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Sample JM-42
NavDat sample number 9433 · MONZONITE
Sample
| Sample ID | JM-42 |
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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 | coarse-grained; > 2% orthoclase megacrysts; dominant phenocryst is andesine; also contains hornblende, diopsidic-aegerine-augite, biotite, and quartz; groundmass is plagioclase, orthoclase, and quartz; strong flow foliation |
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Location
| Latitude | 47.2306 |
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| Longitude | -109.076 |
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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 | 62.82 | | WT% | XRF |
| AL2O3 | 18.04 | | WT% | XRF |
| TIO2 | 0.43 | | WT% | XRF |
| FEOT | 2.68 | | WT% | XRF |
| MNO | 0.18 | | WT% | XRF |
| CAO | 4.25 | | WT% | XRF |
| MGO | 0.79 | | WT% | XRF |
| K2O | 3.89 | | WT% | XRF |
| NA2O | 4.79 | | WT% | XRF |
| P2O5 | 0.13 | | WT% | XRF |
| TOTAL | 98 | | WT% | XRF |
| RB | 111 | | PPM | XRF |
| SR | 645 | | PPM | XRF |
