Outcrop or artificial surface exposure, Granodiorite
| Geographic location |
-116.694722, 40.308056
116°
41'
41"
W,
40°
18'
29"
N
Lander county,
NV
Crescent Valley
1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
SHOSHONE RANGE
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Granodiorite |
| Description | PORPHYRITIC GRANODIORITE |
| 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 | SHOSHONE RANGE |
| Bibliographic reference | McKee, E.H., and Silberman, M.L., 1970, Geochronology Of Tertiary Igneous Rocks In Central Nevada: Geological Society of America Bulletin, v. 81, p. 2317-2328. |
| (click for info) | |
| Geologic map unit | -116.694722, 40.308056 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 38.11Ma age of intrusion
|
|---|---|
| Type of analysis | conventional K-Ar REPLICATE POTASSIUM ANALYSES
|
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | 3 |
| Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
| K2O concentration | 7.99 % |
| Radiogenic 40Ar concentration | 4.43 |
| Radiogenic Ar | 81 % |
| Age estimate | 38.45Ma age of intrusion
|
| Type of analysis | conventional K-Ar REPEAT AR ANALYSIS
|
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | 3 |
| Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
| K2O concentration | 7.99 % |
| Radiogenic 40Ar concentration | 4.47 |
| Radiogenic Ar | 83 % |
| Age estimate | 38.92Ma age of intrusion
|
| Type of analysis | conventional K-Ar POTASSIUM VALUE IS AVERAGE OF 8 ANALYSES
|
| Rock or mineral analyzed | hornblende |
| Analytical details | |
| Lab sample ID | 3 |
| Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
| K2O concentration | 1.077 % |
| Radiogenic 40Ar concentration | 0.61 |
| Radiogenic Ar | 71 % |