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Sample MB203
NavDat sample number 6826 · PHONOLITE
Sample
| Sample ID | MB203 |
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| Rock name | PHONOLITE |
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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, aegirine, analcime, calcite, zeolite; coarse phenocrysts of sanidine, aegirine-augite, anorthoclase, nepheline, analcime, nosean |
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Location
| Latitude | 44.6121 |
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| Longitude | -104.774 |
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| Location | Missouri Buttes |
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| State / province | Wyoming |
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| Volcanic field | Missouri Buttes phonolite |
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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 | 60.84 | | WT% | XRF |
| AL2O3 | 19.4 | | WT% | XRF |
| FE2O3 | 1.92 | | WT% | XRF |
| FEO | 1.44 | | WT% | XRF |
| MGO | 0.92 | | WT% | XRF |
| CAO | 1.08 | | WT% | XRF |
| NA2O | 8.28 | | WT% | EPMA |
| K2O | 5.39 | | WT% | XRF |
| TIO2 | 0.42 | | WT% | XRF |
| P2O5 | 0.06 | | WT% | XRF |
| MNO | 0.15 | | WT% | XRF |
