National Geochronological Database sample #4157

Quarry, Intrusive

Geographic location
-114.958333, 39.261111
114° 57' 30" W, 39° 15' 40" N
White Pine county, NV
Ruth 1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
ELY MINING DISTRICT, KIMBERLY PIT
Source of sample Quarry
Rock name Intrusive
Description ALTERED INTRUSIVE ROCK
Laboratories University of Minnesota
Compiler name Nichols, S.L.
Date compiled 1978 06
Precision of location Accurate to within 1 minute (~1 mile)
Location comment ELY MINING DISTRICT, KIMBERLY PIT
Bibliographic reference Schwartz, G.M., 1959, Hydrothermal alteration: Economic Geology, v. 54, p. 161-183
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Geologic map unit -114.958333, 39.261111
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K-Ar age determinations

Age estimate 125Ma
Type of analysis conventional K-Ar
Rock or mineral analyzed biotite
SECONDARY BROWN MICA
Analytical details
Lab sample ID (NOT GIVEN)
Decay constants 4.72E-04, 0.583E-04*
K2O concentration 8.36 %
Radiogenic 40Ar concentration 15.5
Comments AGE OF HYDROTHERMAL ALTERATION, AGE OF MINERALIZATION