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Sample USGS-D2405H , USGS-D2405P1
NavDat sample number 4959 · ANDESITE
Sample
| Sample ID | USGS-D2405H , USGS-D2405P1 |
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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 | R.C. Speed and A.H. Cogbill, Northwestern Univ. |
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| Comment | Porphyritic andesite lava composed of plagioclase phenocrysts 95% with minor brown hornblende and clinopyroxene phenocrysts in a felsic groundmass 5% of feldspar, pyroxene, ore, and various felsic devitrification products. |
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Location
| Latitude | 38.2419 |
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| Longitude | -118.144 |
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| Location | Mineral County |
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| State / province | Nevada |
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| Volcanic field | Mina-Candelaria Region |
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| Location comment | top of cliff on N. side of Nevada Highway 10 |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 17.4 |
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16.8 |
18 |
|
R.F. Marvin, H.H. Mehnert, and V.M. Merritt, U.S. Geological Survey |
Analyses
No chemical analyses are stored for this sample.
