Sample 91
NavDat sample number 11356 · TRACHYTE
Sample
| Sample ID | 91 |
|---|---|
| Rock name | TRACHYTE |
| Rock type | VOLCANIC |
| Composition | INTERMEDIATE |
| Material | IGNEOUS |
| Comment | porphyritic; phenocrysts form flow foliation; holocrystalline matrix of anorthoclase-Na sanidine, clinopyroxene, and magnetite; phenocrysts are feldspar, amphibole, pyroxene, magnetite-ulvospinel, and minor biotite |
Location
| Latitude | 42.7233 |
|---|---|
| Longitude | -107.321 |
| Location | Rattlesnake Hills |
| State / province | Wyoming |
| Volcanic field | alkali trachyte |
Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|---|---|---|---|---|
| 43.6 | 41.4 | 46.6 |
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|---|---|---|---|
| SIO2 | 56.28 | WT% | XRF | |
| AL2O3 | 16.66 | WT% | XRF | |
| FE2O3 | 4 | WT% | XRF | |
| FEO | 2.32 | WT% | TIT | |
| CAO | 5.61 | WT% | XRF | |
| MGO | 2.57 | WT% | XRF | |
| NA2O | 5 | WT% | XRF | |
| K2O | 4.74 | WT% | XRF | |
| TIO2 | 0.86 | WT% | XRF | |
| MNO | 0.17 | WT% | XRF | |
| P2O5 | 0.39 | WT% | XRF | |
| H2O | 1.42 | WT% | PENFIELD | |
| TOTAL | 100.02 | WT% | XRF | |
| RB | 94 | PPM | XRF | |
| SR | 1367 | PPM | XRF | |
| Y | 30 | PPM | XRF | |
| ZR | 338 | PPM | XRF | |
| LA | 59 | PPM | XRF | |
| CE | 128 | PPM | NAA | |
| ND | 74 | PPM | NAA | |
| SM | 13 | PPM | NAA | |
| EU | 3.8 | PPM | NAA | |
| TB | 1 | PPM | NAA | |
| DY | 6 | PPM | NAA | |
| YB | 3 | PPM | NAA | |
| LU | 0.4 | PPM | NAA | |
| LA | 53 | PPM | NAA | |
| U | 3.2 | PPM | NAA | |
| TH | 14 | PPM | NAA | |
| CU | 32 | PPM | AAS | |
| CR | 39 | PPM | AAS | |
| NI | 92 | PPM | AAS | |
| ZN | 113 | PPM | AAS |