Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption

doi:10.1016/j.scitotenv.2021.147235

IEECAS OpenIR > 加速器质谱中心

	Lithium isotopic features of Quaternary basaltic saprolite, Zhanjiang, China: Atmospheric input and clay-mineral adsorption
	Tong, Fengtai 1; Xiao, Yilin 1,2; Sun, He 3; Wang, Yangyang 1; Wan, Hongqiong 1; Gou, Long-Fei 4; Gong, Yingzeng 1; Huang, Fang 1,2; Li, Dong-Yong 1; Hou, Zhenhui 1
通讯作者	Xiao, Yilin(ylxiao@ustc.edu.cn)
	2021-09-01
发表期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
卷号	785 页码:12
摘要	Silicate 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.
关键词	Lithium isotope systematics Basaltic weathering Isotopic fractionation Weathering intensity
DOI	10.1016/j.scitotenv.2021.147235
关键词[WOS]	LI ISOTOPES ; WEATHERING PROCESSES ; TRACE-ELEMENTS ; FRACTIONATION ; BEHAVIOR ; GEOCHEMISTRY ; CHEMISTRY ; SYSTEMATICS ; RIVERS ; EARTHS
收录类别	SCI ; SCI
语种	英语
资助项目	Strategic 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研究方向	Environmental Sciences & Ecology
项目资助者	Strategic Priority Research Program (B) of CAS ; Natural Science Foundation of China ; State Key Laboratory of Ore Deposit Geochemistry open funds
WOS类目	Environmental Sciences
WOS记录号	WOS:000659455600016
出版者	ELSEVIER
引用统计	被引频次：10[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/16778
专题	加速器质谱中心
通讯作者	Xiao, Yilin
作者单位	1.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
推荐引用方式 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.