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Sample COBA 3-92
NavDat sample number 42417 · GRANODIORITE
Sample
| Sample ID | COBA 3-92 |
|---|
| Rock name | GRANODIORITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
|---|
Location
| Latitude | 38.0112 |
|---|
| Longitude | -123.44 |
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| State / province | California |
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| Location comment | sheared biotite granodiorite at 140 feet depth (COBA2-92) and at 120 feet depth (COBA3-92) on northern Cordell bank |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 100 |
|
90 |
110 |
|
|
Analyses
WHOLE ROCK
| Item | Value | Std. dev. | Unit | Method |
|---|
| RB | 108 | | PPM | EDXRF |
| SR | 268 | | PPM | EDXRF |
| RB_SR | 0.402 | | | MS |
| RB87_SR86 | 1.163 | | | MS |
| SR87_SR86 | 0.70746 | | | MS |
| SR87_SR86_INITIAL | 0.7058 | | | MS |
References
- Kistler, R W; Champion, D E (2001) Rb-Sr whole-rock and mineral ages, K-Ar, (super 40) Ar/ (super 39) Ar, and U-Pb mineral ages, and strontium, lead, neodymium, and oxygen isotopic compositions for granitic rocks from the Salinian Composite Terrane, California. Open-File Report - U. S. Geological Survey. 2001.
