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Sample: 81AWs 271

Sample ID: 81AWs 271 [1]
Station ID: 81AWs 271
AT Num:
Volcano: Ugashik caldera
Possible source:
Eruption:
Collector: Wilson, F. H.
Date sampled: 1981-01-01
Sample type 1: Lava
Color: light-gray
Final unit:
Text Description: Light-gray (N 7), vesicular biotite-plagioclase dacite porphyry. Major phases are biotite, quartz, hornblende, orthopyroxene, plagioclase (An 30*), and glass. Weakly developed flow foliation, numerous dark-gray (N 3) xenoliths in hand sample and thin section. Dome in post-glacial (?) Ugashik caldera.
Sample Location:

References Cited

[1] Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, Alaska, 1992

Wilson, F.H., and Shew, Nora, 1992, Map and tables showing geochronology and whole-rock geochemistry of selected samples, Ugashik and part of Karluk quadrangles, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1539-E, 34 p., 2 sheets, scale 1:250,000.