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Sample OWT-1
NavDat sample number 7140 · PYROCLASTIC FLOW
Sample
| Sample ID | OWT-1 |
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| Rock name | PYROCLASTIC FLOW |
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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 | H.F. Bonham, Nevada Bureau of Mines and Geology. |
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| Comment | Altered welded tuff, with phenocrysts of cloudy feldspar with many inclusions, large amounts of iron oxide and some epidote; tuff of Ralston Valley. Feldspar phenocrysts are cloudy and inclusion-filled. The alkali-feldspar age is interpreted as an alteration age. The fission track zircon age is probably closer to the age of emplacement, as zircon appears to resist annealing during post-crystallization hydrothermal alteration Ashely and Silberman, 1976. |
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Location
| Latitude | 38.1908 |
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| Longitude | -117.041 |
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| Location | Nye Co., NV |
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| State / province | Nevada |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 18.6 |
|
18.1 |
19.1 |
|
alkali feldspar M.L. Silberman, U.S. Geological Survey; zircon R.P. Ashley, U.S. Geological Survey. |
Analyses
No chemical analyses are stored for this sample.
