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Sample VHNE-168N
NavDat sample number 5519 · MONZONITE
Sample
| Sample ID | VHNE-168N |
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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 | porphyritic granodiorite-quartz monzonite, Locally called quartz monzonite or monzonite. Light-gray to pale-flesh-colored porphyritic intrusive rock composed of 36-37 percent plagioclase An35-40, 7-10 percent potassium feldspar, 4-5 percent quartz, 2-3 percent biotite, as much as 1 percent hornblend and 1-1.5 percent magnetite phenocrysts in an aplitic groundmass 0.03-mm grain size composed of 13-15 percent plagioclase, 15-18 percent potassium feldspar, 15-16 percent quartz, and about 1 percent combined biotite, hornblende, and magnetite. Accessory minerals are apatite 0.2 percent of rock, sphene 0.2 percent of rock, and zircon trace. |
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Location
| Latitude | 32.3978 |
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| Longitude | -111.53 |
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| Location | Pima County |
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| State / province | Arizona |
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Age
| Age (Ma) | Error | Min | Max | Geologic age | Dated by |
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| 59.8 |
|
53.3 |
66.3 |
|
|
