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Sample: 96-Mc-37C

Sample ID: 96-Mc-37C [1] [2]
Station ID: 96-Mc-37
AT Num:
Volcano: Akutan
Possible source:
Eruption:
Collector: McGimsey, R. G.
Date sampled: 1996-00-00
Sample type 1: Lava
Color: gray
Final unit: llp
Text Description: Hly - Lava Point younger lava flow. Massive flow, locally more than 20 m thick, with well-preserved blocky rubble surface. Rock is a medium dark gray, porphyritic andesite (56.8% SiO2) containing phenocrysts of plagioclase (10-15%, 3-4 mm), clinopyroxene (1-4%, 2 mm), and olivine (trace - 1%, 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.