National Geochronological Database sample #3452

Outcrop or artificial surface exposure, Quartz monzonite

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)
ANTLER PEAK (BATTLE MOUNTAIN) RANGE; SW1/4 SEC. 22, T31N, R43E
Source of sample Outcrop or artificial surface exposure
Rock name Quartz monzonite
Description COPPER CANYON STOCK; PORPHYRITIC BIOTITE-QUARTZ MONZONITE WITH SOME POTASSIC ALTERATION
Laboratories USGS Menlo Park
Compiler name Nichols, S.L.
Date compiled 1978 02
Precision of location Accurate to within 1 minute (~1 mile)
Location comment ANTLER PEAK (BATTLE MOUNTAIN) RANGE; SW1/4 SEC. 22, T31N, R43E
Bibliographic reference Silberman, M.L., and Mckee, E.H., 1971, K-Ar Ages Of Granitic Plutons In North-Central Nevada: Isochron/West, No. 1, p. 15-32.
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Geologic map unit -117.125, 40.541667
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K-Ar age determinations

Age estimate 39.42 ± 0.8Ma
minimum age of intrusion
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
Analytical details
Lab sample ID 21. USGS(M)-M18
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 8.54 %
Radiogenic 40Ar concentration 4.9
Radiogenic Ar 87 %