow Springs, SW Royston Hills (Nevada) 

S. Tobin Range (Nevada) 

Orizaba Mine, N. Royston Hills (Nevada) 

Santa Rosa pluton (Nevada) 

Bloody Run pluton (Nevada) 

Lee Peak pluton, East Range (Nevada) 

Lee Peak pluton, East Range (Nevada) 

Lee Peak pluton, East Range (Nevada) 

Goldbank A pluton, East Range (Nevada) 

Goldbank A pluton, East Range (Nevada) 

Goldbank B pluton, East Range (Nevada) 

Goldbank B pluton, East Range (Nevada) 

North Cedar Mountain pluton (Nevada) 

Granite Mtn, S. East Range(Nevada) 

Triassic pluton, S. East Range (Nevada) 

Palmetto Wash pluton (Nevada) 

North Cedar Mountain pluton (Nevada) 

Grass Valley pluton, East Range (Nevada) 

Lee Peak pluton, East Range (Nevada) 

Lee Peak pluton, East Range (Nevada) 

Rockhill Can. pluton, East Range (Nevada) 

Rockhill Can. pluton, East Range (Nevada) 

Rose Creek pluton, East Range (Nevada) 

Illinois, Tonapah

Rose Creek pluton, East Range (Nevada) 

New York Can., N.Stillwater Range (NV) 

granodiorite pluton, Eugene Mtns. (NV) 

granodiorite, Diaster Peak area (Nevada) 

IxL Canyon, Stillwater Range (Nevada) 

Garfield Hills pluton, (Nevada)

DecLat DecLong z06

38.40

39.67

41.93

40.78

40.05

40.85

38.98

40.85

40.63

40.63

40.57

40.57

40.85

38.56

37.53

40.30

40.30

38.55

40.54

40.54

40.57

40.57

40.57

40.57

40.57

41.17

41.55

38.51

40.21

38.24

37.95

40.17

40.17

40.17

118.23

118.22

118.20

118.13

118.01

117.89

117.91

117.89

117.88

117.88

117.85

117.85

117.84

117.83

117.80

117.80

117.80

117.80

117.77

117.77

117.76

117.76

117.75

117.75

117.75

117.73

117.65

117.62

117.61

117.54

117.52

117.47

117.47

117.47

20

19

18

18

19

19

19

19

19

19

19

19

19

19

18

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

19

204

.020

.045

.739

.877

.028

.433

.040

.381

.374

.500

.484

.402

.380

.068

.723

.880

.104

.012

.442

.424

.466

.495

.395

.439

.430

.016

.016

.167

.370

.374

.224

.210

.203

.190

Pb

P_b

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

15

204

207

.779

.630

.585

.641

.649

.657

.619

.687

.701

.711

.740

.708

.697

.638

.641

.731

.647

.642

.717

.710

.752

.720

.745

.697

.724

.634

.626

.668

.688

.711

.654

.653

.665

.659

Pb

Pb

38

38

38

38

38

38

38

39

39

39

39

39

38

38

38

39

38

38

39

39

39

39

39

39

39

38

38

38

39

38

38

38

38

38

204

208

.999

.701

.411

.640

.756

.944

.617

.033

.251

.215

.184

.118

.990

.756

.602

.484

.815

.728

.048

.017

.200

.191

.295

.099

.180

.650

.621

.888

.103

.945

.964

.893

.913

.885

Pb

Pb

14
Table 1. Northern 

Sample Number 

Rocky 

S93-6

87DJ-146 

(x)=reference

South (9) 

Rocky North (9) 

GR-89** (1) 

Imlay (9)

GR-41** 

87DJ-153 

87DJ-157 

595-6 

(1)

Trinity 

596-6

3 (9) 

Trinity 1 (9) 

Trinity 2 (9) 

SI 02-6 

Lone (9) 

GR-99** 

S98-6

(1) 

GR-100** (1) 

Eagle (9) 

GR-121** 

S107-6 

(1) 

GR-55** 

S113-6 

(1) 

7 

S111-6 

S97A-6 

Troughs (1) 

GR-65** 

87DJ-142

87DJ-130

S30-9

S100-6

5110-6

5109-6

S131-7

(1)

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic Data (cont.) 

Name (State)

Slate Mountain (Nevada)

Rocky Can. pluton, Humboldt Range (NV)

Rocky Can. pluton, Humboldt Range (NV)

Rocky Can. pluton, Humboldt Range (NV)

Rye Patch Reservoir (Nevada)

S. end Eugene Mountains (Nevada)

S. end Eugene Mountains (Nevada)

Eagleville pluton (Nevada)

N. Scheelite pluton (Nevada)

Sand Springs Range (Nevada)

W.of Rye Patch Reservoir (Nevada)

N. Trinity Range pluton (Nevada)

Trinity Range pluton (Nevada)

Trinity Range pluton (Nevada)

Lone Mtn. pluton, Trinity Range (Nevada)

Lone Mtn. pluton, Trinity Range (Nevada)

N.end of Trinity Range (Nevada)

Eagle.Trinity Range (Nevada)

Eagle, Trinity Range (Nevada)

Trinity Range (Nevada)

Eagle, Trinity Range (Nevada)

Pine Forest Range (Nevada)

S. Trinity Range (Nevada) 

Wassuk Range pluton (Nevada) 

Stonehouse Can., 7 Troughs Range (NV)

Trinity Range (Nevada) 

7 Troughs Range (Nevada)

Pahsupp Mtn. area (Nevada) 

N. Shawave Mountains (Nevada) 

Lovelock, Shawave Mtns (Nevada) 

Trinity Range (Nevada) 

Masonic pluton (Nevada) 

Nightingale dist., Truckee Range (Nevada) 

Nightingale dist., Truckee Range (Nevada) 

Selenite Range (Nevada)

DecLat DecLong 206P_b

40.43

39.90

40.00

38.37

40.38

40.13

40.31

40.61

40.55

40.17

40.52

38.45

40.01

41.70

40.29

40.29

40.28

40.28

40.45

40.19

40.18

40.38

40.40

40.48

40.58

39.13

39.03

39.01

40.70

40.70

40.70

40.38

40.38

40.41

39.13

1 

118.63

118.63

118.62

118.55

118.55

118.54

118.45

118.51

118.37

118.41

118.35

118.33

118.26

118.25

118.25

118.25

118.24

118.24

118.24

118.24

1 8.64

119.27

119.25

119.23

119.12

118.48

119.07

119.02

119.00

118.81

118.77

118.76

118.75

118.70

118.70

204pb

1 8.900

1 

18.968

19.099

19.130

19.086

8.944

1 

18.964

18.905

8.900

1 

18.832

18.907

19.087

18.853

18.832

18.862

18.898

19.013

19.129

18.885

18.826

18.886

19.003

18.850

18.949

18.847

18.986

8.847

18.814

18.867

18.802

18.995

18.841

18.860

18.819

19.041

207Pb

204p b

15.596

15.612

15.599

15.651

15.626

15.630

15.626

15.665

15.623

15.620

15.626

15.637

15.634

15.604

15.634

15.642

15.625

15.621

15.649

15.629

15.622

15.635

15.620

15.643

15.654

15.628

15.622

15.645

15.640

15.643

15.635

15.662

15.671

15.660

15.625

208P_b

204Pb

38.346

38.585

38.458

38.764

38.569

38.601

38.528

38.774

38.560

38.558

38.584

38.662

38.620

38.437

38.630

38.676

38.530

38.532

38.664

38.581

38.584

38.634

38.555

38.702

38.709

38.600

38.612

38.479

38.649

38.663

38.514

38.826

38.867

38.805

38.576

15
Table 1. Northern

Sample Number

GR-76** 

S24-3

S86-4

S82-2

S113-2

(x)=reference

(1)

GR-75** (1)

GR-63** 

89DJ-70

89DJ-69

S38-7

S8-5

S10-5

89DJ-84

S70-2

89DJ-64

89DJ-102

S35-8

S5-3

87DJ-174

S111-2

S71-2

S77-2

S23-9

S36-3

S49-3

S64-2

89DJ-100

S20-9

(1)

SI 3-5

GR-64** (1)

SI 

89DJ-74

5-5

SI 6-5

SI 

S25-5

7-5

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic data (cont.) 

Swauger 

Name

Location 

Creek pluton (Calif.) 

Log Cabin Creek pluton (Calif.) 

Eagle Creek pluton (Calif.) 

S.Taylor Valley pluton (Calif.) 

Granite Range pluton (Nevada) 

Granite Range pluton (Nevada) 

Devils Gate pluton (Calif.) 

Fulstone volcanic porphyry (Nevada) 

main Desert Creek pluton (Calif.) 

Desert Creek Diorite (Calif.) 

Desert Creek Porphyry (Calif.) 

Rock Creek pluton (Calif.) 

Sonora Bridge pluton (Calif.) 

Mill Creek pluton (Calif.) 

China Garden pluton (Calif.) 

SE Virginia Range (pluton) 

Slinkard Valley pluton (Calif.) 

Sonora Pass, Lertora Lake pluton (Calif.) 

Sunrise Pass pluton (Nevada) 

Yerington pluton (Nevada) 

White Mountain pluton (Calif.) 

Mt. Siegel pluton (Nevada) 

Upper Twin Lake pluton (Calif.) 

Avonelle Lake pluton (Calif.) 

Sonora Pass, Maxwell Lake pluton (Calif.) 

Mount Siegel pluton (Nevada) 

Mount Siegel pluton (Nevada) 

Pah Rah Range pluton (Nevada) 

Lower Twin Lake pluton (Calif.) 

Pah Rah Range pluton (Nevada) 

Prison Hill pluton (Nevada) 

Lower Twin Lake pluton (Calif.) 

Lower Twin Lake pluton (Calif.) 

Lower Twin Lake pluton (Calif.) 

Boundary Lake, Lake Vernon pluton (Calif.) 38.11

38.13

38.13

38.13

39.11

39.80

38.14

39.80

39.06

39.06

38.17

38.12

38.15

38.98

38.35

39.05

39.09

38.24

38.64

39.33

38.53

38.39

38.37

38.49

38.54

38.59

38.58

39.06

38.35

40.68

40.67

38.56

38.21

38.22

38.34

DecLat

119.71

119.70

119.70

119.69

119.68

119.68

119.68

119.67

119.66

119.66

119.66

119.66

119.64

119.58

119.58

119.55

119.54

119.54

119.54

119.49

119.49

119.49

119.48

119.45

119.43

119.42

119.42

119.42

119.38

119.38

119.37

119.37

119.36

119.32

119.32

DecLong

206Pb

204p b

1 

18.749

19.258

18.691

18.927

18.988

19.062

19.195

19.326

18.930

19.045

18.846

18.739

19.041

18.917

18.785

19.037

18.935

19.082

18.954

19.665

18.844

19.047

19.000

18.934

18.853

18.893

18.866

18.970

18.923

18.908

8.801

19.207

19.193

19.257

19.268

207£b

204Pb

15.695

15.679

15.721

15.718

15.607

15.595

15.715

15.597

15.623

15.627

15.698

15.676

15.723

15.611

15.683

15.631

15.610

15.659

15.647

15.611

15.638

15.662

15.647

15.645

15.672

15.614

15.643

15.625

15.634

15.601

15.607

15.616

15.658

15.636

15.617

208Pb

204Pb

38.905

38.873

39.008

38.981

38.486

38.356

38.956

38.377

38.578

38.682

38.885

38.850

39.008

38.517

38.806

38.622

38.454

38.741

38.696

38.532

38.707

38.758

38.768

38.703

39.189

38.612

38.783

38.925

38.632

38.430

38.408

38.582

38.699

38.624

38.568

16
Table 1. Northern

Sample Number

SI 

S31-5

S11-7

S25-0

S77-4

S87-3

S14-2

S16-2

S86-3

82-DJ-316

87DJ-185

S36-4

S28-4

S11-4

S1-4

S59-4

S24-8

S18-5

S26-5

(x)=reference

38-7

SI 

S23-0

S67-3

S64-3

S18-2

S49-2

50-7

SI 55-7

SI 

S161-7

S141-7

S142-7

S144A-7

5144-7

5143-7

S162-7

S154-7

39-7

Great Basin, Sierra Nevada Pb, Sr and Oxygen Isotopic Data (cont.) 

Name (State)

Boundary Lake, Lower Twin Lake (Calif.) 

Mahan Peak pluton (Calif.) 

Sonora Pass, Lertora Lake pluton (Calif.) 

Topaz Lake pluton, Kennedy Mead. (Calif.) 

Boundary Lake pluton (Calif.) 

Wire Lakes pluton (Calif.) 

Whitesides Meadow pluton (Calif.) 

Outer Boundary Lake pluton (Calif.) 

Dogskin Mountain pluton (Nevada) 

Kinney Lakes pluton (Calif.) 

Stanislaus Meadow pluton (Calif.) 

Lookout Peak pluton (Calif.) 

Ebbetts Pass pluton (Calif.) 

Stanislaus Meadow pluton (Calif.) 

Kinney Lakes pluton (Calif.) 

Stanislaus Meadow pluton (Calif.) 

Sonora Pass, Bull Run Lake pluton (Calif) 

Bummers Flat pluton (Calif.)

McFaul Creek pluton (Nevada) 

Cascade Creek pluton (Calif.) 

Outer Niagara Creek pluton (Calif.) 

Outer Niagara Creek pluton (Calif.) 

Inner Niagara Creek pluton (Calif.) 

Big Meadow pluton (Calif.)

W. of Meeks Bay (Calif.)

Cold Creek, Highway 40 (Calif.) 

Lake Tahoe area, Summit Lake (Calif.)

Granite Chief pluton (Calif.) 

Loon Lake area (Calif.) 

Loon Lake area (Calif.) 

Loon Lake area (Calif.) 

Loon Lake area (Calif.) 

Loon Lake area (Calif.)

Forest Hill Divide, NW Lyon Peak(Calif.) 

Loon Lake area, Gabbro (Calif.)

DecLat DecLong 206Pb

38.97

39.22

38.97

38.97

38.99

38.99

38.97

39.19

39.36

39.32

39.05

38.41

38.41

38.40

38.48

38.28

39.00

38.31

38.49

38.51

38.35

38.52

38.54

38.50

38.54

38.24

39.81

38.13

38.17

38.16

38.15

38.32

38.14

38.10

38.12

1 

120.03

119.99

119.97

119.95

119.94

119.94

119.92

119.91

119.90

119.90

119.89

119.87

119.83

119.81

119.80

119.79

119.78

119.77

119.75

119.72

119.72

119.71

20.04

120.33

120.33

120.33

120.33

120.33

120.33

120.33

120.32

120.31

120.29

120.18

120.12

204p b

19.075

18.896

19.198

19.148

19.107

19.139

19.150

18.828

18.823

18.847

19.036

19.166

19.084

19.133

19.128

19.191

18.921

19.135

19.092

19.029

19.036

19.033

19.061

19.057

19.112

19.036

18.798

19.227

19.177

19.053

19.217

18.918

19.030

19.171

19.312

207P_b

204Pb

15.692

15.644

15.675

15.672

15.693

15.687

15.683

15.632

15.614

15.645

15.661

15.688

15.677

15.679

15.684

15.695

15.632

15.657

15.685

15.670

15.680

15.682

15.666

15.646

15.697

15.674

15.632

15.713

15.698

15.677

15.697

15.639

15.654

15.697

15.718

208Pb

204Pb

39.018

38.691

39.067

39.060

39.133

39.190

39.071

38.595

38.537

38.641

38.865

38.923

38.822

38.842

38.854

38.903

38.644

38.778

38.959

38.837

38.820

38.879

38.811

38.798

38.970

38.800

38.532

38.967

38.902

38.802

38.911

38.676

38.730

38.907

39.018

17
Table 1. Northern 

Sample Number 

SI 

S139A-7 

(x)=reference

58-7 

SI 63-7 

SI 

S160-7 

83-7 

SI 

S169-7 

82-7 

Z-10 

S59-0 

SCg-1 

SCc-1 

S178-7 

S179-7 

SCc-19 

(10) 

Z-14 (10) 

Z-54 (10) 

FD-13 (10) 

MC-113F 

COBA-6-2 

(11) 

MC-122F (11) 

MC-274F (11) 

MC-276F (11) 

MC-278F (11) 

MC-280F (11) 

MC-281F (11) 

MC-298F (11) 

MC-299F (11)

#14 Groundmass

#17 megacryst

#80 whole-rock

Great Basin, Sierra Nevada Pb, Sr and 

Name (State)

Loon Lake area (Calif.)

White Rock Lake pluton (Calif.)

The Cedars pluton (Calif.)

Serena Creek diorite (Calif.)

White Rock Lake pluton (Calif.)

Lily Pond pluton (Calif.)

French Lake pluton (Calif.) 

Omo Ranch pluton (Calif.)

Downey Lake pluton (Calif.) 

Grouse Ridge pluton (Calif.) 

Pino Grande pluton (Calif.) 

N.Y. Ranch pluton (Calif.)

Pino Grande pluton (Calif.) 

Cathedral Peak Granodiorite (Calif.) 

Inner Half Dome Granodiorite (Calif.) 

Outer Half Dome Granodiorite (Calif) 

Quartz diorite of Glacier Point (Calif.) 

Tonalite, Cordell Bank (offshore Calif.) 

Post Peak pluton (Calif.) 

Jackass pluton (Calif.) 

Red Peak pluton (Calif.) 

Timber Knob pluton (Calif.) 

metavolc. rock Merced Peak quad (Calif. 

Morris Creek pluton (Calif.) 

pre-ignimbrite (Calif.) 

post-ignimbrite (Calif.) 

Shellenberger pluton (Calif.) 

Santa Rita Flat Pluton (Calif.) 

Santa Rita Flat Pluton (Calif.) 

Santa Rita Flat Pluton (Calif.)

Oxygen Isotopic Data (cont.)

DecLat DecLong 206

38.90

38.90

38.90

37.62

37.67

37.75

37.77

37.61

37.58

37.63

37.66

37.62

37.76

37.72

37.86

37.88

37.88

38.90

38.39

38.91

39.39

39.40

38.58

39.42

39.37

39.42

39.28

39.25

39.34

38.97

118

118

118

119

119

119

119

119

119

119

119

119

123

119

119

119

119

120

120

120

120

120

120

120

120

120

120

120

120

120

.19

.19

.19

.17

.18

.18

.19

.38

.31

.42

.29

.38

.13

.57

.48

.33

.41

.67

.65

.61

.61

.59

.55

.54

.42

.39

.38

.35

.33

.33

18

18

18

18

18

19

19

19

19

19

19

19

18

18

19

18

18

18

18

18

18

18

18

18

18

19

19

18

18

19

204

.690

.666

.718

.897

.959

.000

.064

.135

.049

.366

.086

.109

.896

.995

.019

.797

.804

.881

.800

.907

.773

.815

.969

.930

.878

.009

.010

.959

.946

.034

Pb

Pb

207PJb

204p b

15.639

15.641

15.656

15.616

15.623

15.632

15.651

15.671

15.657

15.710

15.673

15.673

15.645

15.651

15.668

15.629

15.641

15.637

15.601

15.636

15.562

15.651

15.621

15.657

15.620

15.641

15.643

15.679

15.645

15.657

38

38

38

38

38

38

38

38

38

39

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

38

204

208

.803

.811

.896

.672

.720

.762

.821

.841

.788

.006

.838

.846

.646

.729

.790

.649

.685

.768

.544

.796

.445

.683

.671

.779

.614

.794

.750

.846

.754

.932

Pb

Pb

18
Table 2. Northern 

Sample Number 

H96-59 

(x)=reference

(1)

DB-19-WM 

NEI-9 

NEI-8 

(14)

96DJ-65 

NEP-19 

(15) 

96DJ-62 (15) 

H96-80 (14) 

H96-72 (14) 

H96-104 

NEP-20 

(14) 

H96-19 (14) 

96DJ-81 (15) 

Type II 

H96-98 (14) 

92DJ-92 

BS95-U.4 

(16) 

Stebbins 

H95-63 

H95-116 

Hill 

Enright Hill 

D-68

H93-108 

CC-135A 

CC-137 

H93-114 

CC-141 

H95-71 

Northumberld 

H94-33 

H94-31 

H95-120 

Great Basin Pb Isotopic data 

Tuscarora 

Name

rhyolite dome, Dry Creek

Tuscarora 

Mtns.

Mountains, monzodiorite

Tuscarora Mountains, monzodiorite

Tuscarora, rhyolite dome, Dry Creek

Cortez 

Mtns.

Mountains, monzodiorite

rhyolite porphyry, Sheep Creek Range

porphyritic dacite, Sheep Creek Range

Tuscarora- rhyolite tuff, Dry Creek Mtns.

Tuscarora - grano., Dry Creek Mtns.

granite, Simpson Park Mtns.

Tuscarora - adularia, Dry Creek Mtns.

Tuscarora - rhy. dike, Dry Creek Mtns.

Izzenhood Spring, rhyolite porphyry

Round Mountain, adularia

Tuscarora - adularia, Dry Creek Mtns.

granodiorite, Wilson District

IXL pluton, S. Stillwater Range

Toquima Range, rhyolite dome

Virgin Valley - rhyolite lava

Round Mountain, adularia

Toquima Range, rhyolite dome 

Toquima Range, rhyolite dome 

Toquima Range, rhyolite dome 

granodiorite, N. Toquima Range 

Virgin Valley - rhyolite lava 

Rytuba, rhyolite, McDermitt, Caldera 

Fairview Peak rhyolite dome 

Rytuba, rhyolite, McDermitt Caldera 

Rytuba, rhyodacite, McDermitt 

Fairview Peak rhyolite tuff 

Rytuba,Ta, McDermitt Caldera 42.13

39.14

42.08

41.60

39.21

41.82

41.87

38.96

38.76

38.67

38.92

38.71

41.79

38.71

39.66

38.75

41.31

38.70

40.95

41.37

41.32

39.70

41.32

41.41

40.73

40.86

40.28

41.32

40.60

40.62

41.38

DecLat

1 

118.93

116.83

118.19

118.87

116.23

117.08

116.86

116.25

116.24

116.77

116.36

116.34

116.76

116.61

116.33

116.39

116.27

116.26

116.32

DecLong

1 7.08

1 

116.89

116.96

1 7.04

1 

118.18

118.99

116.87

1 8.00

1 1 8.08

1 

118.15

1 8.09

117.90

206Pb

204Pb

18.963

18.999

19.087

19.091

19.026

19.122

19.180

19.215

19.158

19.165

19.175

19.200

19.179

19.055

19.170

19.118

19.260

19.054

19.459

19.133

18.835

19.067

19.477

18.885

18.872

19.253

19.026

19.572

17.833

19.548

19.744

17.092

207Pb

204Pb

15.607

15.629

15.630

15.649

15.638

15.648

15.629

15.673

15.650

15.649

15.649

15.668

15.649

15.643

15.660

15.690

15.657

15.670

15.667

15.663

15.661

15.676

15.708

15.673

15.663

15.668

15.691

15.698

15.604

15.713

15.729

15.598

208Pb

204Pb

38.706

38.708

38.715

38.722

38.731

38.744

38.756

38.817

38.839

38.844

38.846

38.858

38.859

38.868

38.873

38.925

38.952

38.987

39.013

39.024

39.034

39.080

39.085

39.103

39.103

39.106

39.141

39.170

39.268

39.269

39.415

39.848

19
Table 2. Northern Great Basin Pb Isotopic Data (cont.) 

Sample Number Name

BS95-U.2

94NCA-5

BS95-U.1

94NCA-20-1

94NCA-13

OC-13

JR79-85

94NCA-19

94NCA-14

H95-57

CC-131

CC-123

94NCA-20-2

JR80-16

H93-52

CC-138A Rytuba, rhyolite, McDermitt Caldera 

Fairview Peak rhyolite dike 

Rytuba,Tpa, McDermitt Caldera 

aplite in granodiorite, N. Selenite Range 

Rytuba, rhyolite, McDermitt Caldera 

Rytuba, rhyolite, McDermitt Caldera 

Virgin Valley - rhyolite lava 

granodiorite, Trego Hot Springs 

granodiorite, N. Selenite Range 

Rytuba, Ta2, McDermitt Caldera 

Rytuba, McDermitt Caldera 

granodiorite, Black Rock Range 

granodiorite, N. Selenite Range 

granodiorite, Wilson District 

granodiorite, Division Peak 

granodiorite, Wilson District 38.75

41.10

38.75

40.70

41.27

42.02

42.00

40.75

40.77

41.52

41.73

41.78

40.70

42.15

39.14

41.62

DecLat

1 

119.24

119.12

118.38

118.22

119.15

119.09

119.13

118.15

118.15

119.24

117.97

118.19

118.15

DecLong

1 9.00

1 

119.28

1 9.00

206Pb

204p b

18.728

18.836

18.740

18.852

18.883

18.966

18.991

18.848

18.858

19.026

19.100

19.078

18.956

19.073

19.010

19.072

207Pb

204p b

15.615

15.607

15.612

15.627

15.631

15.612

15.608

15.641

15.640

15.611

15.632

15.642

15.643

15.624

15.623

15.644

208P£

204p b

38.445

38.448

38.448

38.564

38.585

38.590

38.596

38.601

38.604

38.631

38.635

38.640

38.662

38.674

38.681

38.695

20