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Sample CBM-7
NavDat sample number 9443 · TRACHYTE
Sample
| Sample ID | CBM-7 |
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| Rock name | TRACHYTE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | occurs as dikes, sills, and small intrusive masses; excellent trachytic texture defined by sanidine, the dominant mineral, in phenocrysts; also contains aegerine-augite, melanite, and analcite; groundmass comprises at least 70% of rock and consists mainly of sanidine and aegerine |
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Location
| Latitude | 47.2228 |
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| Longitude | -109.071 |
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| State / province | Montana |
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| Volcanic field | Linster Peak Dome |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 67 |
|
64 |
69 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| RB | 300 | | PPM | XRF |
| SR | 519 | | PPM | XRF |
