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Sample MB174*
NavDat sample number 6816 · PHONOLITE
Sample
| Sample ID | MB174* |
|---|
| Rock name | PHONOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Comment | holocrystalline; aphanitic groundmass of sanidine, aegirine, analcime, zeolite, and clay; phenocrysts of sanidine, aegirine-augite, nepheline, analcime |
|---|
Location
| Latitude | 44.6191 |
|---|
| Longitude | -104.771 |
|---|
| Location | Missouri Buttes |
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| State / province | Wyoming |
|---|
| Volcanic field | Missouri Buttes phonolite |
|---|
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 | 61.22 | | WT% | XRF |
| AL2O3 | 20.06 | | WT% | XRF |
| FE2O3 | 1.71 | | WT% | XRF |
| FEO | 1.48 | | WT% | XRF |
| MGO | 0.49 | | WT% | XRF |
| CAO | 1 | | WT% | XRF |
| NA2O | 8.44 | | WT% | EPMA |
| K2O | 5.02 | | WT% | XRF |
| TIO2 | 0.21 | | WT% | XRF |
| P2O5 | 0.08 | | WT% | XRF |
| MNO | 0.3 | | WT% | XRF |
