Isselhardt, C.F., Matlick, J.S., Parmentier, P.P., and Bamford, R.W., 1983, Temperature gradient hole results from Makushin geothermal area, Unalaska Island, Alaska: Geothermal Resources Council, Transactions v. 7, p. 95-98.
Following geological, geophysical, and geochemical surveys of the Hakushin geothermal area, three 1,500+/-foot temperature gradient holes (TGH) were sited and drilled. TGH D-1 penetrated andesites and diorite, locally hydrothermally altered, and yielded both convective and conductive thermal profiles. TGH E-1 and TGH 1-1 both encountered diorite only. TGH E-1 exhibited high temperatures (195°C) and corresponding geochemical indicia. TGH 1-1 was cool (-8O"C), but showed geochemistry indicative of a paleo-geothermal environment. The high thermal gradients (145°C to 692OC/ban) , temperatures (195°C) , and geochemistry provide strong evidence for the existence of a shallow, high temperature geothermal system.
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