Outcrop or artificial surface exposure, Rhyolite porphyry
Geographic location |
-116.683333, 40.3
116°
41'
"
W,
40°
18'
"
N
Lander county,
NV
Crescent Valley
1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
NORTHERN SHOSHONE RANGE; NW1/4 SEC. 16, T28N, R47E; AT ALTENBERG HILL
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Source of sample | Outcrop or artificial surface exposure |
Rock name | Rhyolite porphyry |
Description | RHYOLITE PORPHYRY DIKE |
Laboratories | USGS Menlo Park |
Compiler name | Nichols, S.L. |
Date compiled | 1978 02 |
Precision of location | Accurate to within 1 minute (~1 mile) |
Location comment | NORTHERN SHOSHONE RANGE; NW1/4 SEC. 16, T28N, R47E; AT ALTENBERG HILL |
Bibliographic reference | Silberman, M.L., and Mckee, E.H., 1971, K-Ar Ages Of Granitic Plutons In North-Central Nevada: Isochron/West, No. 1, p. 15-32. |
(click for info) | |
Geologic map unit | -116.683333, 40.3 |
Nearby scientific data | Find additional scientific data near this location |
Age estimate | 35.68 ± 0.7Ma age of intrusion
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Type of analysis | conventional K-Ar REPLICATE ARGON ANALYSES
|
Rock or mineral analyzed | biotite |
Analytical details | |
Lab sample ID | 8. USGS(M)-M125 |
Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
K2O concentration | 8.24 % |
Radiogenic 40Ar concentration | 4.275 |
Radiogenic Ar | 8084 % |
Age estimate | 35.59 ± 0.7Ma age of intrusion
|
Type of analysis | conventional K-Ar |
Rock or mineral analyzed | sanidine |
Analytical details | |
Lab sample ID | 8. USGS(M)-M125 |
Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
K2O concentration | 11.6 % |
Radiogenic 40Ar concentration | 6.003 |
Radiogenic Ar | 98 % |