Sample B-20
NavDat sample number 3811 · RHYOLITE
Sample
| Sample ID | B-20 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Comment | Pumice from basal 3 m of non-welded ash-flow; overlying bedded airfall unit. |
Location
| Latitude | 37.4116 |
|---|---|
| Longitude | -118.481 |
| 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 | 29 | PPM | INAA | |
| CE | 58.6 | PPM | INAA | |
| ND | 23.2 | PPM | INAA | |
| SM | 3.17 | PPM | INAA | |
| EU | 0.095 | PPM | INAA | |
| TB | 0.4 | PPM | INAA | |
| DY | 2.68 | PPM | INAA | |
| YB | 1.82 | PPM | INAA | |
| LU | 0.29 | PPM | INAA | |
| RB | 144 | PPM | INAA | |
| CS | 3.9 | PPM | INAA | |
| BA | 61 | PPM | INAA | |
| TH | 15.33 | PPM | INAA | |
| U | 4.62 | PPM | INAA | |
| SC | 2.32 | PPM | INAA | |
| HF | 3.15 | PPM | INAA | |
| TA | 1.41 | PPM | INAA | |
| CR | 2 | PPM | INAA | |
| CO | 0.33 | PPM | INAA | |
| ZN | 34 | PPM | INAA | |
| MN | 206 | PPM | INAA | |
| W | 2.4 | PPM | INAA | |
| SB | 1 | PPM | INAA |