National Geochronological Database sample #1143

Quarry, Monzonite

Geographic location
-114.991667, 39.261111
114° 59' 30" 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 Quarry
Rock name Monzonite
Description INITIAL STAGE, BIOTITE-ARGILLIC ALTERATION OF MONZONITE
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, 39.261111
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K-Ar age determinations

Age estimate 113.42 ± 3Ma
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 7.39% K
Rock or mineral analyzed biotite
Analytical details
Lab sample ID L-1013
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 8.9 %
Radiogenic 40Ar concentration 15
Radiogenic Ar 90 %
Additional reference McDowell (1971)
Comments AGE OF HYDROTHERMAL ALTERATION