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more prospective than the northern half for geothermal resources. This is because the southern half is closer to known hot springs, and also because it is geologically more favorable for the development of hydrothermal systems. Most of this region is covered by geologic maps at relatively coarse scales (1:250,000 or greater), so detailed information is limited with the exception of a few areas of geologic significance. The southern NANA region encompasses three distinct geological provinces: the Seward Peninsula, the Yukon-Koyukuk uplands, and the Selawik & Kotzebue Basins (Fig. 2). Identifying geologic provinces is crucial because heat flow trends tend to be constant over geologic provinces (Blackwell, 1971). Figure 2. Rough outline of geologic provinces in southern NANA lands. Map from NANA website (http://www.nana.com/the%20land/regional_map.htm) Since almost all of the hot springs in the NANA region occur in or near plutonic rocks, it appears that the intersection of granitic plutons and faults is an environment conducive to the formation of hydrothermal systems. Many of the hot springs occur on or near mapped faults (Fig. 3), at pluton margins; or if it is a composite pluton, at the contact between different plutonic phases (see Sainsbury and others, 1980; and Kolker and others, 2007). Moreover, many of these plutons contain anomalous concentrations of the radioactive elements uranium and thorium, which is also true for other CAHSB-related plutons. A large part of western Alaska has been is considered a uranium-thorium metallogenic province chiefly because of the occurrence of uraniferous plutonic rocks with local concentrations of uranium minerals (Miller, 1976). It should be noted that granite bodies without well-developed fractures (such as the Selawik Hills pluton) do not appear to host hot springs, probably due to a low fracture permeability (Miller, 1973). Hence, it appears that the host granite must be well-fractured – that is, have sufficient permeability – to allow deep circulation of meteoric water (local snowmelt and rainwater). Selawik & Kotzebue Basins province Y ukon- Koyukuk province Seward Peninsula province 8PDF Image | US Department of Energy Tribal Energy Program
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