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Sample MB142
NavDat sample number 6830 · TRACHYTE
Sample
| Sample ID | MB142 |
|---|
| Rock name | TRACHYTE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | holocrystalline; aphanitic groundmass of sanidine, analcime, aegirine, calcite, hematite, zeolite; phenocrysts of sanidine, aegirine-augite, anorthoclase, sphene, nepheline, nosean |
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Location
| Latitude | 44.6107 |
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| Longitude | -104.781 |
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| Location | Missouri Buttes |
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| State / province | Wyoming |
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| Volcanic field | Missouri Buttes trachyte |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 50.9 |
|
49.2 |
52.6 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 61.06 | | WT% | XRF |
| AL2O3 | 19.81 | | WT% | XRF |
| FE2O3 | 1.86 | | WT% | XRF |
| FEO | 1.38 | | WT% | XRF |
| MGO | 0.72 | | WT% | XRF |
| CAO | 2 | | WT% | XRF |
| NA2O | 7.12 | | WT% | EPMA |
| K2O | 5.2 | | WT% | XRF |
| TIO2 | 0.36 | | WT% | XRF |
| P2O5 | 0.28 | | WT% | XRF |
| MNO | 0.12 | | WT% | XRF |
