Outcrop or artificial surface exposure, Granodiorite
| Geographic location |
-153.615556, 61.381111
153°
36'
56"
W,
61°
22'
52"
N
AK
Lime Hills B-2
1:63,360 scale map quadrangle
Accurate to within 1 second (~100 feet)
ALASKA PENINSULA
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Granodiorite |
| Laboratories | USGS Menlo Park |
| Compiler name | Madden, C.T. |
| Date compiled | 1974 11 |
| Precision of location | Accurate to within 1 second (~100 feet) |
| Location comment | ALASKA PENINSULA |
| Bibliographic reference | Reed, B.L., and Lanphere, M.A., 1969, Alaska-Aleutian Range Batholith: Geological Society of America Bulletin, v. 80, p. 2583-2610. |
| (click for info) | |
| Geologic map unit | -153.615556, 61.381111 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 41.44 ± 1.1Ma initial age disturbed by later metamorphism
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | 82 |
| Decay constants | 4.72E-04, 0.585E-04, 1.19E-04* |
| K2O concentration | 8.98 % |
| Radiogenic 40Ar concentration | 5.42 |
| Radiogenic Ar | 80 % |
| Additional reference | Reed and Lanphere (1972); Reed and Lanphere (1969) |