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Sample: 96-ARh-59D

Sample ID: 96-ARh-59D [1] [2]
Station ID: 96-ARh-59
AT Num:
Volcano: Akutan
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1996-00-00
Sample type 1: Lava
Color:
Final unit: lbc
Text Description: Qocd - older caldera wall rocks (Pleistocene). Dome. Small dome or thick flow of banded, mixed magma, of porphyritic high-silica andesite. Dark bands (59.2% SiO2, loc. 9, table 1) are medium dark gray and consist of phenocrysts of plagioclase (5-10%, 2 mm), clinopyroxene (1-3%, 1.5 mm), and orthopyroxene (trace -1%, <1 mm) in a cryptofelsitic groundmass.
Sample Location:

References Cited

[1] Geology of Akutan Island, Alaska, 1998

Richter, D. H., Waythomas, C. F., McGimsey, R. G., and Stelling, P. L., 1998, Geology of Akutan Island, Alaska: U.S. Geological Survey Open-File Report 98-0135, 22 p., 1 sheet, scale 1:48,000.

[2] The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, Alaska, 2020

Coombs, M.L., and Jicha, B.R., 2020, The eruptive history, magmatic evolution, and influence of glacial ice at long-lived Akutan volcano, eastern Aleutian Islands, Alaska: GSA Bulletin, 29 p., https://doi.org/10.1130/B35667.1.