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Sample COBA4-90
NavDat sample number 42422 · TONALITE
Sample
| Sample ID | COBA4-90 |
|---|
| Rock name | TONALITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
Location
| Latitude | 38.0682 |
|---|
| Longitude | -123.445 |
|---|
| State / province | California |
|---|
| Location comment | tonalite, granodiorite, and aplite-pegmatite cobbles dredged from Cordell Bank |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 90 |
|
81 |
99 |
|
|
Analyses
WHOLE ROCK
| Item | Value | Std. dev. | Unit | Method |
|---|
| RB | 67 | | PPM | EDXRF |
| SR | 369 | | PPM | EDXRF |
| RB_SR | 0.182 | | | MS |
| RB87_SR86 | 0.526 | | | MS |
| SR87_SR86 | 0.70783 | | | MS |
| SR87_SR86_INITIAL | 0.70716 | | | 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.
