REE geochemical characteristics of mottled clays of the Late Quaternary in the Pearl River Delta
Liu Chunlian1,2, Yang Tingting1, Wu Jie1,2, Xia Bin3, Huang Yi1, Zhang Suqing1
1 Department of Earth Sciences， Sun Yat-Sen University， Guangzhou 510275，Guangdong 2 Guangdong Provincial Key Laboratory of Mineral Resources & Geological Processes， Guangzhou 510275，Guangdong 3 Key Laboratory of Offshore Oil Exploration and Development of Guangdong Higher Education Institutes， Guangzhou 510275，Guangdong
Abstract：A layer of mottled clays，sandwiched between the Upper Pleistocene and the Holocene，is widely distributed in the Pearl River Delta area.It was the weathering product of the Upper Pleistocene sediments and mainly formed during the last glacial maximum.Geochemical analysis on three cores（PRD09，PRD16 and PRD17）suggests an apparent change in REE content and fractionation during the weathering.The total REE concentrations of the mottled clays are largely lower than those of underlying sediments.The proximate underlying sediments show a clear enrichment in REE，particularly in HREE.PRD09 and PRD17，subjected to a more intensive weathering，exhibit more enrichment in REE than PRD16 that shows a less weathering intensity.The acidic condition developed in the Pearl River Delta area during the last glacial，which enhanced the mobility of the REE elements.Higher LREE/HREE，（La/Gd)N and（La/Yb)N values in mottled clays than in underlying sediments were resulted from different mobility and adsorption on clay minerals of LREE and HREE during weathering.It seems that the weathering had less influence on anomaly of Ce and Eu.The mottled clays show slightly more negative Ce and Eu anomaly than underlying sediments.
Liu Chunlian,Yang Tingting,Wu Jie et al. REE geochemical characteristics of mottled clays of the Late Quaternary in the Pearl River Delta[J]. JOPC, 2012, 14(1): 125-132.
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