Sample: 81AWs 269
| Sample ID: | 81AWs 269 [1] |
| Station ID: | 81AWs 269 |
| AT Num: | |
| Volcano: | Ugashik caldera |
| Possible source: | |
| Eruption: | |
| Collector: | Wilson, F. H. |
| Date sampled: | 1981-01-01 |
| Sample type 1: | Lava |
| Color: | pale-red |
| Final unit: | |
| Text Description: | Pale-red (5 R 6/2), vesicular, porphyritic dacite (S; high-silica andesite G) flow. Major minerals are plagioclase (oscillatory zoned An 60 to An 72, average near An 63), orthopyroxene (hypersthene?), and rare clinopyroxene. Plagioclase and pyroxene phenocrysts in a very fine grained glass and plagioclase groundmass. Mafic phenocrysts are smaller than plagioclase phenocrysts. |
| Sample Location: |
References Cited
[1] 2004 volcanic activity in Alaska and Kamchatka: summary of events and response of the Alaska Volcano Observatory, 2005
Neal, C.A., McGimsey, R.G., Dixon, Jim, and Melnikov, Dimitry, 2005, 2004 volcanic activity in Alaska and Kamchatka: summary of events and response of the Alaska Volcano Observatory: U.S. Geological Survey Open-File Report 2005-1308, 71 p., http://pubs.usgs.gov/of/2005/1308/.
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