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Sample Y-B2-3
NavDat sample number 2914 · ANDESITE
Sample
| Sample ID | Y-B2-3 |
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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 | Charles J. Vitaliano |
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| Comment | Dark gray to black, meagerly porphyritic with aphanitic groundmass. Phenocrysts are of zoned plagioclase An50-70 up to 0.5 mm long, titanaugite, and iddingsitized olivine. In addition to microlites of plagioclase, pyroxene, and olivine, the groundmass contains accessory magnetite, phlogopite, and apatite. Minor amounts of secondary carbonate are present in the plagioclase. The plagioclase constitutes 70% of the rock, pyroxene 14%, and olivine 4%. See Y-58441. |
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Location
| Latitude | 37.6958 |
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| Longitude | -117.156 |
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| Location | Nye County, NV |
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| State / province | Nevada |
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| Volcanic field | Goldfield-Tonopah region, West-Central Nevada |
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| Location comment | Lower labradorite andesite flow of the capping of Blackcap Mountain; cliff face about 8 m above the base of the flow |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 13.2 |
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12 |
14.4 |
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Analyses
No chemical analyses are stored for this sample.
