Sample B-87
NavDat sample number 3814 · RHYOLITE
Sample
| Sample ID | B-87 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Comment | Bedded white airfall pumice, 2.5 m. thick, overlying lacustrine siltstone and overlain by concetration of coarse lapilli at base of non-welded ash-flw. Sample mostly 1-10 mm. pumice from center of airfall unit. |
Location
| Latitude | 37.4699 |
|---|---|
| Longitude | -118.37 |
| State / province | California |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 0.76 | 0.759 | 0.761 |
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| LA | 22.3 | PPM | INAA | |
| CE | 50 | PPM | INAA | |
| ND | 20.4 | PPM | INAA | |
| SM | 3.73 | PPM | INAA | |
| EU | 0.056 | PPM | INAA | |
| TB | 0.55 | PPM | INAA | |
| DY | 3.67 | PPM | INAA | |
| YB | 2.58 | PPM | INAA | |
| LU | 0.42 | PPM | INAA | |
| RB | 185 | PPM | INAA | |
| CS | 5.3 | PPM | INAA | |
| BA | 44 | PPM | INAA | |
| TH | 20.64 | PPM | INAA | |
| U | 6.55 | PPM | INAA | |
| SC | 3.06 | PPM | INAA | |
| HF | 3.68 | PPM | INAA | |
| TA | 2.03 | PPM | INAA | |
| CR | 2.1 | PPM | INAA | |
| CO | 0.42 | PPM | INAA | |
| ZN | 38 | PPM | INAA | |
| MN | 285 | PPM | INAA | |
| W | 2.7 | PPM | INAA | |
| SB | 1.2 | PPM | INAA |