Sample GP-2
NavDat sample number 4791 · PHONOLITE
Sample
| Sample ID | GP-2 |
|---|---|
| Rock name | PHONOLITE |
| Rock type | VOLCANIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | 45% of rock is aphanitic groundmass of plagioclase and orthoclase along with magnetite and apatite; phenocrysts of pyroxene; also contains some nepheline |
Location
| Latitude | 44.3911 |
|---|---|
| Longitude | -103.688 |
| State / province | South Dakota |
| Volcanic field | Black Hills Tertiary igneous province |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 54 | 50 | 58 |
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| SIO2 | 54.99 | WT% | NAA | |
| AL2O3 | 19.37 | WT% | NAA | |
| FE2O3 | 6.51 | WT% | NAA | |
| MGO | 4.3 | WT% | NAA | |
| CAO | 3.07 | WT% | NAA | |
| NA2O | 4.86 | WT% | NAA | |
| K2O | 5.48 | WT% | NAA | |
| TIO2 | 1 | WT% | NAA | |
| MNO | 0.27 | WT% | NAA | |
| BAO | 0.15 | WT% | NAA | |
| BA | 1328.2 | PPM | NAA | |
| CE | 198 | PPM | NAA | |
| CO | 5.1 | PPM | NAA | |
| EU | 5.6 | PPM | NAA | |
| HF | 5.9 | PPM | NAA | |
| LA | 123 | PPM | NAA | |
| LU | 0.5 | PPM | NAA | |
| RB | 52.5 | PPM | NAA | |
| SC | 2.1 | PPM | NAA | |
| SM | 19.7 | PPM | NAA | |
| TH | 26.5 | PPM | NAA | |
| V | 70.4 | PPM | NAA | |
| YB | 5 | PPM | NAA |