National Geochronological Database sample #3699

Outcrop or artificial surface exposure, Andesite

Geographic location
-115.473333, 35.811667
115° 28' 24" W, 35° 48' 42" N
Clark county, NV
Goodsprings 1:62,500 scale map quadrangle
Accurate to within 0.1 minute (~500 feet)
Source of sample Outcrop or artificial surface exposure
Rock name Andesite
Laboratories Ohio State University
Compiler name Nichols, S.L.
Date compiled 1978 03
Precision of location Accurate to within 0.1 minute (~500 feet)
Location comment SPRING MOUNTAINS
Bibliographic reference Marvin, R.F., Mehnert, H.H., and Mckee, E.H., 1973, A Summary Of Radiometric Ages Of Tertiary Volcanic Rocks In Nevada and Eastern California. Part III: Southeastern Nevada: Isochron/West, No. 6, p. 1-30.
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Geologic map unit -115.473333, 35.811667
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K-Ar age determinations

Age estimate 12.3 ± 0.4Ma
age of volcanism
Type of analysis conventional K-Ar
Rock or mineral analyzed whole rock
Analytical details
Lab sample ID 124
Decay constants 4.72E-04, 0.585E-04, 1.19E-04*
K2O concentration 4.78 %
Radiogenic 40Ar concentration 0.8491