National Geochronological Database sample #1144

Quarry, Monzonite

Geographic location
-115.005556, 39.261111
115° ' 20" W, 39° 15' 40" N
White Pine county, NV
Riepetown 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
EMMA PIT, ROBINSON MINING DISTRICT
Source of sample Quarry
Rock name Monzonite
Description 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 EMMA 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
(click for info)
Geologic map unit -115.005556, 39.261111
Nearby scientific data Find additional scientific data near this location

K-Ar age determinations

Age estimate 111.12 ± 3Ma
Type of analysis conventional K-Ar
POTASSIUM VALUE IS CONVERTED 8.35% K
Rock or mineral analyzed biotite
Analytical details
Lab sample ID L-1014
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 10.06 %
Radiogenic 40Ar concentration 16.6
Radiogenic Ar 96 %
Additional reference McDowell (1971)
Comments AGE OF HYDROTHERMAL ALTERATION