Outcrop or artificial surface exposure, Quartz monzonite
| Geographic location |
-117.588333, 36.251667
117°
35'
18"
W,
36°
15'
6"
N
Inyo county,
CA
Darwin
1:62,500 scale map quadrangle
Accurate to within 1 minute (~1 mile)
ROAD 3.2 KM SOUTH OF DARWIN
|
|---|---|
| Source of sample | Outcrop or artificial surface exposure |
| Rock name | Quartz monzonite |
| Description | QUARTZ MONZONITE OF COSO PLUTON |
| Laboratories | University of California, Santa Barbara |
| Compiler name | Singh, P. |
| Date compiled | 1983 06 |
| Precision of location | Accurate to within 1 minute (~1 mile) |
| Location comment | ROAD 3.2 KM SOUTH OF DARWIN |
| Bibliographic reference | Chen, J.H., and Moore, J.G., 1982, Uranium-lead isotopic ages from the Sierra Nevada Batholith, California: Journal of Geophysical Research, v. 87, No. B6, p. 4761-4784. |
| (click for info) | |
| Geologic map unit | -117.588333, 36.251667 |
| Nearby scientific data | Find additional scientific data near this location |
| Age estimates |
155.9Ma by 206Pb/238U
156.1Ma by 207Pb/235U
161Ma by 207Pb/206Pb
|
|---|---|
| Rock or mineral analyzed | zircon -200+325 MESH FRACTION
|
| Analytical details | |
| Lab sample ID | 78 COSO-1(M)S |
| Decay constants | 1.55125E-04, 9.8485E-04, 4.9475E-05 |
| 204Pb concentration | 0.159 |
| 206Pb concentration | 71.23 |
| 207Pb concentration | 5.808 |
| 208Pb concentration | 22.8 |
| Comments on analysis | 238U=628 PPM, 206PB=13.27 PPM |
| Comments | PLUTON IS AROUND 156 M.Y. OLD |
| Age estimates |
157.1Ma by 206Pb/238U
158.5Ma by 207Pb/235U
180Ma by 207Pb/206Pb
|
| Rock or mineral analyzed | zircon +200 MESH FRACTION
|
| Analytical details | |
| Lab sample ID | 78 COSO-1(C)S |
| Decay constants | 1.55125E-04, 9.8485E-04, 4.9475E-05 |
| 204Pb concentration | 0.192 |
| 206Pb concentration | 70.01 |
| 207Pb concentration | 6.294 |
| 208Pb concentration | 23.51 |
| Comments on analysis | 238U=642 PPM, 206PB=13.70 PPM |
| Comments | PLUTON IS AROUND 156 M.Y. OLD |