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Duncan Canal volcano

Volcanic field 15 m / 49 ft
United States, Eastern Alaska, 56.5°N / -133.1°W
Current status: dormant (1 out of 5)
Duncan Canal volcano books
Typical eruption style: unspecified
Duncan Canal volcano eruptions: unknown, no recent eruptionsNo recent earthquakes
TimeMag. / DepthDistanceLocation

Background:

Conspicuous fresh-looking pahoehoe and aa lava flows overlie glacial till at Kupreanof Island in the central panhandle of SE Alaska. Quaternary basaltic lava flows of Holocene and/or Pleistocene age up to 10 m thick form several broad flat-lying peninsulas and scattered outcrops on the shores of Sumner Strait at the southern end of Kupreanof Island (Brew et al. 1985). On a peninsula in Kah Sheets Bay a basaltic flow depositionally overlies till of the youngest glaciation, and youthful-looking flows are exposed along a broad 12-km-wide front westward toward Douglas Bay. Two probable vents are found to the north within Mesozoic and Paleozoic rocks at the northern end of the Castle Islands in the Duncan Canal fault zone, and at Indian Point the flows contain inclusions of picrite. At High Castle Island, the basaltic flows are columnar-jointed and overlie planar to cross-bedded coarse sandstone and poorly sorted volcaniclastic conglomerate. Basaltic flows in the Duncan Canal area are both subaerial and submarine.
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Smithsonian / GVP volcano information


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