National Geochronological Database sample #1142

Core or cutting, Monzonite

Geographic location
-114.995833, 39.256944
114° 59' 45" W, 39° 15' 25" N
White Pine county, NV
Ruth 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
ROBINSON MINING DISTRICT
Source of sample Core or cutting
Rock name Monzonite
Description LIBERTY PIT MONZONITE STOCK
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 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, 39.256944
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K-Ar age determinations

Age estimate 116.84 ± 3Ma
age of intrusion
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 5.35% K
Rock or mineral analyzed biotite
Analytical details
Lab sample ID L-962
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 6.445 %
Radiogenic 40Ar concentration 11.2
Radiogenic Ar 91 %
Additional reference McDowell (1971)
Age estimate 109.4 ± 3Ma
age of intrusion
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 0.836% K
Rock or mineral analyzed hornblende
Analytical details
Lab sample ID L-962
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 1.01 %
Radiogenic 40Ar concentration 1.64
Radiogenic Ar 90 %
Additional reference McDowell (1971)