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• W2181297690 abstract "Results of geochemical and isotopic investigations in the Hengill geothermal area are presented. The area can be regarded as typical of Icelandic high temperature areas. It is mainly composed of pillow lavas and hyaloclastites, which were piled up during sub-glacial eruptions. Part of the area is traversed by a very active NESW trending fracture zone about 5 km broad, within which there are several eruptive fissures of postglacial age. The volcanic rocks are basalts of various kinds, but minor occurrences of intermediate and rhyolitic rocks have also been recorded. The study was based on chemical and isotopic analyses of fluid samples from Nesjavellir prior to production, and data collected in the years 2000-2007 from the productive geothermal fields. In addition, fluid samples were collected from the Nesjavellir and Hellisheidi fields during this study. These samples were analysed for chemical constituents and stable isotopes at the Institute of Earth Sciences, University of Iceland. The results indicate that the Nesjavellir and Hellisheidi thermal fluids do not share the same origin. In Nesjavellir the water comes from a distant source, the glacier Langjokull, whereas in Hellisheidi the water is of a more local origin. The isotopic composition of the thermal waters in Hellisheidi and Hveragerdi is very similar. According to the deuterium isotope values, fluids from well HE-1 in Hellisheidi (Kolvidarholl-1) are closer in origin to the Nesjavellir thermal fluid than the fluids circulating the Hellisheidi system. It is suggested that the Hellisheidi system is younger than the Nesjavellir system, both by stable isotope and chemical composition of the thermal fluids (Cl-SO4-HCO3 plot). In Nesjavellir the fluid is richer in 18 O and chemically more mature than in Hellisheidi, due to more intense water-rock interaction. An increase is observed in chloride and enthalpy in both the Nesjavellir and Hellisheidi fields due to increased utilisation. There is a pressure drop in both fields which causes boiling of the liquid phase which results in cooling, and hence a positive temperature gradient is created between the aquifer rock and the flowing fluid. Evidence of boiling is supported in both Nesjavellir and Hellisheidi by high CO2 values." @default.
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• W2181297690 date "2007-01-01" @default.
• W2181297690 modified "2023-09-27" @default.
• W2181297690 title "THE ISOTOPIC AND CHEMICAL CHARACTERISTICS OF GEOTHERMAL FLUIDS IN HENGILL AREA, SW-ICELAND: HELLISHEIDI, HVERAGERDI AND NESJAVELLIR FIELDS" @default.
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