Outcrop or artificial surface exposure, Gabbro
| Geographic location |
-119.284722, 36.870833
119°
17'
5"
W,
36°
52'
15"
N
Fresno county,
CA
Pine Flat Dam
1:24,000 scale map quadrangle
Accurate to within 1 minute (~1 mile)
NORTH OF PINE FLAT RESERVOIR, SW SIERRA NEVADA FOOTHILLS
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Gabbro |
| Description | HORNBLENDE GABBRO |
| Laboratories | University of California, Santa Barbara |
| Compiler name | Marvin, R.F. |
| Date compiled | 1981 10 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | NORTH OF PINE FLAT RESERVOIR, SW SIERRA NEVADA FOOTHILLS |
| Bibliographic reference | Saleeby, J., and Sharp, W., 1980, Chronology Of The Structural and Petrologic Development Of The Southwest Sierra Nevada Foothills, California: Geological Society of America Bulletin, Part II, v. 91, p. 1416-1535. |
| (click for info) | |
| Geologic map unit | -119.284722, 36.870833 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimates |
97.9Ma by 206Pb/238U
97.8Ma by 207Pb/235U
96Ma by 207Pb/206Pb
|
|---|---|
| Rock or mineral analyzed | zircon CLEAR, HOMOGENEOUS, NON-MAGNETIC, 80-200 MESH ZIRCONS
|
| Analytical details | |
| Lab sample ID | KB10 |
| Decay constants | 1.55125E-04, 9.8485E-04, 4.9475E-05 |
| Uranium concentration | 459 ppm |
| Lead concentration | 8 ppm |
| 204Pb concentration | 0.152 |
| 206Pb concentration | 75.67 |
| 207Pb concentration | 5.853 |
| 208Pb concentration | 18.32 |
| Comments | U-PB ISOTOPIC SYSTEMS HAVE BEEN BADLY DISTURBED. THE KAWEAH OPHIOLITIC BELT PROBABLY FORMED 280 M.Y. AGO. |