Outcrop or artificial surface exposure, Quartz monzonite
| Geographic location |
-171.533333, 63.45
171°
32'
"
W,
63°
27'
"
N
AK
St. Lawrence
1:250,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
WESTERN PART OF ST. LAWRENCE ISLAND
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Quartz monzonite |
| Description | QUARTZ MONZONITE PLUTON |
| Laboratories | USGS Menlo Park |
| Compiler name | Degourville, A.E. |
| Date compiled | 1984 04 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | WESTERN PART OF ST. LAWRENCE ISLAND |
| Bibliographic reference | Patton, W.W., Jr., and Csejtey, B., Jr., 1980, Geologic Map Of St. Lawrence Island, Alaska: U.S. Geological Survey Miscellaneous Geologic Investigations Map I-1203. |
| (click for info) | |
| Geologic map unit | -171.533333, 63.45 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 93.5 ± 3Ma age of intrusion
|
|---|---|
| Type of analysis | conventional K-Ar |
| Rock or mineral analyzed | biotite |
| Analytical details | |
| Lab sample ID | 69APA219E |
| Decay constants | 4.962E-04, 0.581E-04, 1.1167E-04 |
| Radiogenic 40Ar concentration | 11.02 |
| Radiogenic Ar | 87 % |