Sample 257
NavDat sample number 29585 · RHYOLITE
Sample
| Sample ID | 257 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Collected by | R.L. Smith and G.W. Walker |
| Comment | obsidian |
Location
| Latitude | 41.919 |
|---|---|
| Longitude | -120.084 |
| Location | Annie Lake |
| State / province | California |
| Volcanic field | Northeast California |
| Location comment | 1-1/4 mi northeast of Annie Lake, Modoc County |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 33.4 | 1.8 | 65 | Tertiary |
Analyses
Glass
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| CO | 0.2 | PPM | UNKNOWN | |
| CR | 0.7 | PPM | UNKNOWN | |
| CS | 2.2 | PPM | UNKNOWN | |
| HF | 4.5 | PPM | UNKNOWN | |
| RB | 89 | PPM | UNKNOWN | |
| SC | 2.7 | PPM | UNKNOWN | |
| TA | 1.21 | PPM | UNKNOWN | |
| TH | 8.8 | PPM | UNKNOWN | |
| U | 3.7 | PPM | UNKNOWN | |
| LA | 33 | PPM | UNKNOWN | |
| CE | 56 | PPM | UNKNOWN | |
| ND | 24 | PPM | UNKNOWN | |
| SM | 4.5 | PPM | UNKNOWN | |
| EU | 0.55 | PPM | UNKNOWN | |
| GD | 2.8 | PPM | UNKNOWN | |
| TB | 0.63 | PPM | UNKNOWN | |
| TM | 0.42 | PPM | UNKNOWN | |
| YB | 3.2 | PPM | UNKNOWN | |
| LU | 0.5 | PPM | UNKNOWN |