National Geochronological Database sample #1137

Core or cutting, Rhyolite

Geographic location
-114.995833, 39.261111
114° 59' 45" W, 39° 15' 40" N
White Pine county, NV
Ruth 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
LIBERTY PIT, ROBINSON MINING DISTRICT
Source of sample Core or cutting
Rock name Rhyolite
Laboratories Lamont (Columbia University)
Compiler name Marvin, R.F.
Date compiled 1976 04
Precision of location Accurate to within 1 minute (~1 mile)
Location comment LIBERTY PIT, ROBINSON MINING DISTRICT
Bibliographic reference Mcdowell, F.W., and Kulp, J.L., 1967, Age Of Intrusion and Ore Deposition In The Robinson Mining District Of Nevada: Economic Geology, v. 62, p. 905-909
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Geologic map unit -114.995833, 39.261111
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K-Ar age determinations

Age estimate 37.81 ± 1Ma
age of intrusion
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 7.38% K
Rock or mineral analyzed biotite
Analytical details
Lab sample ID L-969
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 8.89 %
Radiogenic 40Ar concentration 4.89
Radiogenic Ar 86 %
Additional reference McDowell (1971)