← Search
Sample MB128
NavDat sample number 6825 · PHONOLITE
Sample
| Sample ID | MB128 |
|---|
| Rock name | PHONOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Comment | holocrystalline; aphanitic groundmass of sanidine, aegirine, analcime, zeolite, magnetite, hematite; phenocrysts of sanidine, anorthoclase, aegirine-augite, nepheline, analcime, nosean |
|---|
Location
| Latitude | 44.6195 |
|---|
| Longitude | -104.781 |
|---|
| Location | Missouri Buttes |
|---|
| 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 | 61.73 | | WT% | XRF |
| AL2O3 | 19.84 | | WT% | XRF |
| FE2O3 | 1.89 | | WT% | XRF |
| FEO | 1.56 | | WT% | XRF |
| MGO | 0.42 | | WT% | XRF |
| CAO | 0.8 | | WT% | XRF |
| NA2O | 7.94 | | WT% | EPMA |
| K2O | 5.17 | | WT% | XRF |
| TIO2 | 0.39 | | WT% | XRF |
| MNO | 0.21 | | WT% | XRF |
