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Sample: 96-Mc-34

Sample ID: 96-Mc-34 [1] [2]
Station ID: 96-Mc-34
AT Num:
Volcano: Akutan
Possible source:
Eruption:
Collector: McGimsey, R. G.
Date sampled: 1996-00-00
Sample type 1: Lava
Color: medium gray
Final unit: pap
Text Description: Qocp - older caldera wall rocks (Pleistocene). Plug. Massive intrusive exposed on Akutan Peak in wall of present caldera. Rock, collected from talus at foot of peak, is a medium gray, porphyritic basalt (51.1% SiO2, loc. 8, table 1) containing phenocrysts of plagioclase (15-30%, 4 mm), clinopyroxene (1-6%, 2 mm), and olivine (1-5%, 1 mm) in a cryptocrystalline 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.