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Sample JM-82
NavDat sample number 9440 · SYENITE
Sample
| Sample ID | JM-82 |
|---|
| Rock name | SYENITE |
|---|
| Rock type | PLUTONIC |
|---|
| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
|---|
| Comment | trachytic orientation of sanidine; phenocrysts of sanidine, aegerine-augite; also contains analcite, melanite; groundmass composed primarily of sanidine, aegerine, and nepheline |
|---|
Location
| Latitude | 47.2444 |
|---|
| Longitude | -109.025 |
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| State / province | Montana |
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| Volcanic field | Linster Peak Dome |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 67 |
|
64 |
69 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 60.5 | | WT% | XRF |
| AL2O3 | 17.92 | | WT% | XRF |
| TIO2 | 0.58 | | WT% | XRF |
| FEOT | 4.79 | | WT% | XRF |
| MNO | 0.15 | | WT% | XRF |
| CAO | 2.93 | | WT% | XRF |
| MGO | 0.93 | | WT% | XRF |
| K2O | 7.24 | | WT% | XRF |
| NA2O | 4.83 | | WT% | XRF |
| P2O5 | 0.13 | | WT% | XRF |
| TOTAL | 100 | | WT% | XRF |
| RB | 225 | | PPM | XRF |
| SR | 842 | | PPM | XRF |
