Outcrop or artificial surface exposure, Gneiss
| Geographic location |
-81.955556, 36.147222
81°
57'
20"
W,
36°
8'
50"
N
Avery county,
NC
Elk Park
1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
NORTH CAROLINA COORDINATES: 885800N, 1127500E; NORTH CAROLINA HIGHWAY 194
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Gneiss |
| Description | USUALLY HIGHLY-DEFORMED, COARSE-GRAINED GNEISS (FELDSPAR, QUARTZ, BIOTITE, SPHENE) WITH LAYERS OF FINER-GRAINED, MORE MAFIC MATERIAL; CRANBERRY GNEISS |
| Laboratories | University of North Carolina |
| Compiler name | Marvin, R.F. |
| Date compiled | 1984 08 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | NORTH CAROLINA COORDINATES: 885800N, 1127500E; NORTH CAROLINA HIGHWAY 194 |
| Bibliographic reference | Fullager, P.D., and Bartholomew, M.J., 1983, Rubidium-Strontium Ages Of The Watauga River, Cranberry, and Crossing Knob Gneisses, Northwestern North Carolina ""In"" Lewis, S.E., ed., Geological Investigations In The Blue Ridge Of Northwestern North Carolina: 1983 Guidebook For The Carolina Geological Society, North Carolina Division Of Land Resources, Article 2, 29p In Lewis, S.E., Ed., Geological Investigations In The Blue Ridge Of Northwestern North Carolina: 1983 Guidebook For The Carolina Geological Society, North Carolina Division Of Land Resources, Article 2, 29p. |
| (click for info) | |
| Geologic map unit | -81.955556, 36.147222 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimate | 1018 ± 19Ma |
|---|---|
| Type of analysis | 87Sr/86Sr-87Rb/86Sr isochron (whole rock) 22-POINT WHOLE-ROCK ISOCHRON
|
| Rock or mineral analyzed | whole rock |
| Analytical details | |
| Lab sample ID | 1946 |
| Sample suite # | 615 |
| Decay constants | 1.42E-05 |
| Rubidium concentration | 114.6 ppm |
| Strontium concentration | 173 ppm |
| Initial 87Sr/86Sr | 0.708 |
| Ratio 87Rb/86Sr | 1.922 |
| Ratio 87Sr/86Sr | 0.7364 |
| Normal? | T |