← Search
Sample L-1023
NavDat sample number 3869 · DIORITE
Sample
| Sample ID | L-1023 |
|---|
| Rock name | DIORITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Collected by | author |
|---|
| Comment | medium grained, slightly porphyritic; phenocrysts of hornblende severely resorbed, loaded with inclusions and poikiliths of feldspar and biotite and biotite with same characteristics as hornblende along with some chloritization in addition; groundmass of abundant plagioclase laths and orthoclase |
|---|
Location
| Latitude | 45.7519 |
|---|
| Longitude | -112.755 |
|---|
| Location | along Montana Route 43, just W of the town of Divide; Silver Bow County |
|---|
| State / province | Montana |
|---|
| Volcanic field | Boulder batholith |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 79.4 |
|
77.1 |
81.7 |
|
|
Analyses
No chemical analyses are stored for this sample.
