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Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption
Tong, Fengtai1; Xiao, Yilin1,2; Sun, He3; Wang, Yangyang1; Wan, Hongqiong1; Gou, Long-Fei4; Gong, Yingzeng1; Huang, Fang1,2; Li, Dong-Yong1; Hou, Zhenhui1
Corresponding AuthorXiao, Yilin(ylxiao@ustc.edu.cn)
2021-09-01
Source PublicationSCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
Volume785Pages:12
AbstractSilicate weathering, in particular basalt, accounting only for one-sixth of the continental crust volume, accounts for one-third of atmospheric CO2 drawn down during weathering, as such, playing an important role in long-term carbon cycling. Li contents and isotopic compositions of a tropical regolith developed on young basalt (ca. 1 Ma) were investigated to elucidate Li isotopic fractionation during basalt weathering so as to trace basalt weathering. Li isotopic composition of sand from Asian dust-source regions and local dust near the basaltic saprolite weathering profile were studied as possible atmospheric contributors of Li to the saprolite. Saprolite has delta Li-7 values of -6.8% to -2.2%, which is much lighter than that of fresh basalt (+3.5%). Approximately 30% of the Li was lost from the upper saprolite profile, without significant isotopic fractionation. Lithium is enriched at the bottom of the profile, showing the lightest Li isotopic composition (delta Li-7=-6.6% to-2.6%). Calculations indicates that marine aerosols are the main source of atmospheric Li input to the profile. Adsorption of Li by secondary minerals results Li isotopic fractionation, accompanying desorption and resorption of Li by secondary minerals, resulting enriched Li and light Li isotopic composition in the regolith. A model established that Li isotopes showed sensitivity to continental weathering, supporting that Li isotopes can serve as an indicator of continental weathering. Continental weathering in the study area recorded the reasons of heavier Li isotopic composition of river water and seawater suggesting that Li isotopes can be used to study the circulation of materials on the Earth's surface. This has a guiding role in studying the Li isotopic composition of shale and rivers. The influence of temperature and precipitation on the fractionation behavior of lithium isotopes during silicate weathering warrants further investigation. (C) 2021 Elsevier B.V. All rights reserved.
KeywordLithium isotope systematics Basaltic weathering Isotopic fractionation Weathering intensity
DOI10.1016/j.scitotenv.2021.147235
WOS KeywordLI ISOTOPES ; WEATHERING PROCESSES ; TRACE-ELEMENTS ; FRACTIONATION ; BEHAVIOR ; GEOCHEMISTRY ; CHEMISTRY ; SYSTEMATICS ; RIVERS ; EARTHS
Indexed BySCI ; SCI
Language英语
Funding ProjectStrategic Priority Research Program (B) of CAS[XDB41000000] ; Strategic Priority Research Program (B) of CAS[XDB18000000] ; Natural Science Foundation of China[42073003] ; State Key Laboratory of Ore Deposit Geochemistry open funds[201608]
WOS Research AreaEnvironmental Sciences & Ecology
Funding OrganizationStrategic Priority Research Program (B) of CAS ; Natural Science Foundation of China ; State Key Laboratory of Ore Deposit Geochemistry open funds
WOS SubjectEnvironmental Sciences
WOS IDWOS:000659455600016
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/16778
Collection加速器质谱中心
Corresponding AuthorXiao, Yilin
Affiliation1.Univ Sci & Technol China, CAS Key Lab Crust Mantle Mat & Environm, Sch Earth & Space Sci, Hefei 230026, Peoples R China
2.CAS Ctr Excellence Comparat Planetol, Hefei 230026, Peoples R China
3.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
4.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
Recommended Citation
GB/T 7714
Tong, Fengtai,Xiao, Yilin,Sun, He,et al. Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2021,785:12.
APA Tong, Fengtai.,Xiao, Yilin.,Sun, He.,Wang, Yangyang.,Wan, Hongqiong.,...&Hou, Zhenhui.(2021).Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption.SCIENCE OF THE TOTAL ENVIRONMENT,785,12.
MLA Tong, Fengtai,et al."Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption".SCIENCE OF THE TOTAL ENVIRONMENT 785(2021):12.
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