气候变化领域集成服务门户(CCPortal): Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection

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DOI	10.3389/feart.2021.786051
	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
	Tian, Jiao; Li, Yiman; Zhou, Xiaocheng; Pang, Zhonghe; Li, Liwu; Xing, Lantian; Li, Zhongping
通讯作者	Zhou, XC (通讯作者)，China Earthquake Adm, Inst Earthquake Forecasting, Beijing, Peoples R China.
发表日期	2021
EISSN	2296-6463
卷号	9
英文摘要	Hot springs and igneous rocks are present widely in southeast China, influenced by the subduction of the Western Pacific and Philippine Sea Plates. This study reports on new data of chemical compositions and He-Ne-C isotopes for gas samples from representative hot springs and wells in the Guangdong and Fujian provinces to identify the origin of hydrothermal volatiles and provide insight into geothermal tectonic affinities. The primary hydrothermal volatile component from southeast China is atmospheric N2, with a volumetric percentage of 82.19%-98.29%. It indicates medium-low temperature geothermal systems where geothermal fluids suffered a shallow circulation in closed fracture systems. Low CO2 and CH4 contents and their depleted delta 13C values confirmed the small number of deep-derived components in the study area. However, spatially discernible geochemical characteristics imply enhanced hydrothermal fluid convection in the adjacent area of the two provinces, including the Fengshun, Zhangzhou, Longyan, and Sanming geothermal fields. Specifically, the He-Ne isotopes from this area exhibit mantle He contribution of more than 10% and mantle heat flow accounts for more than half of the total heat flow. Moreover, according to the thermal background calculations, the highest heat flow value of 77.7 mW/m(2) is indicated for the Zhangzhou geothermal area and the lowest value of 54.7 mW/m(2) is indicated for the Maoming geothermal area. Given the epicenter distributions and the corresponding earthquake magnitudes, the NE-trending faults are heat-control tectonic structures and their intersections with the NW-trending faults provided expedite channels for geothermal fluids rising to the surface. Therefore, the preferred development potential of geothermal resources can be expected in the adjacent area of the two provinces where two sets of active faults crossed. This study provides critical information on understanding the geothermal distribution controlled by the tectonic structure in southeast China.
关键词	TENGCHONG VOLCANIC FIELD ISOTOPIC COMPOSITION FLUID GEOCHEMISTRY GEOTHERMAL SYSTEMS GAS GEOCHEMISTRY HELIUM-ISOTOPES FAULT ZONE FLOW SUBDUCTION ORIGIN
英文关键词	Southeast China; geothermal gas; heat-control structure; thermal background; hot springs
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000731678200001
来源期刊	FRONTIERS IN EARTH SCIENCE
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254339
作者单位	[Tian, Jiao; Zhou, Xiaocheng] China Earthquake Adm, Inst Earthquake Forecasting, Beijing, Peoples R China; [Tian, Jiao; Li, Yiman; Pang, Zhonghe] Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China; [Tian, Jiao; Li, Yiman; Pang, Zhonghe] Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geol Engn, Beijing, Peoples R China; [Li, Liwu; Xing, Lantian; Li, Zhongping] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Key Lab Petr Resources Res, Lanzhou, Peoples R China
推荐引用方式 GB/T 7714	Tian, Jiao,Li, Yiman,Zhou, Xiaocheng,et al. Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection[J]. 中国科学院西北生态环境资源研究院,2021,9.
APA	Tian, Jiao.,Li, Yiman.,Zhou, Xiaocheng.,Pang, Zhonghe.,Li, Liwu.,...&Li, Zhongping.(2021).Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection.FRONTIERS IN EARTH SCIENCE,9.
MLA	Tian, Jiao,et al."Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection".FRONTIERS IN EARTH SCIENCE 9(2021).