Geochemistry of geothermal fluids with implications on the sources of water and heat recharge to the Rekeng high-temperature geothermal system in the Eastern Himalayan Syntax

doi:10.1016/j.geothermics.2018.02.006

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院页岩气与地质工程重点实验室

	Geochemistry of geothermal fluids with implications on the sources of water and heat recharge to the Rekeng high-temperature geothermal system in the Eastern Himalayan Syntax
	Tian, Jiao 1,2,3; Pang, Zhonghe 1,2,3; Guo, Qi 1,4; Wang, Yingchun 1,2,3; Huang, Tianming1,2,3 ; Kong, Yanlong 1,2,3
刊名	GEOTHERMICS
	2018-07-01
卷号	74 页码:92-105
关键词	Eastern Himalayan syntax Hydrogeochemistry Geothermal gas Heat source Isotope Rekeng geothermal system
ISSN号	0375-6505
DOI	10.1016/j.geothermics.2018.02.006
文献子类	Article
英文摘要	Rekeng geothermal system in Eastern Himalayan syntax is found to exhibit the strongest surface manifestations in the western Sichuan plateau, with numerous boiling springs, fumeroles and geysers. What is the heat source of such a high temperature system? Is there a magmatic heat source to support it? In this study we have attempted to seek clues from the isotope geochemistry of geothermal fluids. The stable isotope delta H-2 and delta O-18 composition of geothermal water suggests that it is recharged by precipitation and snow melt of the surrounding mountains. The chemical type of the geothermal water is alkaline HCO3-Na as a result of water-CO2-rock interaction. Geothermal reservoir temperature in the fractured metamorphic rock is estimated to be between 200 degrees C-225 degrees C, using the chemical geothermometers and the chemical thermodynamic modeling approach. During the degassing process upon rising, 0.05 mol/L CO2 has escaped from the geothermal fluid. Evidence from the relationships among major ions and geothermal suite (Li, B, F, As) indicate that the hot springs shared the same parent source fluid and they mixed with cold groundwater to different levels in the subsidiary fractures near surface. Carbon isotope signatures show that the CO2 enriched geothermal gas is 95% of crustal metamorphic origin. Additionally, based on helium isotope analysis, the mantle magmatic He-3 signatures have been largely obliterated since it accounts for no more than 5%, implying there is no underlying mantle-derived magma chamber acting as heat source. Therefore, a significant portion of heat is likely converted from crustal deformation in view of the regional tectonic background as Eastern Himalayan syntax.
WOS关键词	NEW-ZEALAND ; HYDROTHERMAL SYSTEM ; GAS GEOCHEMISTRY ; TIBETAN PLATEAU ; CARBON ISOTOPES ; NOBLE-GASES ; CHINA ; EVOLUTION ; HELIUM ; FIELD
WOS研究方向	Energy & Fuels ; Geology
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000431469700008
资助机构	National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319) ; National Natural Science Foundation of China(41430319)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/88306]
专题	地质与地球物理研究所_中国科学院页岩气与地质工程重点实验室
通讯作者	Pang, Zhonghe
作者单位	1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China 2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100029, Peoples R China 4.China Minmet Corp, Beijing 10010, Peoples R China
推荐引用方式 GB/T 7714	Tian, Jiao,Pang, Zhonghe,Guo, Qi,et al. Geochemistry of geothermal fluids with implications on the sources of water and heat recharge to the Rekeng high-temperature geothermal system in the Eastern Himalayan Syntax[J]. GEOTHERMICS,2018,74:92-105.
APA	Tian, Jiao,Pang, Zhonghe,Guo, Qi,Wang, Yingchun,Huang, Tianming,&Kong, Yanlong.(2018).Geochemistry of geothermal fluids with implications on the sources of water and heat recharge to the Rekeng high-temperature geothermal system in the Eastern Himalayan Syntax.GEOTHERMICS,74,92-105.
MLA	Tian, Jiao,et al."Geochemistry of geothermal fluids with implications on the sources of water and heat recharge to the Rekeng high-temperature geothermal system in the Eastern Himalayan Syntax".GEOTHERMICS 74(2018):92-105.