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Sample 1-88
NavDat sample number 4748 · RHYOLITE
Sample
| Sample ID | 1-88 |
|---|
| 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 | 44.3796 |
|---|
| Longitude | -103.768 |
|---|
| 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 | 19.0307 | | WT% | NAA |
| FE2O3 | 1.0171 | | WT% | NAA |
| MGO | 2.708 | | WT% | NAA |
| CAO | 1.0725 | | WT% | NAA |
| NA2O | 10.5702 | | WT% | NAA |
| TIO2 | 0.4215 | | WT% | NAA |
| MNO | 0.0918 | | WT% | NAA |
| BA | 526.06 | | PPM | NAA |
| CE | 152.181 | | PPM | NAA |
| CO | 2.0562 | | PPM | NAA |
| CR | 5.4683 | | PPM | NAA |
| CS | 10.0521 | | PPM | NAA |
| EU | 2.3173 | | PPM | NAA |
| HF | 9.0131 | | PPM | NAA |
| LA | 148.299 | | PPM | NAA |
| LU | 1.01 | | PPM | NAA |
| RB | 76.9809 | | PPM | NAA |
| SB | 0.4692 | | PPM | NAA |
| SC | 1.1766 | | PPM | NAA |
| SM | 13.4824 | | PPM | NAA |
| TA | 1.8761 | | PPM | NAA |
| TH | 61.3155 | | PPM | NAA |
| V | 41.9376 | | PPM | NAA |
| YB | 4.3801 | | PPM | NAA |
