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学科主题: Geosciences, Multidisciplinary
题名: Geochemistry of geopressured hydrothermal waters in the Niigata Sedimentary Basin, Japan
作者: Xu, HL ; Shen, JW ; Zhou, XW
关键词: expulsion activity ; geopressured hydrothermal system ; geothermal water ; isotope chemistry ; Niigata Sedimentary Basin
刊名: ISLAND ARC
发表日期: 2006
卷: 15, 期:1, 页:199-209
收录类别: sci
部门归属: Chinese Acad Sci, S China Sea Inst Oceanol, Guangzhou 510301, Guangdong, Peoples R China; China Univ Geosci, Fac Earth Resources, Wuhan 430074, Peoples R China
项目归属: 海洋地质
摘要: 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 delta D and delta O-18 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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WOS记录号: WOS:000235841300016
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4428
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Xu, HL; Shen, JW; Zhou, XW.Geochemistry of geopressured hydrothermal waters in the Niigata Sedimentary Basin, Japan,ISLAND ARC,2006,15(1):199-209
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