Liss, S.A., and Motyka, R.J., 1994, Pilgrim Springs KGRA, Seward Peninsula, Alaska: Assessment of fluid geochemistry in restructuring the geothermal industry: Geothermal Resources Council, Transactions, v. 18, p. 213-219.
The Pilgrim Springs geothermal system is hosted by a fault-block sedimentary basin and consists of a shallow 90°C aquifer fed from deeper reservoirs with temperatures of at least 150°C. The deep aquifers are likely recharged by surface meteoric waters migrating along graben faults while river water infiltrating through creek bottoms appears to be diluting waters in the shallow reservoir. Thermal waters are slightly saline with chlorides and other constituents in part derived from interaction of heated meteoric waters with marine sediments that comprise the basin fill. Has chemistry, dominated by CH4 and N2, is consistent with sedimentary source for dissolved constituents. Geochemical and temperature gradients measured in drill holes indicates conduits feeding the shallow aquifer lie closest to Well PSI and the hot springs. Flowing wells have captured and diverted much of the ascending thermal water away from nearby springs, which have dropped dramatically in temperature and discharge.
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