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Sample JM-31
NavDat sample number 9430 · MONZONITE
Sample
| Sample ID | JM-31 |
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| Rock name | MONZONITE |
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| Rock type | PLUTONIC |
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| Composition | FELSIC |
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| Material | IGNEOUS |
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| Comment | fine-grained, porphyritic; less than 2% K-feldspar megacrysts; other phenocrysts of andesine, hornblende, biotite, diopsidic aegirine-augite, quartz; groundmass largely of plagioclase, quartz, and orthoclase compoase groundmass |
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Location
| Latitude | 47.2494 |
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| Longitude | -109.082 |
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| State / province | Montana |
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| Volcanic field | Linster Peak Dome |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
|---|
| 68.5 |
|
68 |
69 |
|
|
Analyses
Whole rock
| Item | Value | Std. dev. | Unit | Method |
|---|
| SIO2 | 63.01 | | WT% | XRF |
| AL2O3 | 18.97 | | WT% | XRF |
| TIO2 | 0.35 | | WT% | XRF |
| FEOT | 3.48 | | WT% | XRF |
| MNO | 0.12 | | WT% | XRF |
| CAO | 5.48 | | WT% | XRF |
| MGO | 0.77 | | WT% | XRF |
| K2O | 2.94 | | WT% | XRF |
| NA2O | 4.73 | | WT% | XRF |
| P2O5 | 0.15 | | WT% | XRF |
| TOTAL | 100 | | WT% | XRF |
| RB | 46 | | PPM | XRF |
| SR | 528 | | PPM | XRF |
