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Sample 16-439C
NavDat sample number 11093 · TRACHYTE
Sample
| Sample ID | 16-439C |
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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 | 44.4899 |
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| Longitude | -104.429 |
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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 | 55.81 | | WT% | XRF |
| AL2O3 | 14.54 | | WT% | XRF |
| FE2O3T | 5.04 | | WT% | XRF |
| MGO | 0.07 | | WT% | XRF |
| CAO | 0.36 | | WT% | XRF |
| NA2O | 0.46 | | WT% | XRF |
| K2O | 12.14 | | WT% | XRF |
| TIO2 | 0.93 | | WT% | XRF |
| P2O5 | 0.24 | | WT% | XRF |
| MNO | 0.25 | | WT% | XRF |
| TOTAL | 89.84 | | WT% | XRF |
