Behavior of rare earth elements in granitic profiles, eastern Tibetan Plateau, China

作     者：Lifeng Cui Zhiqi Zhao Congqiang Liu Sheng Xu Taoze Liu Chenglong Tu Hu Ding 

作者机构：State Key Laboratory of Environmental GeochemistryInstitute of Geochemistry Chinese Academy of SciencesGuiyang 550081 China Scottish Universities of Environmental Research CentreGlasgow G75 0QF UK 

出 版 物：《Acta Geochimica》 (地球化学学报（英文）)

年 卷 期：2017年第36卷第3期

页      面：552-555页

核心收录：

学科分类：070902[理学-地球化学] 0709[理学-地质学] 070901[理学-矿物学、岩石学、矿床学] 07[理学] 

基　　金：funded by National Natural Science Foundation of China(41210004,41603018,41673124 and2013CB956401) ministry of water resources of People’s Republic of China(201401050) 

主　　题：Chemical weathering Eu anomaly Critical zone Soil weathering 

摘      要：Rare earth elements(REEs) can record geologic and geochemical processes. We studied two granitic regolith profiles from different climatic zones in eastern Tibetan Plateau and found that(1)∑ RREEs ranged from119.65 to 275.33 mg/kg in profile ND and5.11–474.55 mg/kg in profile GTC, with average values of205.79 and 161 mg/kg, respectively. ∑RREEs was higher in accumulation horizon and semi-regolith;(2) Influenced by climate, the fractionation of light and heavy REEs(LREEs and HREEs) varied during weathering. The ratio of LREEs/HREEs in pedosphere was higher than semi-regolith in tropical profile;(3) A negative Eu anomaly in both profiles was the result of bedrock weathering. A positive Ce anomaly was observed in all layers of profile ND, and only in the upper 100 cm of profile GTC. This indicates that redox conditions along the regolith profile varied considerably with climate.(4) Normalized by chondrite,LREEs accumulated much more than HREEs; REE distribution curves were right-leaning with a V-type Eu anomaly in both profiles.