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Sample USGSD-M984-2
NavDat sample number 10039 · TONALITE
Sample
| Sample ID | USGSD-M984-2 |
|---|
| Rock name | TONALITE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | very dark, medium grained, uniform texture; hornblende is more abundant than biotite; sphene is sparse; igneous primary foliation weak to absent |
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Location
| Latitude | 45.7428 |
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| Longitude | -112.872 |
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| Location | conspicuous outcrop at 6700 ft elevation on W side of gully NW of Lime Kiln gulch; Beaverhead County |
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| State / province | Montana |
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| Volcanic field | Pioneer Batholith |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 77.1 |
|
74.3 |
79.9 |
|
|
Analyses
No chemical analyses are stored for this sample.
