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Sample SM-75-51
NavDat sample number 8392 · RHYOLITE
Sample
| Sample ID | SM-75-51 |
|---|
| Rock name | RHYOLITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | Obsidian sample, no phenocrysts; fluidal banding is a conspicuous feature and is delineated by bands of glass and flow aligned crystallite-rich layers. |
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Location
| Latitude | 41.6975 |
|---|
| Longitude | -121.645 |
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| State / province | California |
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| Volcanic field | Medicine Lake Highland |
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| Location comment | 2.4 mi NW of the summit of Cinder Butte, 100 yards west of recent andesite flow front |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 0.61 |
|
0.58 |
0.64 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 74.96 | | WT% | XRF |
| AL2O3 | 12.93 | | WT% | XRF |
| FEO | 0.82 | | WT% | XRF |
| FE2O3 | 0.42 | | WT% | XRF |
| TIO2 | 0.21 | | WT% | XRF |
| MNO | 0.04 | | WT% | XRF |
| MGO | 0.08 | | WT% | XRF |
| CAO | 0.86 | | WT% | XRF |
| NA2O | 4.06 | | WT% | XRF |
| K2O | 4.63 | | WT% | XRF |
| P2O5 | 0.04 | | WT% | XRF |
