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Sample USGSD-M121-1
NavDat sample number 10028 · GRANODIORITE
Sample
| Sample ID | USGSD-M121-1 |
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| Rock name | GRANODIORITE |
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| Rock type | PLUTONIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | medium to coarse grained, generally uniformly textured; prominent hornblende and biotite, sphene, and large K-feldspar megacrysts that are anhedral and inclusion-rich; from a transition zone between a granite and granodiorite where magmatic mixing probably occurred |
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Location
| Latitude | 45.5206 |
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| Longitude | -112.957 |
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| Location | loose block from blasted outcrop at 9100 ft elevation on trail to Tendoy Lake; 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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| 71.3 |
|
66.8 |
75.8 |
|
|
Analyses
No chemical analyses are stored for this sample.
