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
|
|---|---|
| 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
|
|---|---|
| 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 % |