Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection

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...

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Autores principales:	Jiao Tian, Yiman Li, Xiaocheng Zhou, Zhonghe Pang, Liwu Li, Lantian Xing, Zhongping Li
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	Southeast China geothermal gas heat-control structure thermal background hot springs Science Q
Acceso en línea:	https://doaj.org/article/603ecb863eb84708ad97280aeddf41f8
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spelling	oai:doaj.org-article:603ecb863eb84708ad97280aeddf41f82021-12-01T15:01:38ZGeochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection2296-646310.3389/feart.2021.786051https://doaj.org/article/603ecb863eb84708ad97280aeddf41f82021-11-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.786051/fullhttps://doaj.org/toc/2296-6463Hot 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 δ13C 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/m2 is indicated for the Zhangzhou geothermal area and the lowest value of 54.7 mW/m2 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.Jiao TianJiao TianJiao TianYiman LiYiman LiXiaocheng ZhouZhonghe PangZhonghe PangLiwu LiLantian XingZhongping LiFrontiers Media S.A.articleSoutheast Chinageothermal gasheat-control structurethermal backgroundhot springsScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Southeast China geothermal gas heat-control structure thermal background hot springs Science Q
spellingShingle	Southeast China geothermal gas heat-control structure thermal background hot springs Science Q Jiao Tian Jiao Tian Jiao Tian Yiman Li Yiman Li Xiaocheng Zhou Zhonghe Pang Zhonghe Pang Liwu Li Lantian Xing Zhongping Li Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
description	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 δ13C 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/m2 is indicated for the Zhangzhou geothermal area and the lowest value of 54.7 mW/m2 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.
format	article
author	Jiao Tian Jiao Tian Jiao Tian Yiman Li Yiman Li Xiaocheng Zhou Zhonghe Pang Zhonghe Pang Liwu Li Lantian Xing Zhongping Li
author_facet	Jiao Tian Jiao Tian Jiao Tian Yiman Li Yiman Li Xiaocheng Zhou Zhonghe Pang Zhonghe Pang Liwu Li Lantian Xing Zhongping Li
author_sort	Jiao Tian
title	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
title_short	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
title_full	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
title_fullStr	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
title_full_unstemmed	Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection
title_sort	geochemical characteristics of hydrothermal volatiles from southeast china and their implications on the tectonic structure controlling heat convection
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/603ecb863eb84708ad97280aeddf41f8
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Geochemical Characteristics of Hydrothermal Volatiles From Southeast China and Their Implications on the Tectonic Structure Controlling Heat Convection

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