← Search
Sample T021
NavDat sample number 6890 · SANNAITE
Sample
| Sample ID | T021 |
|---|
| Rock name | SANNAITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | MAFIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | occurs in dike; aphanitic, porphyritic; small phenocrysts of pyroxene and larger ones of biotite and opaques; groundmass of anhedral patches of analcime and radiating columnar aggregates of thompsonite; also K-feldspar in groundmass |
|---|
Location
| Latitude | 44.3507 |
|---|
| Longitude | -104.055 |
|---|
| Location | Black Hills |
|---|
| State / province | South Dakota |
|---|
| Volcanic field | Tinton District |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 48 |
|
38 |
59 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 46 | | WT% | XRF |
| AL2O3 | 14.4 | | WT% | XRF |
| FE2O3 | 3.3 | | WT% | XRF |
| FEO | 8.5 | | WT% | XRF |
| MGO | 4.5 | | WT% | XRF |
| CAO | 12.7 | | WT% | XRF |
| NA2O | 4.2 | | WT% | XRF |
| K2O | 3.1 | | WT% | XRF |
| TIO2 | 1.8 | | WT% | XRF |
| P2O5 | 1.4 | | WT% | XRF |
| MNO | 0.2 | | WT% | XRF |
| SO3 | 0.1 | | WT% | XRF |
