Distribution of rare earth elements of granitic regolith under the influence of climate  

作　　者：Hairuo Mao Congqiang Liu Zhiqi Zhao Junxiong Yang 

机构地区：[1]State Key Laboratory of Environmental Geochemistry,Institute of Geochemistry, Chinese Academy of Sciences,Guiyang 550002, China [2]University of Chinese Academy of Sciences, Beijing 100049,China

出　　处：《Acta Geochimica》2017年第3期440-445,共6页地球化学学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant No.41210004;41661144042);National Basic Research Program(973 project)of China(2013CB956401)

摘　　要：The distribution and anomalies of rare earth elements(REEs) of granitic regolith were studied in Inner Mongolia and Hainan Island, China. One profile showed slight REE enrichment of an upper layer and no obvious light REE/heavy REE(LREE/HREE) fractionation(La_N/Yb_N of 0.9). The second profile was significantly enriched in REEs and enriched in LREEs in the upper portion(La_N/Yb_N>1.8). Eu, Ce, and Gd anomalies of the two profiles are different. Slightly negative Eu, Ce, and Gd anomalies in NMG-3-1 indicate slow dissolution of primary minerals and little secondary products; in contrast, a positive Eu anomaly in HN-2 suggests the vegetation cycle may contribute to soil. The Ce anomaly of HN-2 reflects oxidation of Ce and coprecipitation by Fe-and Mn-oxides and organic matter. Correlation between Ce and Gd anomalies in HN-2 suggests Ce and Gd are both influenced by redoxreduction.The distribution and anomalies of rare earth elements（REEs） of granitic regolith were studied in Inner Mongolia and Hainan Island, China. One profile showed slight REE enrichment of an upper layer and no obvious light REE/heavy REE（LREE/HREE） fractionation（LaN/YbN of 0.9）. The second profile was significantly enriched in REEs and enriched in LREEs in the upper portion（LaN/YbN〉1.8）. Eu, Ce, and Gd anomalies of the two profiles are different. Slightly negative Eu, Ce, and Gd anomalies in NMG-3-1 indicate slow dissolution of primary minerals and little secondary products; in contrast, a positive Eu anomaly in HN-2 suggests the vegetation cycle may contribute to soil. The Ce anomaly of HN-2 reflects oxidation of Ce and coprecipitation by Fe-and Mn-oxides and organic matter. Correlation between Ce and Gd anomalies in HN-2 suggests Ce and Gd are both influenced by redoxreduction.

关 键 词：Rare earth elements Granitic regolith WEATHERING Ce anomaly Eu anomaly 

分 类 号：P512.13[天文地球—地质学] P595