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  2. 地质与地球物理研究所
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  4. 岩石圈演化国家重点实验室
Behavior of barium isotopes during high-pressure metamorphism and fluid evolution

文献类型：期刊论文

作者Gu, Xiao-Feng2; Guo, Shun1; Yu, Hui-Min2,3; Xu, Juan2; Huang, Fang2,3
刊名EARTH AND PLANETARY SCIENCE LETTERS
出版日期2021-12-01
卷号575页码:10
关键词barium isotopes metamorphic vein subduction-zone fluid eclogites Dabie orogen
ISSN号0012-821X
DOI10.1016/j.epsl.2021.117176
英文摘要Barium (Ba) and its stable isotopes are powerful geochemical tracers for the recycling of subducted materials into the convective mantle. However, this requires a good understanding of the behavior of Ba isotopes during subduction-zone fluid processes. Here we present the first integrated study on Ba isotopes for two eclogite-vein systems (Ganghe and Hualiangting) that formed at high-pressure (HP) and ultrahigh-pressure (UHP) metamorphic conditions from the Dabie orogen, central China. The Ganghe system displays constant delta Ba-138/134 (-0.01 parts per thousand to 0.03 parts per thousand) in the UHP eclogites but relatively high delta Ba-138/134 (0.17 parts per thousand) in the HP vein. In contrast, in the Hualiangting system, delta Ba-138/134 of the UHP eclogites vary from -0.14 parts per thousand to 0.05 parts per thousand, while delta Ba-138/134 of the multiple HP veins and the retrograded amphibolites range from -0.17 parts per thousand to 0.34 parts per thousand and from -0.11 parts per thousand to 0.46 parts per thousand, respectively. The combined results suggest that Ba isotopes can be considerably fractionated during subduction-zone fluid processes. HP-UHP metamorphic dehydration of the eclogites during the early stages of exhumation can produce an isotopically heavy initial vein-forming fluid due to the preferential leaching of epidote enriched with heavy Ba isotopes from the host eclogites. However, such processes have limited effects on the bulk eclogites because the Ba-rich phengite exists as a residual phase. During vein formation, light Ba isotopes are preferentially enriched in minerals relative to the fluids, resulting in the residual fluids with high delta Ba-138/134. In addition, the fluids released from the gneisses have negative delta Ba-138/134 which is different from the eclogites, indicating that Ba isotopes can be used to trace the source of the metasomatic fluids. This study demonstrates that the UHP metamorphic rocks and HP veins can record Ba isotope fractionation during subduction-zone metamorphism and fluid-rock interaction, and recycling of the metamorphic rocks could modify Ba isotopic composition of the mantle wedge and arc volcanics. (C) 2021 Elsevier B.V. All rights reserved.
WOS关键词TRACE-ELEMENT ; ECLOGITE-FACIES ; DABIE TERRANE ; SUBDUCTION ZONES ; ROCK INTERACTION ; CENTRAL CHINA ; WESTERN ALPS ; FLOW ; VEINS ; CONSTRAINTS
资助项目National Key R&D Program of China[2018YFA0702600] ; National Science Foundation of China[41503002] ; National Science Foundation of China[41630206] ; National Science Foundation of China[41922013] ; National Basic Research Program of China[2015CB856104] ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration[D020202] ; Youth Innovation Promotion Association CAS[2017090]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000701642300002
出版者ELSEVIER
资助机构National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key R&D Program of China ; National Key R&D Program of China ; National Science Foundation of China ; National Science Foundation of China ; National Basic Research Program of China ; National Basic Research Program of China ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Fundamental Research Funds for the Central Universities, Preresearch Project on Civil Aerospace Technologies - Chinese National Space Administration ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/102749]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Gu, Xiao-Feng; Huang, Fang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, POB 9825, Beijing 100029, Peoples R China
2.Univ Sci & Technol China, Sch Earth & Space Sci, CAS Key Lab Crust Mantle Mat & Environm, Hefei 230026, Peoples R China
3.Univ Sci & Technol China, CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
推荐引用方式
GB/T 7714		 Gu, Xiao-Feng,Guo, Shun,Yu, Hui-Min,et al. Behavior of barium isotopes during high-pressure metamorphism and fluid evolution[J]. EARTH AND PLANETARY SCIENCE LETTERS,2021,575:10.
APA Gu, Xiao-Feng,Guo, Shun,Yu, Hui-Min,Xu, Juan,&Huang, Fang.(2021).Behavior of barium isotopes during high-pressure metamorphism and fluid evolution.EARTH AND PLANETARY SCIENCE LETTERS,575,10.
MLA Gu, Xiao-Feng,et al."Behavior of barium isotopes during high-pressure metamorphism and fluid evolution".EARTH AND PLANETARY SCIENCE LETTERS 575(2021):10.

入库方式： OAI收割

来源：地质与地球物理研究所

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