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Pedogenic processes in loess-paleosol sediments: Clues from Li isotopes of leachate in Luochuan loess
He, Mao-Yong1,2; Dong, Ji-Bao1,2; Jin, Zhangdong1,2,3; Liu, Chun-Yao4; Xiao, Jun1,2; Zhang, Fei1,2; Sun, He5; Zhao, Zhi-Qi6; Gou, Long-Fei1; Liu, Wei-Guo1,2; Luo, Chong-Guang7; Song, You-Gui1,2; Ma, Long8,9; Deng, Li1,2,10,11
Corresponding AuthorHe, Mao-Yong( ; Jin, Zhangdong(
AbstractTracing pedogenic processes is fundamental for reconstructing climatic and environmental changes using loess deposits. Lithium isotopes can serve as a sensitive tracer to unravel these processes, owing to its active behaviors without effect by redox and biological reactions. This study investigated the Li contents and delta Li-7 values of leachate and residue ([Li](leachate), [Li](residue), delta Li-7(leachate) and delta Li-7(residue)) of the upper 12.5m Luochuan loess-paleosol sediment (since the last interglacial) on the Chinese Loess Plateau, in order to better understand pedogenic processes in loess. The [Li](leachate), varying from 0.39 to 1.97 mu g/g, is mainly derived from the adsorption phase, with a significant variation in delta Li-7(leachate), from -6.55 parts per thousand to +12.88 parts per thousand. Both [Li](leachate) and delta Li-7(leachate) variations reflect weathering and adsorption processes during different periods. The [Li](residue) vary from 34.4 to 46.3 mu g/g (averaging 38.4 mu g/g) and their delta Li-7(residue) vary from -3.66 parts per thousand to +2.44 parts per thousand (averaging -0.22 +/- 1.68 parts per thousand), both in agreement with the upper continental crust values. At initial stage after loess deposited (stage I), high [Li](leachate) but low delta Li-7(leachate) are results of preferential adsorption of Li-6 by clays and migration of 7Li with soil solution during weathering and eluviation processes. When overlying loess was deposited and experienced pedogenesis as the stage I, Li-7 migrated downward and was adsorbed by clays (stage II), resulting in high [Li](leachate) and delta Li-7(leachate) in underlying loess. When loess has superimposed pedogenic and adsorption processes as the stages I and II, loess became as paleosol with highest delta Li-7(leachate) in underlying carbonate accumulation layer. A persistent increase in delta Li-7(leachate) indicates dominant control of post-depositional adsorptions on Li fractionation along solution migrations during weathering and eluviation of overlying deposits, and vice versa. These results highlight that variations in [Li](leachate) and delta Li-7(leachate) can be used to trace soil water migration processes and the magnitude of pedogenic processes in loess-paleosol sediment at different periods. (C) 2021 Elsevier Ltd. All rights reserved.
KeywordLithium isotopic composition Loess-paleosol deposits Pedogenic processes Weathering Eluviation Migration
Indexed BySCI ; SCI
Funding ProjectCAS Interdisciplinary Innovation Team ; NSFC[41930863]
WOS Research AreaGeochemistry & Geophysics
Funding OrganizationCAS Interdisciplinary Innovation Team ; NSFC
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000632521900009
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorHe, Mao-Yong; Jin, Zhangdong
Affiliation1.Chinese Acad Sci, Inst Earth Environm, State Key Lab Loess & Quaternary Geol, Xian 710061, Peoples R China
2.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
3.Xi An Jiao Tong Univ, Inst Global Environm Change, Xian 710049, Peoples R China
4.UCL, London Geochem & Isotope Ctr LOGIC, Gower Pl, London WC1E 6BT, England
5.Hefei Univ Technol, Sch Resources & Environm Engn, Hefei 230009, Peoples R China
6.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
7.Chinese Acad Sci, Inst Geochem, State Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China
8.Northwest Univ, Dept Geol, State Key Lab Continental Dynam, Xian 710069, Peoples R China
9.Northwest Univ, Dept Geol, Shaanxi Key Lab Early Life & Environm, Xian 710069, Peoples R China
10.Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian 710061, Peoples R China
11.Natl Observat & Res Stn, Crit Zone & Terr Surface Flux, Chinese Loess Plateau, Xian 710061, Peoples R China
Recommended Citation
GB/T 7714
He, Mao-Yong,Dong, Ji-Bao,Jin, Zhangdong,et al. Pedogenic processes in loess-paleosol sediments: Clues from Li isotopes of leachate in Luochuan loess[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2021,299:151-162.
APA He, Mao-Yong.,Dong, Ji-Bao.,Jin, Zhangdong.,Liu, Chun-Yao.,Xiao, Jun.,...&Deng, Li.(2021).Pedogenic processes in loess-paleosol sediments: Clues from Li isotopes of leachate in Luochuan loess.GEOCHIMICA ET COSMOCHIMICA ACTA,299,151-162.
MLA He, Mao-Yong,et al."Pedogenic processes in loess-paleosol sediments: Clues from Li isotopes of leachate in Luochuan loess".GEOCHIMICA ET COSMOCHIMICA ACTA 299(2021):151-162.
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