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Sample 47-B-1
NavDat sample number 8386 · RHYOLITE
Sample
| Sample ID | 47-B-1 |
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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 | Cream to buff colored lava, often pumiceous; plagioclase An40-60, clinopyroxene, orthopyroxene, hornblende, titanomagnetite phenocrysts set in a trachytic cryptocrystalline groundmass peppered with opaques and plagioclase microlites. |
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Location
| Latitude | 41.6432 |
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| Longitude | -121.713 |
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| State / province | California |
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| Volcanic field | Medicine Lake Highland |
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| Location comment | summit dome that forms hill 5598 |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 1.18 |
|
1.12 |
1.24 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 70.81 | | WT% | XRF |
| AL2O3 | 14.65 | | WT% | XRF |
| FEO | 1.6 | | WT% | XRF |
| FE2O3 | 1.18 | | WT% | XRF |
| TIO2 | 0.39 | | WT% | XRF |
| MNO | 0.08 | | WT% | XRF |
| MGO | 0.42 | | WT% | XRF |
| CAO | 1.89 | | WT% | XRF |
| NA2O | 4.66 | | WT% | XRF |
| K2O | 2.91 | | WT% | XRF |
| P2O5 | 0.08 | | WT% | XRF |
