← Search
Sample USGSD-M1272-2
NavDat sample number 10030 · GRANODIORITE
Sample
| Sample ID | USGSD-M1272-2 |
|---|
| Rock name | GRANODIORITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Comment | medium grained, uniform; conspicuous hornblende and biotite, abundant but small sphene, plagioclase and smoky quartz, K-feldspar megacrysts; faint magmatic foliation defined by mafic minerals |
|---|
Location
| Latitude | 45.545 |
|---|
| Longitude | -112.977 |
|---|
| Location | large loose block at base of the W face of Tahepia Mountain at 8920 ft elevation; Beaverhead County |
|---|
| State / province | Montana |
|---|
| Volcanic field | Pioneer Batholith |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 68.8 |
|
64.6 |
73 |
|
|
Analyses
No chemical analyses are stored for this sample.
