Sample GP-1
NavDat sample number 4790 · PHONOLITE
Sample
| Sample ID | GP-1 |
|---|---|
| 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 | 44.3916 |
|---|---|
| Longitude | -103.687 |
| 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 | 56.35 | WT% | NAA | |
| AL2O3 | 19.47 | WT% | NAA | |
| FE2O3 | 6.91 | WT% | NAA | |
| MGO | 3.01 | WT% | NAA | |
| CAO | 2.7 | WT% | NAA | |
| NA2O | 4.72 | WT% | NAA | |
| K2O | 5.68 | WT% | NAA | |
| TIO2 | 0.79 | WT% | NAA | |
| MNO | 0.01 | WT% | NAA | |
| BAO | 0.08 | WT% | NAA | |
| BA | 706.5 | PPM | NAA | |
| CE | 204.7 | PPM | NAA | |
| CO | 4.8 | PPM | NAA | |
| EU | 5.7 | PPM | NAA | |
| HF | 6.3 | PPM | NAA | |
| LA | 68 | PPM | NAA | |
| LU | 0.3 | PPM | NAA | |
| RB | 33.7 | PPM | NAA | |
| SC | 1.2 | PPM | NAA | |
| SM | 10.8 | PPM | NAA | |
| TH | 20.6 | PPM | NAA | |
| V | 65.7 | PPM | NAA | |
| YB | 2.8 | PPM | NAA |