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Sample Y-B1-2
NavDat sample number 2909 · BASALT
Sample
| Sample ID | Y-B1-2 |
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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 fine-grained porphyritic rock differing from Y-B1-1 mainly in the pronounced trachytic texture of the groundmass and different proportions of the phenocryst minerals labradorite 85-90%, olivine 10-15%, with an occasional grain of diopside, and the presence of scattered grains of phlogopite in the groundmass. The plagioclase phenocrysts are remarkably unaltered, whereas the plagioclase microlites are partly replaced by green fibrous chlorite. Chlorite is also developed in interstitial patches of phlogopite and orthoclase representing the final of crystallization. See Y-B1-1. |
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Location
| Latitude | 37.6958 |
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| Longitude | -117.244 |
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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, basal flow; NW wall of Pozo Canyon |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 7 |
|
5.5 |
8.5 |
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|
Analyses
No chemical analyses are stored for this sample.
