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Sample SM-75-104
NavDat sample number 8385 · RHYOLITE
Sample
| Sample ID | SM-75-104 |
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| 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 | Gray to buff colored, densely welded, tuffaceous rock; plagioclase An30-60 with strongly developed oscillatory zoning, crystals often broken; hornblende, orthopyroxene, biotite, and titanomagnetite phenocrysts set in a densely welded flow aligned fresh clear glass dominated groundmass. |
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Location
| Latitude | 41.7851 |
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| Longitude | -121.614 |
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| State / province | California |
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| Volcanic field | Medicine Lake Highland |
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| Location comment | outcrop 0.1 mi S of Lairds Camp-Mount Dome road in the hanging wall of a N10W striking normal fault |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 1.25 |
|
1.01 |
1.49 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 70.78 | | WT% | XRF |
| AL2O3 | 14.3 | | WT% | XRF |
| FEO | 1.06 | | WT% | XRF |
| FE2O3 | 1.21 | | WT% | XRF |
| TIO2 | 0.27 | | WT% | XRF |
| MNO | 0.07 | | WT% | XRF |
| MGO | 0.65 | | WT% | XRF |
| CAO | 1.71 | | WT% | XRF |
| NA2O | 4.03 | | WT% | XRF |
| K2O | 3.41 | | WT% | XRF |
| P2O5 | 0.07 | | WT% | XRF |
