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Sample ML-74-17
NavDat sample number 8384 · RHYOLITE
Sample
| Sample ID | ML-74-17 |
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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 pumiceous lava with unfilled and unlined vesicles; plagioclase An30-50 often oval-shaped from resorption; orthopyroxene, clinopyroxene, and titanomagnetite phenocrysts set in a pilotaxitic groundmass dominated by fresh clear glass. |
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Location
| Latitude | 41.6104 |
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| Longitude | -121.553 |
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| State / province | California |
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| Volcanic field | Medicine Lake Highland |
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| Location comment | summit dome on Mount Hoffman |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 0.04 |
|
0 |
0.08 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 70.44 | | WT% | XRF |
| AL2O3 | 14.18 | | WT% | XRF |
| FEO | 1.68 | | WT% | XRF |
| FE2O3 | 0.88 | | WT% | XRF |
| TIO2 | 0.4 | | WT% | XRF |
| MNO | 0.06 | | WT% | XRF |
| MGO | 0.58 | | WT% | XRF |
| CAO | 1.65 | | WT% | XRF |
| NA2O | 4.68 | | WT% | XRF |
| K2O | 3.73 | | WT% | XRF |
| P2O5 | 0.07 | | WT% | XRF |
