IGGCAS OpenIR  > 新生代地质与环境院重点实验室
The influence of carbonate precipitation on riverine magnesium isotope signals: New constrains from Jinsha River Basin, Southeast Tibetan Plateau
Zhao, Tong1,2,3; Liu, Wenjing1,2,3; Xu, Zhifang1,2,3; Sun, Huiguo1,2,3; Zhou, Xiaode1,2,3; Zhou, Li4; Zhang, Jiangyi1,2; Zhang, Xuan1,2,3; Jiang, Hao1,2,3; Liu, Taoze5
2019-03-01
Source PublicationGEOCHIMICA ET COSMOCHIMICA ACTA
ISSN0016-7037
Volume248Pages:172-184
AbstractMagnesium isotope behavior in dissolution and precipitation reactions during chemical weathering have been well documented. However, mechanisms of mineral dissolution and precipitation impact on the riverine Mg isotope composition under different climatic and geology background are not well constrained, which limits Mg isotope application in weathering research. Mg isotopic compositions for solute and suspended sediments in Jinsha River Basin, located in Tibetan Plateau, China, were examined to address this issue. The delta Mg-26 values for dissolved loads range from -1.67 parts per thousand to -0.5 parts per thousand, and the suspended loads show systematically heavier Mg isotope compositions (-1.15 parts per thousand to -0.06 parts per thousand). Conservative mixing between different rock weathering end-members fails to fully explain Mg isotopic composition variation of Jinsha River waters based on mass balance and mixing model with the river geochemistry data. Mg in rivers draining dominantly carbonate and evaporite is isotopically heavier compared with the value of catchment bedrocks, and water pH and delta Mg-26 values are negatively correlated in carbonate (calcite and dolomite) oversaturated river waters, which suggests the precipitation of secondary carbonate as an important mechanism driving the delta Mg-26 of dissolved loads heavier. For carbonate unsaturated waters, Mg concentrations and delta Mg-26 values are intermediate between those of silicate dominated basins and carbonate oversaturated waters. The results suggest two possible different mechanisms controlling river solute delta Mg-26 values: fractionation during carbonate precipitation incorporating of Mg; and conservative mixing between a solute end-member formed from carbonate precipitation and end-members from rock weathering. This study provides new evidence and insights in carbonate precipitation processes regulating river Mg isotope signature and its potential influence on Mg cycling. (C) 2019 Elsevier Ltd. All rights reserved.
KeywordRiver geochemistry Chemical weathering Mg isotopes Secondary carbonate precipitation
DOI10.1016/j.gca.2019.01.005
Funding Organization"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 ; "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 ; "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 ; "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
WOS KeywordMG ISOTOPES ; CHEMICAL-COMPOSITION ; WEATHERING PROCESSES ; FRACTIONATION ; GEOCHEMISTRY ; CHINA ; CHEMISTRY ; CALCITE ; ISLAND ; DIFFERENTIATION
Language英语
Funding Project"Strategic Priority Research Program" of the Chinese Academy of Sciences[XDB26000000] ; "Strategic Priority Research Program" of the Chinese Academy of Sciences[XDB15010405] ; National Natural Science Foundation of China[91747202] ; National Natural Science Foundation of China[41730857] ; National Natural Science Foundation of China[41402323]
Funding Organization"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 ; "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 ; "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 ; "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
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000457972800011
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90518
Collection新生代地质与环境院重点实验室
Corresponding AuthorLiu, Wenjing; Xu, Zhifang
Affiliation1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.CAS Ctr Excellence Life & Paleoenvironm, Beijing 100044, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Wuhan 430074, Hubei, Peoples R China
5.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Guizhou, Peoples R China
Recommended Citation
GB/T 7714
Zhao, Tong,Liu, Wenjing,Xu, Zhifang,et al. The influence of carbonate precipitation on riverine magnesium isotope signals: New constrains from Jinsha River Basin, Southeast Tibetan Plateau[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2019,248:172-184.
APA Zhao, Tong.,Liu, Wenjing.,Xu, Zhifang.,Sun, Huiguo.,Zhou, Xiaode.,...&Liu, Taoze.(2019).The influence of carbonate precipitation on riverine magnesium isotope signals: New constrains from Jinsha River Basin, Southeast Tibetan Plateau.GEOCHIMICA ET COSMOCHIMICA ACTA,248,172-184.
MLA Zhao, Tong,et al."The influence of carbonate precipitation on riverine magnesium isotope signals: New constrains from Jinsha River Basin, Southeast Tibetan Plateau".GEOCHIMICA ET COSMOCHIMICA ACTA 248(2019):172-184.
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhao, Tong]'s Articles
[Liu, Wenjing]'s Articles
[Xu, Zhifang]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhao, Tong]'s Articles
[Liu, Wenjing]'s Articles
[Xu, Zhifang]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhao, Tong]'s Articles
[Liu, Wenjing]'s Articles
[Xu, Zhifang]'s Articles
Terms of Use
No data!
Social Bookmark/Share
Add to CiteULike Add to Connotea Add to Del.icio.us Add to Digg Add to Reddit Add to Technorati
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.