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Sample USGSDVA-217
NavDat sample number 19136 · RHYOLITE
Sample
| Sample ID | USGSDVA-217 |
|---|
| Rock name | RHYOLITE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Collected by | R.E. Van Alstine |
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| Comment | dike that has sparse phenocrysts in a cryptocrystalline groundmass of feldspar and quartz; calculated age appears to be too old |
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Location
| Latitude | 38.4917 |
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| Longitude | -106.061 |
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| Location | N side of Poncha Mountain; Chaffee County |
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| State / province | Colorado |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 90 |
|
86.9 |
93.1 |
|
|
Analyses
No chemical analyses are stored for this sample.
References
- Marvin, Richard F; Mehnert, Harald H; Naeser, Charles W; Zartman,Robert E (1989) U. S. Geological Survey radiometric ages; Compilation C; Part five;Colorado, Montana, Utah, and Wyoming. Isochron/West, vol.53, pp.14-19, Jun 1989
