National Geochronological Database sample #3906

Outcrop or artificial surface exposure, Basalt

Geographic location
-117.156944, 37.695833
117° 9' 25" W, 37° 41' 45" N
Nye county, NV
Goldfield 1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
Source of sample Outcrop or artificial surface exposure
Rock name Basalt
Description NONVESICULAR APHANITIC BASALT, 3 METERS ABOVE BASE OF BASALT OF BLACKCAP MOUNTAIN
Laboratories USGS Menlo Park
Compiler name Nichols, S.L.
Date compiled 1978 04
Precision of location Accurate to within 1 minute (~1 mile)
Bibliographic reference Ashley, R.P., and Silberman, M.L., 1976, Direct Dating Of Mineralization At Goldfield, Nevada, By Potassium-Argon and Fission-Track Methods: Economic Geology, v. 71, p. 904-924.
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Geologic map unit -117.156944, 37.695833
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K-Ar age determinations

Age estimate 10.68 ± 1.3Ma
age of volcanism
Type of analysis conventional K-Ar
1.77%, 1.70%, 1.75%, 1.70% K2O; 0.3002 X E-10, 0.2334 X E-10 MOL/GM ARGON
Rock or mineral analyzed whole rock
Analytical details
Lab sample ID 166-76
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 1.73 %
Radiogenic 40Ar concentration 0.2668
Radiogenic Ar 32 %