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Lithium distribution and isotopic fractionation during chemical weathering and soil formation in a loess profile
Tsai, PH (Tsai, Pei-Hsuan)[ 1 ]; You, CF (You, Chen-Feng)[ 1,2 ]; Huang, KF (Huang, Kuo-Fang)[ 3 ]; Chung, CH (Chung, Chuan-Hisung)[ 1 ]; Sun, YB (Sun, You-Bin)[ 4 ]
2014-06-15
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
Volume87Pages:1-10
Subtype期刊论文
Abstract

Lithium (Li) is a fluid-mobile element and delta Li-7 in secondary deposits represents an excellent proxy for silicate weathering and authigenic mineral formation. The soil samples from 1205 to 1295 cm in the Weinan profile, one of the best developed loess-paleosol sequences covering the last glacial-interglacial climatic cycle, were collected and chemically separated into detritus and carbonate fractions for subsequent analyses of Li, delta Li-7, major and trace elements. Other desert specimens (i.e., Qaidam Desert, Tengger Desert, Badain Juran Desert and Taklimakan Desert) near the Chinese Loess Plateau (CLP) and various standard clays were analyzed for assisting provenance determination. The Li and delta Li-7 distributions in the detritus are rather homogeneous, 1.4-2.0 mu g/g and +2.5 parts per thousand to +4.7 parts per thousand, respectively, compared with the carbonate fraction. The detrital delta Li-7 varies systematically with magnetic susceptibility and grain size changes, reflecting significant Li isotopic variation associated with sources and mineralogy of detrital material. On the other hand, Li and delta(7) Li in carbonates show large changes, 781-963 ng/g and -4.1 parts per thousand to +10.2 parts per thousand, respectively. These carbonate Ski correlated well with the estimated index of chemical weathering, as a result of Li mobilization and soil formation during chemical weathering.

KeywordLithium Isotope Weinan Chemical Weathering Secondary Minerals
DOI10.1016/j.jseaes.2014.02.001
Indexed BySCIE
Language英语
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/9795
Collection古环境研究室
Corresponding AuthorYou, CF (You, Chen-Feng)[ 1,2 ]
Affiliation1.Department of Earth Sciences, National Cheng Kung University, Tainan 701, Taiwan;
2.Earth Dynamic System Research Center, National Cheng Kung University, Tainan 701, Taiwan;
3.Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan;
4.State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Beijing 100864, People’s Republic of China
Recommended Citation
GB/T 7714
Tsai, PH ,You, CF ,Huang, KF ,et al. Lithium distribution and isotopic fractionation during chemical weathering and soil formation in a loess profile[J]. JOURNAL OF ASIAN EARTH SCIENCES,2014,87:1-10.
APA Tsai, PH ,You, CF ,Huang, KF ,Chung, CH ,&Sun, YB .(2014).Lithium distribution and isotopic fractionation during chemical weathering and soil formation in a loess profile.JOURNAL OF ASIAN EARTH SCIENCES,87,1-10.
MLA Tsai, PH ,et al."Lithium distribution and isotopic fractionation during chemical weathering and soil formation in a loess profile".JOURNAL OF ASIAN EARTH SCIENCES 87(2014):1-10.
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