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Sample 21-71
NavDat sample number 11138 · TRACHYTE
Sample
| Sample ID | 21-71 |
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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; porphyritic; groundmass of sanidine, albite, and anorthoclase is aphanitic to very fine grained, composing 60 to 95% of rock; phenocrysts of sanidine, albite, altered amphibole and pyroxene |
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Location
| Latitude | 44.478 |
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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 | 56.39 | | WT% | XRF |
| AL2O3 | 15.55 | | WT% | XRF |
| FE2O3T | 3.33 | | WT% | XRF |
| MGO | 0.17 | | WT% | XRF |
| CAO | 0.23 | | WT% | XRF |
| NA2O | 0.63 | | WT% | XRF |
| K2O | 13.55 | | WT% | XRF |
| TIO2 | 0.48 | | WT% | XRF |
| P2O5 | 0.15 | | WT% | XRF |
| MNO | 0.21 | | WT% | XRF |
| TOTAL | 90.69 | | WT% | XRF |
