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Sample USGSD-M500-1
NavDat sample number 10036 · GRANITE
Sample
| Sample ID | USGSD-M500-1 |
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| Rock name | GRANITE |
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| Rock type | PLUTONIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | medium to coarse grained, homogeneous, 2 mica granite; conspicuous biotite; much rarer, uniformly distributed muscovite; euhedral plagioclase; strongly perthitic K-feldspar; subhedral to euhedral quartz; same granite unit as USGSD-M32-1-4 |
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Location
| Latitude | 45.65 |
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| Longitude | -112.995 |
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| Location | loose block on cirque floor at 8680 ft elevation, just S of small pond N of Black Lion Mountain; 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 |
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| 64.6 |
|
62.5 |
66.7 |
|
|
Analyses
No chemical analyses are stored for this sample.
