National Geochronological Database sample #1138

Outcrop or artificial surface exposure, Monzonite

Geographic location
-114.991667, 39.255556
114° 59' 30" W, 39° 15' 20" 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 Outcrop or artificial surface exposure
Rock name Monzonite
Description LATE MONZONITE DIKE
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 -114.991667, 39.255556
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K-Ar age determinations

Age estimate 105.12 ± 3Ma
age of intrusion
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 1.28% K
Rock or mineral analyzed hornblende
Analytical details
Lab sample ID L-958
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 1.54 %
Radiogenic 40Ar concentration 2.4
Radiogenic Ar 87 %
Additional reference McDowell (1971)