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Weathering stage and topographic control on rare earth element (REE) behavior: New constraints from a deeply weathered granite hill

文献类型：期刊论文

作者Liu, Wenjing1,2; Li, Yuanchuan1,2; Wang, Xuan1,2; Cui, Lifeng3; Zhao, Zhiqi; Liu, Congqiang3,4; Xu, Zhifang1,2
刊名CHEMICAL GEOLOGY
出版日期2022-11-05
卷号610页码:16
关键词REE behavior Granite Weathering stage Topography Weathering rate
ISSN号0009-2541
DOI10.1016/j.chemgeo.2022.121066
英文摘要Rare earth elements (REE) are sensitive tracers of rock-water interactions and soil formation processes. In this study, we investigated the REE concentration and distribution patterns for both bulk samples and acid leachable phase for a series of regolith and soil profiles developed on a deeply weathered granite hillslope in a subtropical climate. The exogenous input had little impact on the REE distributions on the studied hillslope. The REE distribution in the profiles was controlled by changes in the physical and chemical environmental parameters and mineral transformation during weathering. However, the specific mechanisms differed among the different weathering stages and profiles located at different positions along the slope. Among the environmental parameters, the profile redox state and acidity were the dominant factors controlling the REE behavior, with organic materials as the main regulators. A strong positive relationship between chemical index of alteration (CIA) and La/Yb was observed for the regolith samples, but the La/Yb ratio decreased upward from a depth of 120 cm (the bottom depth of the soil horizon) as the CIA value increased, suggesting a preference for light REE (LREE) fixation in kaolinite formed during the dissolution of feldspar; however, a conversion occurred during the subsequent pedogenesis period. The hilltop soil profile was characterized by the strongest LREE depletion and the highest positive Ce anomaly (similar to 7.31-14.28), compared with other profiles down the hillslope (similar to 0.84-2.78). The strongest LREE depletion on the hilltop profile JLN-S4 suggested a preference for LREE release resulting from the transformation of kaolinite to gibbsite, and the highest Ce anomaly indicates that Ce was fixed in a more oxidized environment within a well-drained profile. The hill foot profile JLN-S1 had the highest LREE leaching rate, but also the lowest heavy REE (HREE) leaching rate, which was ascribed to its lowest erosion rate, lowest pH value, and reductive conditions in a more hydromorphic zone down the hill. The releasing rates of REE calculated by a mass balance model at different positions along the catena ranged from 1395 to 14,379 mu g m(-2)y(-1). All the observed REE fractionation regimes and weathering rate variations along the hillslope illustrated that topography-regulated hydrologic condition played a critical role in the release and migration of REE during granite weathering.
WOS关键词TRACE-ELEMENTS ; LATERITE PROFILE ; ORGANIC-MATTER ; FRACTIONATION ; MOBILITY ; SOIL ; GEOCHEMISTRY ; REGOLITH ; RATES ; EROSION
资助项目National Natural Science Foundation of China[41730857] ; National Key Research and Develop-ment Program of China[2020YFA0607700] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB26000000] ; Youth Innovation Promotion Association CAS[2019067]
WOS研究方向Geochemistry & Geophysics
语种英语
WOS记录号WOS:000859379600005
出版者ELSEVIER
资助机构National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; National Key Research and Develop-ment Program of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Strategic Priority Research Program of Chinese Academy of Sciences ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS ; Youth Innovation Promotion Association CAS
源URL[http://ir.iggcas.ac.cn/handle/132A11/108328]  
专题地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者Xu, Zhifang
作者单位1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, Beijing 100029, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Tianjin Univ, Inst Surface Earth Syst Sci, Sch Earth Syst Sci, Tianjin 300072, Peoples R China
4.Changan Univ, Sch Earth Sci & Resources, Xian 710054, Peoples R China
推荐引用方式
GB/T 7714		 Liu, Wenjing,Li, Yuanchuan,Wang, Xuan,et al. Weathering stage and topographic control on rare earth element (REE) behavior: New constraints from a deeply weathered granite hill[J]. CHEMICAL GEOLOGY,2022,610:16.
APA Liu, Wenjing.,Li, Yuanchuan.,Wang, Xuan.,Cui, Lifeng.,Zhao, Zhiqi.,...&Xu, Zhifang.(2022).Weathering stage and topographic control on rare earth element (REE) behavior: New constraints from a deeply weathered granite hill.CHEMICAL GEOLOGY,610,16.
MLA Liu, Wenjing,et al."Weathering stage and topographic control on rare earth element (REE) behavior: New constraints from a deeply weathered granite hill".CHEMICAL GEOLOGY 610(2022):16.

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来源：地质与地球物理研究所

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