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Sample CH82-24A
NavDat sample number 11443 · BASALTIC-ANDESITE
Sample
| Sample ID | CH82-24A |
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| Rock name | BASALTIC-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 | cryptocrystalline oxide-rich matrix exhibiting light and dark banding; abundant microphenocrysts of plagioclase with clay/calcite alteration; laths of opx with altered cpx rims; scattered microphenocrysts of fresh and altered cpx and oxide; minor glomeroporphyritic clumps of cpx and plagioclase |
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Location
| Latitude | 42.6025 |
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| Longitude | -118.538 |
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| Location | basal flow directly above thick sequence of ash along Little Alvord Creek valley, E face Steens Mtn; Harney County |
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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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| 23.7 |
|
22.4 |
25 |
|
|
