Sample GP-3
NavDat sample number 4792 · PHONOLITE
Sample
| Sample ID | GP-3 |
|---|---|
| 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 | 44.3918 |
|---|---|
| Longitude | -103.692 |
| 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 | 55.4 | WT% | NAA | |
| AL2O3 | 19.42 | WT% | NAA | |
| FE2O3 | 6.98 | WT% | NAA | |
| MGO | 3.37 | WT% | NAA | |
| CAO | 2.74 | WT% | NAA | |
| NA2O | 5.66 | WT% | NAA | |
| K2O | 5.51 | WT% | NAA | |
| TIO2 | 0.51 | WT% | NAA | |
| MNO | 0.29 | WT% | NAA | |
| BAO | 0.13 | WT% | NAA | |
| BA | 1200.4 | PPM | NAA | |
| CE | 223.5 | PPM | NAA | |
| CO | 5.4 | PPM | NAA | |
| EU | 6.1 | PPM | NAA | |
| HF | 7.1 | PPM | NAA | |
| LA | 137 | PPM | NAA | |
| LU | 0.7 | PPM | NAA | |
| RB | 52 | PPM | NAA | |
| SC | 2.3 | PPM | NAA | |
| SM | 21.2 | PPM | NAA | |
| TH | 29.5 | PPM | NAA | |
| V | 53.1 | PPM | NAA | |
| YB | 6 | PPM | NAA |