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Sample 1
NavDat sample number 4363 · VITROPHERE
Sample
| Sample ID | 1 |
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| Alternate ID | 762A |
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| Rock name | VITROPHERE |
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| Rock type | VOLCANIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | Basal vitrophyre of vent tuff collected about 200 m south of fissure; homogeneous glass; 10 percent phenocrysts comprising the following percentages of minerals: quartz, 22; alkali feldspar, 47; plagioclase, 27; biotite, 1; opaque minerals, 2.2. Accessories include 1 grain allanite per thin section. |
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Location
| Latitude | 38.8926 |
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| Longitude | -118.183 |
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| Location | Gabbs Valley, northeastern Mineral County, NV |
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| State / province | Nevada |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 26 |
|
25.1 |
26.9 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 75.1 | | WT% | XRF |
| AL2O3 | 14.21 | | WT% | XRF |
| FEO | 1.19 | | WT% | XRF |
| MGO | 0.02 | | WT% | AAS |
| CAO | 0.58 | | WT% | AAS |
| NA2O | 3.61 | | WT% | AAS |
| K2O | 5.13 | | WT% | AAS |
| TIO2 | 0.13 | | WT% | XRF |
| MNO | 0.03 | | WT% | XRF |
