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NANA Geothermal Assessment Project (GAP) Results

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NANA Geothermal Assessment Project (GAP) Results ( nana-geothermal-assessment-project-gap-results )

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more information is necessary to know for certain. Hot Springs in this province include Granite Mountain, Divison, Hawk, South, and several other hot springs outside of the NANA region. Figure 3. Volcanic fields in NW Alaska. Source: Alaska Volcano Observatory The Selawik and Kotzebue Basins are geologically distinct from the Seward Peninsula and the Yukon-Koyukuk provinces. Because it is a sedimentary and tectonic basin, this geologic province is probably a low or moderate heat flow province. Again, more information is necessary to know this for certain. There are no hot springs associated with this geologic province. Like the Hope basin to the west, these basins are large downdropped sections of the crust that have filled in with thousands of feet of sediments. The Selawik Basin should be considered the onshore extension of the Hope and Kotzebue Basins. The two deep wells that have been drilled into this province (at Cape Espenburg and at Nimiuk Point, 17 miles south of Kotzebue) confirm the sedimentary basin nature of this province: the wells encountered 4700 and 5000 feet of sedimentary rock, respectively. Beneath the sedimentary units are small beds of volcanic rocks, probably contiguous with the volcanic rocks that outcrop on the Seward Peninsula. There are several maars on the northwest Seward Peninsula. The Espenburg Maars is one of the larges maars on earth. They were formed by a series of Pleistocene basaltic eruptions through thick permafrost (Hopkins and others, 1996). Though these maars are located on the Seward Peninsula, geologically they appear to be part of the Selawik- Kotzebue Basin province. Hence, the Selawik-Kotzebue Basin province may be volcanically active as well. Many of the hot springs in the NANA region occur on or near mapped faults (Fig. 4). Since almost all of the hot springs 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. 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). Hence, 8

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