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Sample W-55
NavDat sample number 37039 · ANDESITE
Sample
| Sample ID | W-55 |
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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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| Comment | Roadcut in lava flow. Reversed-polarity. Correspsonds to Wise locality 55 Wise, 1969. Highly plagioclase-phyric 30-35%, two-pyroxene andesite with rare opaque minerals and olivine phenocrysts in a very fine grained intergranular to holocrystalline groundmass; plagioclase and pyroxene phenocrysts show evidence of disequilibrium; traces of alteration among fractures |
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Location
| Latitude | 45.2908 |
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| Longitude | -121.565 |
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| State / province | Oregon |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 2.1 |
|
2.06 |
2.14 |
|
|
Analyses
No chemical analyses are stored for this sample.
