Outcrop or artificial surface exposure, Gneiss
| Geographic location |
-165.3, 64.966667
165°
18'
"
W,
64°
58'
"
N
AK
Nome D-1
1:63,360 scale map quadrangle
Accurate to within 5 minute (~5 miles)
KIGLUAIK MOUNTAINS, SEWARD PENINSULA
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Gneiss |
| Description | PARAGNEISS, KIGLUAIK GROUP |
| Laboratories | USGS Denver |
| Compiler name | Degourville, A.E. |
| Date compiled | 1984 04 |
| Precision of location | Accurate to within 5 minute (~5 miles) |
| Location comment | KIGLUAIK MOUNTAINS, SEWARD PENINSULA |
| Bibliographic reference | Bunker, C.M., Hedge, C.E., and Sainsbury, C.L., 1979, Radioelement Concentrations and Preliminary Radiometric Ages Of Rocks Of The Kigluaik Mountains, Seward Peninsula, Alaska: U.S. Geological Survey Professional Paper 1129-C, C12p. |
| (click for info) | |
| Geologic map unit | -165.3, 64.966667 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 750Ma |
|---|---|
| Type of analysis | Conventional Rb-Sr (assumed initial 87Sr/86Sr) |
| Rock or mineral analyzed | whole rock |
| Analytical details | |
| Lab sample ID | 70ACH-15 |
| Decay constants | 1.42E-05 |
| Rubidium concentration | 87.2 ppm |
| Strontium concentration | 130 ppm |
| Initial 87Sr/86Sr | 0.7043 |
| Ratio 87Rb/86Sr | 1.949 |
| Ratio 87Sr/86Sr | 0.7247 |
| Normal? | T |
| Age estimate | 735Ma age of metamorphic crystallization
|
| Type of analysis | 87Sr/86Sr-87Rb/86Sr isochron (whole rock) 5-POINT WHOLE-ROCK ISOCHRON
|
| Rock or mineral analyzed | whole rock |
| Analytical details | |
| Lab sample ID | 70ACH-15 |
| Sample suite # | 590 |
| Decay constants | 1.42E-05 |
| Rubidium concentration | 87.2 ppm |
| Strontium concentration | 130 ppm |
| Initial 87Sr/86Sr | 0.7043 |
| Ratio 87Rb/86Sr | 1.949 |
| Ratio 87Sr/86Sr | 0.7247 |
| Normal? | T |