National Geochronological Database sample #3645

Quarry, Conglomerate

Geographic location
-117.125, 40.541667
117° 7' 30" W, 40° 32' 30" N
Lander county, NV
Antler Peak 1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
FROM 6500 BENCH OF COPPER CANYON PORPHYRY COPPER DEPOSIT; SW1/4 SEC. 22, T31N, R43E
Source of sample Quarry
Rock name Conglomerate
Description MINERALIZED CONGLOMERATE, BATTLE FORMATION, COPPER CANYON PORPHYRY COPPER DEPOSIT
Laboratories USGS Menlo Park
Compiler name Nichols, S.L.
Date compiled 1978 04
Precision of location Accurate to within 1 minute (~1 mile)
Location comment FROM 6500 BENCH OF COPPER CANYON PORPHYRY COPPER DEPOSIT; SW1/4 SEC. 22, T31N, R43E
Bibliographic reference Theodore, T.G., Silberman, M.L., and Blake, D.W., 1973, Geochemistry and Potassium-Argon Ages Of Plutonic Rocks In The Battle Mountain Mining District, Lander County, Nevada: U.S. Geological Survey Professional Paper 798A, A24pp.
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Geologic map unit -117.125, 40.541667
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K-Ar age determinations

Age estimate 38.03 ± 0.7Ma
Type of analysis conventional K-Ar
Rock or mineral analyzed whole rock
-100+150 MESH MATERIAL CONSISTING OF BIOTITE, K-FELDSPAR, WHITE MICA, QUARTZ, AND PLAGIOCLASE SEPARATED FROM PYRITE AND CHALCOPYRITE
Analytical details
Lab sample ID 14. (MB-52)
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 2.55 %
Radiogenic 40Ar concentration 1.411
Radiogenic Ar 52 %
Comments ALTERATION AGE; AGE OF MINERALIZATION