Sample RP-4
NavDat sample number 4786 · RHYOLITE
Sample
| Sample ID | RP-4 |
|---|---|
| Rock name | RHYOLITE |
| Rock type | VOLCANIC |
| Composition | FELSIC |
| Material | IGNEOUS |
| Comment | 70 to 75% aphanitic groundmass of equal proportions of albite and orthoclase, along with quartz; groundmass also contains 2% to 3% opaques; phenocrysts are anorthoclase laths |
Location
| Latitude | 44.402 |
|---|---|
| Longitude | -103.679 |
| 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 | 68.5 | WT% | NAA | |
| AL2O3 | 16.05 | WT% | NAA | |
| FE2O3 | 1.45 | WT% | NAA | |
| MGO | 2.67 | WT% | NAA | |
| CAO | 0.39 | WT% | NAA | |
| NA2O | 5.04 | WT% | NAA | |
| K2O | 5.6 | WT% | NAA | |
| TIO2 | 0.2 | WT% | NAA | |
| MNO | 0.04 | WT% | NAA | |
| BAO | 0.06 | WT% | NAA | |
| BA | 499.4 | PPM | NAA | |
| CE | 277.2 | PPM | NAA | |
| CO | 1.1 | PPM | NAA | |
| EU | 3.3 | PPM | NAA | |
| HF | 9.8 | PPM | NAA | |
| LA | 162.2 | PPM | NAA | |
| LU | 0.5 | PPM | NAA | |
| RB | 136.9 | PPM | NAA | |
| SC | 0.2 | PPM | NAA | |
| SM | 11.4 | PPM | NAA | |
| TH | 72.8 | PPM | NAA | |
| V | 17 | PPM | NAA | |
| YB | 3.7 | PPM | NAA |