Temperature Gradient Hole Results from Makushin Geothermal Area, Unalaska Island, Alaska
- Key words
- Exploration; USA; Alaska; Unalaska; Temperature Gradient; Logs
- Location
- Makushin Volcano, Alaska; Unalaska, Alaska
- Conference
- Geothermal Resources Council Transactions
- Year
- 1983
- Session
- Exploration; Core sampling; Temperature gradients; Mineralog
- Language
- English
Abstract
Following geological, geophysical and geochemical surveys of the Makushin geothermal area, there 15,00 foot temperature gradient holes (TGH) were sited and drilled. TGH D-1 penetrated adnesites and diorite, locally hydrothermally altered, and yielded both convective and conductive thermal profiles. TGH E-1 exhibited high temperatures (195°C) and corresponding geochemical indicia. TGH I-1 was cool (-80°C) but showed geochemistry indicative of a paleogoethermal environment. The high thermal gradients (145°C to 692°C/km) temperatures (195°C), and geochemistry provide strong evidence for the existence of a shallow, high temperature geothermal system.
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