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Sample 1-65
NavDat sample number 4733 · RHYOLITE
Sample
| Sample ID | 1-65 |
|---|
| 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 | 44.2944 |
|---|
| Longitude | -103.77 |
|---|
| 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 | 16.7035 | | WT% | NAA |
| FE2O3 | 0.4334 | | WT% | NAA |
| MGO | 1.9385 | | WT% | NAA |
| CAO | 0.6148 | | WT% | NAA |
| NA2O | 3.5319 | | WT% | NAA |
| TIO2 | 0.3911 | | WT% | NAA |
| MNO | 0.0474 | | WT% | NAA |
| BA | 445.125 | | PPM | NAA |
| CE | 33.056 | | PPM | NAA |
| CO | 0.8169 | | PPM | NAA |
| CR | 3.3904 | | PPM | NAA |
| CS | 4.3189 | | PPM | NAA |
| EU | 1.0326 | | PPM | NAA |
| HF | 3.1161 | | PPM | NAA |
| LA | 28.7891 | | PPM | NAA |
| LU | 0.1495 | | PPM | NAA |
| RB | 105.314 | | PPM | NAA |
| SB | 0.1502 | | PPM | NAA |
| SC | 0.8152 | | PPM | NAA |
| SM | 5.0093 | | PPM | NAA |
| TA | 1.7907 | | PPM | NAA |
| TH | 12.2624 | | PPM | NAA |
| V | 9.9388 | | PPM | NAA |
| YB | 0.6894 | | PPM | NAA |
