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(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) The Seward Peninsula geologic province is characterized predominantly by metamorphic rocks of Paleozoic age that are locally intruded by several plutons of Cretaceous and Tertiary age. Quaternary volcanic rocks (basalt) cover large parts of the north-central part of the Peninsula, such as the Imuruk Lake volcanic field (Fig. 4). Parts of the Peninsula may be undergoing incipient crustal rifting (Turner and Swanson, 1981), which suggests that magma could be present at relatively shallow depths beneath the Peninsula. Such an explanation could account for the hot springs on the Seward Peninsula; however all the springs are clustered around granitic intrusions, not volcanic rocks. Hence, like the rest of the CAHSB hot springs, the heat source remains ambiguous. This geologic province could very likely be a high heat flow province, but there is insufficient data at this time to know for certain. Hot springs in this province include Lava Creek and Serpentine, and several others outside of the NANA region. The Yukon-Koyukuk province is a large tract of volcanic and volcanic- sedimentary rocks intruded by an east-west belt of Tertiary and Cretaceous granitic rocks. All of the hot springs are associated with the granitic intrusions. Quaternary basalt covers several hundred square miles in the western part of the province, also called the Koyuk- Buckland volcanic field (Fig. 3. The volcanic field contains large maars and 5 small shield-shaped volcanoes. The age of the basalts is unknown, but they are thought to be correlative with the Imuruk basalt field 100 km to the west (Wood and Kienle, 1990). The western part of the Yukon-Koyukuk province could be a high heat flow province, but Selawik & Kotzebue Basins province Y ukon- Koyukuk province Seward Peninsula province 7PDF Image | NANA Geothermal Assessment Project (GAP) Results
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