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Sample GL-2
NavDat sample number 4151 · ANDESITE
Sample
| Sample ID | GL-2 |
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| Rock name | ANDESITE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Collected by | M.L. Silberman, U.S. Geological Survey |
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| Comment | The plagioclase and biotite ages are discordant. The plagioclase has thin coatings of iron oxide on fractures and partings, giving them a reddish appearance in hand specimen. They also contain some glass inclusions. Plagioclases with glass inclusions frequently give ages discordant with coexisting minerals M.L. Silberman, unpub. data. The biotite age agrees with an age of biotite from another sample of Gilbert Andesite reported by Albers and Stewart 1972. |
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Location
| Latitude | 37.1328 |
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| Longitude | -117.708 |
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| Location | Esmeralda County, 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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| 14 |
|
13.6 |
14.4 |
|
M.L. Silberman, U.S. Geological Survey |
Analyses
No chemical analyses are stored for this sample.
