← Search
Sample MB150
NavDat sample number 6831 · TRACHYTE
Sample
| Sample ID | MB150 |
|---|
| Rock name | TRACHYTE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Comment | holocrystalline; aphanitic groundmass of sanidine, analcime, aegirine, calcite, hematite, zeolite; phenocrysts of sanidine, aegirine-augite, anorthoclase, sphene, nepheline, nosean |
|---|
Location
| Latitude | 44.6107 |
|---|
| Longitude | -104.781 |
|---|
| Location | Missouri Buttes |
|---|
| 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 | 61.14 | | WT% | XRF |
| AL2O3 | 19.9 | | WT% | XRF |
| FE2O3 | 1.98 | | WT% | XRF |
| FEO | 1.82 | | WT% | XRF |
| MGO | 0.88 | | WT% | XRF |
| CAO | 1.54 | | WT% | XRF |
| NA2O | 6.71 | | WT% | EPMA |
| K2O | 5.02 | | WT% | XRF |
| TIO2 | 0.48 | | WT% | XRF |
| P2O5 | 0.06 | | WT% | XRF |
| MNO | 0.34 | | WT% | XRF |
