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Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China

文献类型：期刊论文

作者Zhao, Tong1,2; Liu, Wenjing1,2,3; Xu, Zhifang1,2,3
刊名GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS
出版日期2022-04-01
卷号23期号:4页码:11
关键词magnesium isotopes silicate weathering clay formation isotope fractionation Mg cycle
DOI10.1029/2021GC010100
英文摘要Mg isotopic composition of river water is dominantly controlled by the dissolution of both silicate and carbonate sources and a series of biogeochemical processes. However, the relative importance of source and isotopic fractionation control at basin/global scale is poorly constrained. This study presents the Mg isotopic composition of river water and suspended load in river draining silicate rocks in the southeastern coastal region of China. The fractionation effect of silicate weathering on Mg isotopes is documented in both dissolved and solid phases. Mg isotopic composition of rivers draining silicate rocks exhibit similar to 0.3 parts per thousand delta Mg-26 difference, the release of Mg from Mg-rich minerals and formation of clays are the dominant processes controlling Mg isotopic composition of river water. The variation of Mg isotopic compositions of suspended load is closely related to the species of secondary clays (illite and chlorite); the fractionation direction during illite and chlorite formation contrasts, isotopically heavy Mg preferentially incorporates into illite while light Mg incorporates into chlorite. Furthermore, the negative correlation between 1/Mg and Mg isotopic compositions of river water indicates the Mg re-distribution and isotope fractionation between weathering solutions and secondary clays during silicate weathering. Such isotope fractionation-induced Mg isotope variations could be employed to estimate the contribution of Mg from silicate weathering at basin/continental scale.
WOS关键词CO2 CONSUMPTION ; WATER GEOCHEMISTRY ; MACKENZIE BASIN ; SEAWATER MG ; BEHAVIOR ; CARBONATE ; PLATEAU ; RATES ; PRECIPITATION ; SYSTEMATICS
资助项目National Key Research and Development Program of China[2020YFA0607700] ; "Strategic Priority Research Program" of the Chinese Academy of Sciences[XDB26000000] ; National Natural Science Foundation of China[91747202] ; National Natural Science Foundation of China[41730857] ; National Natural Science Foundation of China[42003015] ; Youth Innovation Promotion Association CAS[2019067]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000783759300001
出版者AMER GEOPHYSICAL UNION
资助机构National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Key Research and Development Program of China ; National Key Research and Development Program of China ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; "Strategic Priority Research Program" of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/105131]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Liu, Wenjing
作者单位1.Chinese Acad Sci, Key Lab Cenozo Geol & Environm, Inst Geol & Geophys, Beijing, Peoples R China
2.Chinese Acad Sci, Innovat Acad Earth Sci, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Zhao, Tong,Liu, Wenjing,Xu, Zhifang. Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China[J]. GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,2022,23(4):11.
APA Zhao, Tong,Liu, Wenjing,&Xu, Zhifang.(2022).Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China.GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS,23(4),11.
MLA Zhao, Tong,et al."Magnesium Isotope Fractionation During Silicate Weathering: Constrains From Riverine Mg Isotopic Composition in the Southeastern Coastal Region of China".GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS 23.4(2022):11.

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来源：地质与地球物理研究所

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