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Sample: 96-ARh-53D

Sample ID: 96-ARh-53D [1] [2]
Station ID: 96-ARh-53D
AT Num:
Volcano: Akutan
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1996-00-00
Sample type 1: Lava
Color: gray
Final unit: lcb
Text Description: Qcl - Cascade Bight lava flows. Thin (2-5 m) lava flows, exhibiting reddish scoriaceous tops and bottoms, dip away from summit breccia and plug area. Rocks are medium dark gray porphyritic basaltic andesites (55.1% SiO2) containing phenocrysts of plagioclase (10-15%, 3 mm), clinopyroxene (1-5%, 3 mm), orthopyroxene (1-3%, 1 mm), and olivine (1-3%, 3 mm) in a cryptocrystalline groundmass. Whole rock 40Ar/39Ar mean age of basaltic andesite is 0.15+/-0.05 Ma.
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.