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Sample 27-172A
NavDat sample number 11096 · TRACHYTE
Sample
| Sample ID | 27-172A |
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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 | strongly metasomatized; holocrystalline, porphyritic; groundmass of sanidine microlites, cryptocrystalline albite and anorthoclase is very fine grained to aphanitic and composes 40 to 70% of rock; phenocrysts are sanidine, altered feldspathoid and completely altered pyroxene |
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Location
| Latitude | 44.4653 |
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| Longitude | -104.411 |
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| Location | Bear Lodge Mountains |
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| State / province | Wyoming |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 44 |
|
38 |
50 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 55.49 | | WT% | XRF |
| AL2O3 | 23.47 | | WT% | XRF |
| FE2O3T | 2.47 | | WT% | XRF |
| MGO | 0.26 | | WT% | XRF |
| CAO | 0.11 | | WT% | XRF |
| NA2O | 0.37 | | WT% | XRF |
| K2O | 13.11 | | WT% | XRF |
| TIO2 | 0.23 | | WT% | XRF |
| P2O5 | 0.03 | | WT% | XRF |
| MNO | 0.11 | | WT% | XRF |
| TOTAL | 95.65 | | WT% | XRF |
