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| بین المللی علوم (منتشر نمی شود) | ||
| مقاله 5، دوره 5، شماره 0 - شماره پیاپی 1371، اردیبهشت 1383 اصل مقاله (986.88 K) | ||
| نویسنده | ||
| Fereydoun Ghazban* | ||
| عنوان مقاله [English] | ||
| - | ||
| چکیده [English] | ||
| Geologic and geochemical investigation in Mount Taftan indicates a viable geothermal resource probably centered and upflowing beneath the volcano. This volcanic region in SE Iran has a very high potential for generation of geothermal energy. The presence of volcanos is intimately related to the subduction of Neotethys oceanic lithosphere under the Central Iranian continental plate. Magmatism in Mt. Taftan is represented by subalkaline volcanics that vary from basaltic through andesitic to dacitic composition. Springs with temperatures ranging from 10 to 35 °C are located in the prospect area, fed by the sedimentary aquifers. Based on geochemical and hydrological data, the thermal Cl-Ca-SO4 waters rise toward the surface from reservoirs made up of a volcano-sedimentary sequence through faults and fractures. Fumerolic and thermal discharges from this volcanic region contain deeply derived H2S with subsequent oxidation to SO4 -2 in the system. Based on Na-K-Mg ternary diagram, none of the discharge waters could be representative of deep fluids in “full equilibrium” with the reservoir rocks. The acid alteration in the shallow parts of Mt. Taftan results from the oxidation of H2S. Steam, accompanied by H2S rises from depth and produces acid sulfate fluids, which react with the surficial rocks to generate alteration mineral assemblages. The temperature range established from alteration mineralogy, overlaps with that determined from chemical geothermometers. The occurrence of hydrothermal alteration minerals at the surface indicates a low to moderate geothermal system. Clay mineral alteration assemblage encountered in Taftan geothermal system might have been superimposed on older and higher-temperature stages. The geothermal energy produced in the system is from the cooling magma, which is heating circulating groundwater. The magma-heated water, which emerges at the surface as fumerolic discharges and heats up the descending cold meteoric water, signals the presence of the shallow heat source beneath Mt. Taftan | ||
| کلیدواژه‌ها [English] | ||
| Alteration, Geochemistry, Geothermal, Geothermometry, Iran, MountTaftan | ||
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