← Search
Sample USGSD-M1293-1
NavDat sample number 10031 · GRANITE
Sample
| Sample ID | USGSD-M1293-1 |
|---|
| Rock name | GRANITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | medium to coarse grained; biotite is major mafic mineral but hornblende is clearly visible in hand specimen along with sphene; plagioclase, smoky quartz; subhedral K-feldspar phenocrysts, nearly free of inclusions |
|---|
Location
| Latitude | 45.5778 |
|---|
| Longitude | -112.928 |
|---|
| Location | loose block in large, fresh felsenmeer at 8780 ft elevation at base of high cliffs, NW of Granite Mountain; Beaverhead County |
|---|
| State / province | Montana |
|---|
| Volcanic field | Pioneer Batholith |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 74.1 |
|
71.4 |
76.8 |
|
|
Analyses
No chemical analyses are stored for this sample.
