Outcrop or artificial surface exposure, Quartz monzonite
| Geographic location |
-171.525, 63.452778
171°
31'
30"
W,
63°
27'
10"
N
AK
St. Lawrence C-6
1:63,360 scale map quadrangle
Accurate to within 0.1 minute (~500 feet)
Poovookpuk Mountain, St. Lawrence Island.
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Quartz monzonite |
| Description | Biotite quartz monzonite of the Sevuokuk pluton |
| Laboratories | USGS Menlo Park |
| Compiler name | Zartman, R. |
| Date compiled | 1994 11 |
| Precision of location | Accurate to within 0.1 minute (~500 feet) |
| Location comment | Poovookpuk Mountain, St. Lawrence Island. |
| Bibliographic reference | Csejtey, B., Jr., Patton, W.W., Jr., and Miller, T.P., 1971, Cretaceous plutonic rocks of St. Lawrence Island, Alaska A preliminary report: U. S. Geological Survey Professional Paper 750-D, p. D68-D76. |
| (click for info) | |
| Geologic map unit | -171.525, 63.452778 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 91.3 ± 3Ma age of intrusion
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | 69Apa-219e (2) |
| Decay constants | 4.72E-04, 0.585E-04, 1.19E-04 |
| K2O concentration | 7.98 % |
| Radiogenic 40Ar concentration | 11.02 |
| Radiogenic Ar | 87 % |