← Search
Sample 11
NavDat sample number 4641 · RHYOLITE
Sample
| Sample ID | 11 |
|---|
| Rock name | RHYOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | phenocrysts of oligoclase, quartz, and biotite; microfelsitic groudmass contains swarms of isolated and coalescing spheroids |
|---|
Location
| Latitude | 39.225 |
|---|
| Longitude | -121.849 |
|---|
| Location | about 0.5 miles SW of Old Keenan Ranch house |
|---|
| 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 | 68.84 | | WT% | XRF |
| TIO2 | 0.14 | | WT% | XRF |
| AL2O3 | 16.03 | | WT% | XRF |
| FEO | 2.74 | | WT% | XRF |
| FE2O3 | 0.12 | | WT% | XRF |
| MNO | 0.07 | | WT% | XRF |
| CAO | 2.67 | | WT% | XRF |
| MGO | 0.54 | | WT% | XRF |
| NA2O | 4.21 | | WT% | XRF |
| K2O | 2.42 | | WT% | XRF |
| P2O5 | 0.08 | | WT% | XRF |
| H2O_MINUS | 0.18 | | WT% | XRF |
| H2O_PLUS | 1.82 | | WT% | XRF |
| CO2 | 0.37 | | WT% | XRF |
| TOTAL | 100.23 | | WT% | XRF |
