Sample: 72-PCL-71
| Sample ID: | 72-PCL-71 [1] |
| Station ID: | 72-PCL-71 |
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| Eruption: | |
| Collector: | Lowe, P. C. |
| Date sampled: | 1972-00-00 |
| Sample type 1: | Lava |
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| Text Description: | Wrangell Lava. Rhyodacite domes and associated flows. Massive, usually gray rocks that weather pinkish gray to tan. Commonly porphyritic, with abundant phenocrysts of plagioclase (as much as 60% of rock), hypersthene, and minor oxyhornblende and altered biotite. Locally devitrified and altered to chlorite and clay minerals. K-Ar date on plagioclase from large dome in northeastern part of quadrangle (sec. 7 , T. 7 N., R. 13 E.) is 3.74 m.y. (M. Lanphere, written commun., 1977) |
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