Double Glacier Volcano,a ‘new’ Quaternary volcano in the eastern Aleutian volcanic arc |
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Authors: | Bruce L Reed Marvin A Lanphere Thomas P Miller |
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Institution: | (1) Branch of Alaska Geology, US Geological Survey, 4200 University Drive, 99508 Anchorage, Alaska, USA;(2) Branch of Isotope Geology, US Geological Survey, 345 Middlefield Road, 94025 Menlo Park, California, USA;(3) Alaska Volcano Observatory, US Geological Survey, 4200 University Drive, 99508 Anchorage, Alaska, USA |
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Abstract: | The Double Glacier Volcano (DGV) is a small dome complex of porphyritic hornblende andesite and dacite that is part of the Cook Inlet segment of Quaternary volcanoes of the eastern Aleutian arc. Its discovery reduces the previously described large volcano gap in Cook Inlet segment to a distance similar to that between other volcanoes in the area. DGV lavas are medium-K, calcalkaline andesites and dacites with concentrations of major and minor elements similar to the other Quaternary volcanoes of the Cook Inlet segment. Available K-Ar ages indicate that DGV was active 600–900 ka. |
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