Geochemical evidence for the nonexistence of supercritical geothermal fluids at the Yangbajing geothermal field, southern Tibet
نویسندگان
چکیده
Exploring and exploiting high-temperature (even supercritical) geothermal resources are significant to meet energy demands reduce carbon emissions. The Yangbajing field is the most exploited in China, with currently highest temperature (329.8 °C) measured a well. However, whether there supercritical fluids beneath deep parts of this under controversy. In paper, water isotope, chemical compositions, C–He isotopes gas samples were collected analyzed. originated from mixing meteoric magmatic (25%). sources CO2 dominated by thermogenic degassing carbonates metasediments crust while radioactive decay U Th granite source He. temperatures three different reservoirs 150 ± 15 °C, 250 10 ?320 °C (with depth ?8 km), respectively. These obtained using dissolved gas, soil flux, noble geothermometers. Unlike other fields worldwide larger, shallower, basaltic magma chambers, has deep-seated, small-scale, granitic chamber. Thus, its geological conditions not conducive for gestating fluids. results great significance exploring developing ultra-high-temperature) China.
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ژورنال
عنوان ژورنال: Journal of Hydrology
سال: 2022
ISSN: ['2589-9155']
DOI: https://doi.org/10.1016/j.jhydrol.2021.127243