Kanatak 47 mi (76 km) SW Karluk 53 mi (86 km) SE King Salmon 59 mi (94 km) NW Larsen Bay 67 mi (109 km) SE Anchorage 285 mi (459 km) NE
DESCRIPTION
From Hildreth and others (1999) [1]: "Alagogshak volcano, a newly recognized volcanic-front stratovolcano on the Alaska Peninsula rangecrest, 15 km southwest of Katmai Pass, produced 10-18 km3 of andesite-dacite eruptive products during several episodes of activity in the middle and late Pleistocene. From a central vent marked by hydrothermal alteration and remnants of a cratered fragmental cone on the present-day drainage divide, glacially incised stacks of lava flows (57-66 percent SiO,) dip radially and extend 6-10 km in most directions. Lava flows that make up four ridge-capping outliers well west of the volcano may also have erupted there. The medium-K calcalkaline Alagogshak eruptive suite is compositionally varied, probably reflecting independent evolution of different magma batches supplied in several episodes spread intermittently over at least 600,000 years."
REFERENCES CITED
[1]
Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park, 1999 Hildreth, W., Fierstein, J., Lanphere, M. A., and Siems, D. F., 1999, Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park: in Kelley, K.D. (ed.), Geologic studies in Alaska by the U.S. Geological Survey, 1997, U.S. Geological Survey Professional Paper PP 1614, p. 105-113. full-text PDF : 504 KB
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Hildreth, W., Fierstein, J., Lanphere, M. A., and Siems, D. F., 1999, Alagogshak volcano: A Pleistocene andesite-dacite stratovolcano in Katmai National Park: in Kelley, K.D. (ed.), Geologic studies in Alaska by the U.S. Geological Survey, 1997, U.S. Geological Survey Professional Paper PP 1614, p. 105-113.
