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Sample 7
NavDat sample number 4457 · GRANITE
Sample
| Sample ID | 7 |
|---|
| Rock name | GRANITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | FELSIC |
|---|
| Material | IGNEOUS |
|---|
| Comment | phenocrysts of of albite, microcline, orthoclase, quartz, and aegerine-augite; groundmass of albite and minor amounts of orthoclase, apatite, magnetite, biotite, and quartz |
|---|
Location
| Latitude | 44.389 |
|---|
| Longitude | -103.733 |
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| Location | Theodore Roosevelt |
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| State / province | South Dakota |
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| Volcanic field | Theodore Roosevelt grorudite |
|---|
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 50 |
|
45 |
55 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 53 | | WT% | GRAV |
| NA2O | 6 | | WT% | AAS |
| MGO | 0.036 | | WT% | AAS |
| K2O | 4 | | WT% | AAS |
| CAO | 0.21 | | WT% | AAS |
| SR87_SR86 | 0.7159 | | | MS |
