← Search
Sample USGSM-668-G10
NavDat sample number 3002 · ANDESITE
Sample
| Sample ID | USGSM-668-G10 |
|---|
| Rock name | ANDESITE |
|---|
| Rock type | VOLCANIC |
|---|
| Composition | INTERMEDIATE |
|---|
| Material | IGNEOUS |
|---|
| Collected by | F.J. Kleinhampl and M.L. Silberman, U.S. Geological Survey |
|---|
| Comment | Altered, mildly propylitized andesite, correlative with the mineralized andesite of the Aurora mining district. The hornblende occurs as large phenocrysts and apparently is not affected by the hydrothermal alteration which usually destroys the ferro-magnesium minerals. Chemical analysis suggests this rock has not suffered gain or loss of major elements. |
|---|
Location
| Latitude | 38.2403 |
|---|
| Longitude | -118.892 |
|---|
| Location | Aurora-Cedar Hill-Trench Canyon Alkali Valley Area |
|---|
| State / province | Nevada |
|---|
| Formation | Of Aurora mining district |
|---|
| Location comment | approximately 1 mi E of Calif. Border; Mineral County, NV |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 14.8 |
|
14.5 |
15.1 |
|
|
Analyses
No chemical analyses are stored for this sample.
