← Search
Sample USGSM-B271
NavDat sample number 2889 · DACITE
Sample
| Sample ID | USGSM-B271 |
|---|
| Rock name | DACITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | Reddish-gray porphyritic dacite, with phenocrysts of plagioclase and hornblende in a fine-grained groundmass which shows partial recrystallization and development of chlorite and addition of K-feldspar. The plagioclase has hematite-coating fractures and appears reddish in hand specimen. Some of the hornblende if altered to chlorite. Same intrusive body as sample USGSM-856-8. |
|---|
Location
| Latitude | 38.2152 |
|---|
| Longitude | -119.002 |
|---|
| Location | Mono County, CA |
|---|
| State / province | California |
|---|
| Volcanic field | Bodie Mining District and Bodie Hills Volcanic Field |
|---|
| Location comment | Standard shaft dump, Standard Hill |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 8.7 |
|
8.4 |
9 |
|
|
Analyses
No chemical analyses are stored for this sample.
