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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Serpentine Hot Springs Temp. 75oC / 167oF 60oC / 140oF Flow (LPM) 520 137 GPM TDS SiO2 geothermometer 3290 137.10 oC 2472.7 130.8 oC Giggenbach geothermometer 119.0 oC 111.4 oC Serpentine hot springs, located approximately 60 miles west of Deering in the Bering Land Bridge National Preserve, is the hottest of all the springs in the CAHSB. It is also anomalously saline relative to other CAHSB springs, containing elevated concentrations of total dissolved solids (TDS), mostly Cl, Na, Ca, K, Li , Br, and B (Miller, 1973). The hot springs issue out of the Serpentine Hot Springs granite, which is actually a composite body of several different granites emplaced at different times. The composite body is cut by several sets of steep faults. An intricate network of faults southeast of the granite is associated with major geochemical anomalies and mineralized areas lying along a NW-trending fault zone (Sainsbury and others, 1980). The Serpentine hot springs granite contains small amounts of radioactive material disseminated throughout; however not in large enough quantities to be commercially interesting (Moxham and West, 1953). Based on temperature data alone, these springs appear be suitable for Chena-type power generation, though the salinity of the fluids could be an issue in terms of scaling in wells and pipes. Lava Creek Hot Springs Temp. 53oC / 127oF 50oC / 122oF Flow (LPM) TDS 360 330 360 295.5 SiO2 geothermometer 118.2 oC - Giggenbach geothermometer 96.6 oC - Lava Creek Hot Springs is located approximately 50 miles south of Deering and 70 miles southwest of Buckland. The hot springs are about 15 miles south of the Lost Jim lava flow and the Imuruk Lake volcanic field, some of the youngest lava flows in western Alaska. The Imuruk Lake volcanic field is a vast geologic feature consisting of flows and ~75 vents (cones) that covers nearly 2,300 km2 of area. The largest and most recent cone is the Lost Jim vent, which erupted 1,655 years ago; but the bulk of the volcanic deposits are much older (5.7 to 2.2 million years old). This suggests that this part of the Seward Peninsula may still be a volcanically “active” region. The hot spring, however, issues from within granitic rocks of the Bendeleben Mountains, not the volcanic deposits. It is so named because the spring is located approximately 3 miles from the probable source area for the basalt that flowed down Lava Creek in the Bendeleben Mountains (Miller and others, 1973). The Imuruk Lake area lies in a poorly defined graben (Hopkins, 1959) with giant scarps as high as 30 m and as long as 5 km (Wood and Kienle, 1990). Several faults in the Bendeleben mountains continue this trend, but it is not clear whether the Lava creek hot springs are situated on or near such faults. The hot springs are also about 10 miles northeast of the Death Valley / Boulder Creek uranium deposit, which follows a northwest-trending linear strike. If the geothermometer predictions are correct and hotter fluid exists at depth, then depending on the depth of the reservoir these springs could be suitable for Chena-type power generation. One concern is that the flow rate is somewhat low so substantial pumping may be required. 4

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