Sample 12
NavDat sample number 4642 · RHYOLITE
Sample
| Sample ID | 12 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Comment | well-banded; phenocrysts of oligoclase and biotite along with a few of quartz; groundmass of microfelsite with microliths swarms of feldspar |
Location
| Latitude | 39.1922 |
|---|---|
| Longitude | -121.769 |
| Location | De Witt's Quarry dome, 3 miles N.W. of Sutter City |
| State / province | California |
| Volcanic field | Sutter Buttes |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 1.75 | 1.5 | 2 |
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| SIO2 | 71.2 | WT% | XRF | |
| TIO2 | 0.12 | WT% | XRF | |
| AL2O3 | 14.96 | WT% | XRF | |
| FEO | 0.42 | WT% | XRF | |
| FE2O3 | 1.1 | WT% | XRF | |
| MNO | 0 | WT% | XRF | |
| CAO | 2.75 | WT% | XRF | |
| MGO | 0.62 | WT% | XRF | |
| NA2O | 3.9 | WT% | XRF | |
| K2O | 3.88 | WT% | XRF | |
| P2O5 | 0.15 | WT% | XRF | |
| H2O_MINUS | 0.2 | WT% | XRF | |
| H2O_PLUS | 0.55 | WT% | XRF | |
| TOTAL | 99.85 | WT% | XRF | |
| NB | 10 | PPM | XRF | |
| ZR | 115 | PPM | XRF | |
| Y | 20 | PPM | XRF | |
| SR | 475 | PPM | XRF | |
| RB | 155 | PPM | XRF | |
| TH | -5 | PPM | XRF | |
| PB | 40 | PPM | XRF | |
| GA | 15 | PPM | XRF | |
| ZN | 35 | PPM | XRF | |
| CU | 15 | PPM | XRF | |
| NI | 10 | PPM | XRF | |
| V | 5 | PPM | XRF | |
| CR | 15 | PPM | XRF | |
| BA | 1905 | PPM | XRF | |
| CE | 35 | PPM | XRF | |
| ND | 15 | PPM | XRF | |
| PR | 5 | PPM | XRF | |
| LA | 10 | PPM | XRF | |
| S | 10 | PPM | XRF |