Outcrop or artificial surface exposure, Andesite
| Geographic location |
-117.250278, 41.201111
117°
15'
1"
W,
41°
12'
4"
N
Humboldt county,
NV
Osgood Mountains
1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
RILEY MINE
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Andesite |
| Description | FRESH, UNDEFORMED ANDESITE PORPHYRY DIKE |
| Laboratories | USGS Menlo Park |
| Compiler name | Marvin, R.F. |
| Date compiled | 1981 01 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | RILEY MINE |
| Bibliographic reference | Berger, B.R., and Taylor, B.E., 1980, Precenozoic Normal Faulting In The Osgood Mountains, Humboldt County, Nevada: Geology, v. 8, p. 594-598. |
| (click for info) | |
| Geologic map unit | -117.250278, 41.201111 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 89.7 ± 1.8Ma age of intrusion
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | R-1 |
| Decay constants | 4.962E-04, 0.581E-04, 1.1167E-04 |
| K2O concentration | 8.79 % |
| Radiogenic 40Ar concentration | 11.93 |
| Radiogenic Ar | 95 % |
| Age estimate | 89.9 ± 1.8Ma age of intrusion
|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | hornblende |
| Analytical details | |
| Lab sample ID | R-1 |
| Decay constants | 4.962E-04, 0.581E-04, 1.1167E-04 |
| K2O concentration | 1.31 % |
| Radiogenic 40Ar concentration | 1.786 |
| Radiogenic Ar | 85 % |