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Sample Y-B1-14
NavDat sample number 2907 · BASALT
Sample
| Sample ID | Y-B1-14 |
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| Rock name | BASALT |
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| Rock type | VOLCANIC |
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| Composition | MAFIC |
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| Material | IGNEOUS |
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| Collected by | Charles J. Vitaliano |
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| Comment | A black porphyritic rock with plagioclase phenocrysts up to 3 mm long, with weakly developed flow structure. Slightly vesicular, with vesicles partly to completely filled with carbonate. Zoned plagioclase phenocrysts An43-51 constitute 30% of the rock, olivine thoroughly iddingsitized 10%, and groundmass the remainder. The plagioclase phenocrysts have a 0.05-mm rim of more sodic plagioclase and contain numerous inclusions of phlogopite, olvine, and magnetite. Plagioclase microlites constitute more than half the trachytic groundmass; the rest is olivine iddingsitized, magnetite, hematite, and pyroxene, with accessory phlogopite and apatite. See Y-B1-1. |
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Location
| Latitude | 37.6958 |
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| Longitude | -117.247 |
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| Location | Esmeralda 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 | Malpais Basalt, top of uppermost flow; top of Malpais Mesa about 28 m above, and about 140 m SSW of Y-B1-2 |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 7.8 |
|
6.1 |
9.5 |
|
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Analyses
No chemical analyses are stored for this sample.
