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Sample 1-47
NavDat sample number 4724 · RHYOLITE
Sample
| Sample ID | 1-47 |
|---|
| 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 | 44.3101 |
|---|
| Longitude | -103.795 |
|---|
| 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 | 20.7214 | | WT% | NAA |
| FE2O3 | 0.8859 | | WT% | NAA |
| MGO | 1.319 | | WT% | NAA |
| CAO | 1.3542 | | WT% | NAA |
| NA2O | 6.8813 | | WT% | NAA |
| TIO2 | 0.466 | | WT% | NAA |
| MNO | 0.1074 | | WT% | NAA |
| BA | 603 | | PPM | NAA |
| CE | 151.927 | | PPM | NAA |
| CO | 2.8775 | | PPM | NAA |
| CR | 11.545 | | PPM | NAA |
| CS | 9.399 | | PPM | NAA |
| EU | 2.6727 | | PPM | NAA |
| HF | 0.8581 | | PPM | NAA |
| LA | 49.2411 | | PPM | NAA |
| LU | 0.5738 | | PPM | NAA |
| RB | 109.089 | | PPM | NAA |
| SB | 0.4877 | | PPM | NAA |
| SC | 1.7476 | | PPM | NAA |
| SM | 9.9563 | | PPM | NAA |
| TA | 2.5373 | | PPM | NAA |
| TH | 58.3393 | | PPM | NAA |
| V | 58.4658 | | PPM | NAA |
| YB | 3.6734 | | PPM | NAA |
