O,H,and Sr isotope evidence for origin and mixing processes of the Gudui geothermal system,Himalayas,China

作     者：Chenguang Wang Mianping Zheng Xuefei Zhang Enyuan Xing Jiangyi Zhang Jianhong Ren Yuan Ling Chenguang Wang;Mianping Zheng;Xuefei Zhang;Enyuan Xing;Jiangyi Zhang;Jianhong Ren;Yuan Ling

作者机构：MLR Key Laboratory of Saline Lake Resources and EnvironmentsInstitute of Mineral ResourcesCAGSBeijing100037China Hydrochemistry and Environmental LaboratoryInstitute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China State Key Laboratory of Geological Processes and Mineral ResourcesChina University of Geoscience(Beijing)Beijing100083China 

出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)

年 卷 期：2020年第11卷第4期

页      面：1175-1187页

核心收录：

学科分类：070902[理学-地球化学] 070801[理学-固体地球物理学] 0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 

基　　金：This work was financially supported by the China Geological Survey(Grant No.DD20160054) the National Natural Science Foundation of China(Grant No.U1407207) the National Key Research and Development Program of China(Grant No.2017YFC0602802) 

主　　题：Geothermal fluid Oxygen-18 and deuterium isotope 87Sr/86Sr ratio Origin and mixing Gudui Himalayas 

摘      要：Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China s *** about 150 km southeast of Lhasa City,the capital of Tibet,the Gudui geothermal field belongs to the Sangri-Cuona rift belt,also known as the Sangri-Cuona geothermal belt,and is representative of the non-volcanic geothermal systems in the *** this study,oxygen-18 and deuterium isotope compositions as well as 87Sr/86Sr ratios of water samples collected from the Gudui geothermal field were characterized to understand the origin and mixing processes of the geothermal fluids at *** and oxygen isotope plots show both,deep and shallow reservoirs in the Gudui geothermal *** geothermal fluids are the mixing product of magmatic and infiltrating snow-melt *** show that the magma fluid component of the deep geothermal fluids account for about 21.10%-24.04%;magma fluids lay also be a contributing source of *** linear relationship of the 87Sr/86Sr isotopic ratio versus the 1/Sr plot indicates that shallow geothermal fluids form from the mixing of deep geothermal fluids with cold *** a binary mixing model with deep geothermal fluid and cold groundwater as two end-members,the nixing ratios of the latter in most surface hot springs samples were calculated to be between 5% and 10%.Combined with basic geological characteristics,hydrogen and oxygen isotope characteristics,strontium concentration,87Sr/(86)Sr ratios,and the binary mixing model,we infer the 6 th-Class Reservoirs Evolution Conceptual Model(6-CRECM) for the Gudui geothermal *** model represents an idealized summary of the characteristics of the Gudui geothermal field based on our comprehensive understanding of the origin and mixing processes of the geothermal fluid in *** study may aid in identifying the geothermal and geochemical origin of the Gudui high-temperature hydrothermal systems in r