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Sample MB159*
NavDat sample number 6828 · TRACHYTE
Sample
| Sample ID | MB159* |
|---|
| Rock name | TRACHYTE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Comment | holocrystalline; aphanitic groundmass of sanidine, analcime, aegirine, zeolite, clay; phenocrysts of sanidine, aegirine-augite, anorthoclase, sphene, nepheline, nosean |
|---|
Location
| Latitude | 44.6146 |
|---|
| Longitude | -104.782 |
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| Location | Missouri Buttes |
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| State / province | Wyoming |
|---|
| Volcanic field | Missouri Buttes trachyte |
|---|
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 | 61.73 | | WT% | XRF |
| AL2O3 | 18 | | WT% | XRF |
| FE2O3 | 1.8 | | WT% | XRF |
| FEO | 2.38 | | WT% | XRF |
| MGO | 0.65 | | WT% | XRF |
| CAO | 1.88 | | WT% | XRF |
| NA2O | 6.83 | | WT% | EPMA |
| K2O | 6.02 | | WT% | XRF |
| TIO2 | 0.3 | | WT% | XRF |
| P2O5 | 0.11 | | WT% | XRF |
| MNO | 0.3 | | WT% | XRF |
