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Sample L-1025a
NavDat sample number 3871 · MONZONITE
Sample
| Sample ID | L-1025a |
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| Rock name | MONZONITE |
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| Rock type | PLUTONIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Collected by | author |
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| Comment | phenocrysts of plagioclase, orthoclase, hornblende rare, severely altered to biotite, biotite primary; groundmass of quartz, orthoclase, biotite |
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Location
| Latitude | 46.5758 |
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| Longitude | -112.244 |
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| Location | along US Route 12, 5 miles E of McDonald Pass; Lewis and Clark County |
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| State / province | Montana |
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| Volcanic field | Boulder batholith |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 74.5 |
|
72.3 |
76.7 |
|
|
Analyses
No chemical analyses are stored for this sample.
