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Sample JM-105
NavDat sample number 9426 · TRACHYTE
Sample
| Sample ID | JM-105 |
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| Rock name | TRACHYTE |
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| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | occurs as dikes, sills, and small intrusive masses; excellent trachytic texture defined by sanidine, the dominant mineral, in phenocrysts; also contains aegerine-augite, melanite, and analcite; groundmass comprises at least 70% of rock and consists mainly of sanidine and aegerine |
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Location
| Latitude | 47.2494 |
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| Longitude | -109.079 |
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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 | 58.14 | | WT% | XRF |
| TIO2 | 0.25 | | WT% | XRF |
| AL2O3 | 18.98 | | WT% | XRF |
| FE2O3 | 1.96 | | WT% | TIT |
| FEO | 0.89 | | WT% | TIT |
| MNO | 0.07 | | WT% | XRF |
| MGO | 0.38 | | WT% | XRF |
| CAO | 0.8 | | WT% | XRF |
| NA2O | 5.94 | | WT% | AAS |
| K2O | 9.34 | | WT% | XRF |
| P2O5 | 0.02 | | WT% | XRF |
| LOI | 3.33 | | WT% | XRF |
| TOTAL | 100.1 | | WT% | XRF |
| RB | 288.5 | | PPM | XRF |
| SR | 876.3 | | PPM | XRF |
| Y | 12.4 | | PPM | XRF |
| ZR | 285.6 | | PPM | XRF |
| NB | 16.9 | | PPM | XRF |
| SIO2 | 62.08 | | WT% | XRF |
| AL2O3 | 19.64 | | WT% | XRF |
| TIO2 | 0.26 | | WT% | XRF |
| FEOT | 2.68 | | WT% | XRF |
| MNO | 0.07 | | WT% | XRF |
| CAO | 0.8 | | WT% | XRF |
| MGO | 0.51 | | WT% | XRF |
| K2O | 8.53 | | WT% | XRF |
| NA2O | 5.39 | | WT% | XRF |
| P2O5 | 0.04 | | WT% | XRF |
| TOTAL | 100 | | WT% | XRF |
| RB | 143 | | PPM | XRF |
| SR | 418 | | PPM | XRF |
