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Sample T31
NavDat sample number 6806 · PHONOLITE
Sample
| Sample ID | T31 |
|---|
| Rock name | PHONOLITE |
|---|
| Rock type | VOLCANIC |
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| Composition | INTERMEDIATE |
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| Material | IGNEOUS |
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| Comment | holocrystalline; aphanitic groundmass of albite, microcline, aegirine, analcime, calcite, zeolite, hematite, clay; coarse phenocrysts of anorthoclase, aegirine-augite, nepheline, analcime, nosean |
|---|
Location
| Latitude | 44.5906 |
|---|
| Longitude | -104.715 |
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| Location | Devils Tower |
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| State / province | Wyoming |
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| Volcanic field | Devils Tower phonolite |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 41.6 |
|
40 |
43.2 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 61.85 | | WT% | XRF |
| AL2O3 | 19.76 | | WT% | XRF |
| FE2O3 | 1.96 | | WT% | XRF |
| FEO | 1.56 | | WT% | XRF |
| MGO | 0.28 | | WT% | XRF |
| CAO | 1.2 | | WT% | XRF |
| NA2O | 7.82 | | WT% | EPMA |
| K2O | 4.96 | | WT% | XRF |
| TIO2 | 0.46 | | WT% | XRF |
| P2O5 | 0.08 | | WT% | XRF |
| MNO | 0.08 | | WT% | XRF |
