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Sample 1-63
NavDat sample number 4732 · RHYOLITE
Sample
| Sample ID | 1-63 |
|---|
| Rock name | RHYOLITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | a few plagioclase phenocrysts in an aphanitic groundmass; groundmass is extremely fine and primarily composed of orthoclase and quartz; pyroxenes also present |
|---|
Location
| Latitude | 44.2847 |
|---|
| Longitude | -103.764 |
|---|
| State / province | South Dakota |
|---|
| Volcanic field | Black Hill Tertiary igneous province |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 47 |
|
40 |
55 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| AL2O3 | 17.2164 | | WT% | NAA |
| FE2O3 | 0.4055 | | WT% | NAA |
| MGO | 2.4019 | | WT% | NAA |
| CAO | 0.3847 | | WT% | NAA |
| NA2O | 3.4217 | | WT% | NAA |
| TIO2 | 0.437 | | WT% | NAA |
| MNO | 0.0491 | | WT% | NAA |
| BA | 550.49 | | PPM | NAA |
| CE | 37.476 | | PPM | NAA |
| CO | 1.0982 | | PPM | NAA |
| CR | 4.6624 | | PPM | NAA |
| CS | 7.5799 | | PPM | NAA |
| EU | 0.994 | | PPM | NAA |
| HF | 3.4113 | | PPM | NAA |
| LA | 24.1177 | | PPM | NAA |
| LU | 0.1005 | | PPM | NAA |
| RB | 107.715 | | PPM | NAA |
| SB | 0.2654 | | PPM | NAA |
| SC | 0.9423 | | PPM | NAA |
| SM | 4.1434 | | PPM | NAA |
| TA | 1.7694 | | PPM | NAA |
| TH | 12.9912 | | PPM | NAA |
| V | 11.0744 | | PPM | NAA |
| YB | 0.5979 | | PPM | NAA |
