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Sample: 96-ARh-10

Sample ID: 96-ARh-10 [1] [2]
Station ID: 96-ARh-10
AT Num:
Volcano: Akutan
Possible source:
Eruption:
Collector: Richter, D. H.
Date sampled: 1996-00-00
Sample type 1: Other
Color:
Final unit: QTg
Text Description: QTg - Intrusive rocks (Holocene (?), Pleistocene and Pliocene). Gabbro. Small pluton of fine-to-medium-grained equigranular gabbro (51.7% SiO2) intrusive into subaqueous volcanic rocks (QTv) in Hot Springs Bay. Pluton is highly fractured and hydrothermally altered; disseminated pyrite is locally abundant. Rock consists of plagioclase (75-90%) and interstitial clinopyroxene (10%) and olivine? (5%).
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.