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Sample T137
NavDat sample number 6906 · SYENITE
Sample
| Sample ID | T137 |
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| Rock name | SYENITE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | aphanitic holocrystalline groundmass with phenocrysts of plagioclase, hornblende, biotite, and rare aegirine-augite; groundmass composed of lath-shaped orthoclase arranged in trachytic texture, interstitial quartz; glomerophyric |
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Location
| Latitude | 44.3675 |
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| Longitude | -104.072 |
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| Location | Black Hills |
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| State / province | Wyoming |
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| Volcanic field | Tinton District |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 48 |
|
38 |
59 |
|
|
