Geochemistry of geopressured hydrothermal waters in the Niigata Sedimentary Basin, Japan |
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| Authors: | Hui-Long Xu Jian-Wei Shen Xue-Wu Zhou |
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| Institution: | South China Sea Institute of Oceanology, Chinese Academy of Sciences, 164 West Xingang Road, Guangzhou 510301, China (email: ) and;Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Abstract Geothermal waters in the Niigata Sedimentary Basin, central Japan, are divided into four groups based on their chemical composition (i.e. Na-SO4-type, Na-SO4-Cl-type, Na-Cl-type and Na-Cl-HCO3-type). The Na-SO4-type geothermal water forms as a consequence of water–rock interaction and generally occurs in the outer part of the basin. The Na-Cl-type geothermal water is further subdivided into the original Na-Cl-type geopressured thermal water and the mixed Na-Cl-type geothermal water, in terms of its geochemical and isotopic composition. The original Na-Cl-type geopressured thermal water originates from a geopressured hydrothermal system containing the altered fossil formation waters that are sealed at depth. It moves up to the upper part of the depositional succession or the ground, and generally does not mix with groundwater that is of meteoric origin. This type of water is cooled by heat conduction. The concentration of Cl– in this type of thermal water is very similar to that in seawater. The δD and δ18O values are approximately constant and independent of temperature. The original Na-Cl-type geopressured thermal water is distributed mainly along anticlinal axes in folded Neogene formations. The mixed Na-Cl-type geothermal water is related to the expulsion activity of the geopressured hydrothermal system and occurs mostly along active faults. It is formed by shallow groundwater of meteoric origin being mixed with geopressured hydrothermal water when the geopressured hydrothermal system was expulsed along active faults by paroxysmal tectonic events. |
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| Keywords: | expulsion activity geopressured hydrothermal system geothermal water isotope chemistry Niigata Sedimentary Basin |
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