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《Geochimica》 2008-05
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Major element characteristics of strong reticulate red earth in Dongjiang River Valleys,southern Nanling Mountains during Last Interglacial Stage

WEN Xiao-hao1,LI Bao-sheng1,2,ZHENG Yan-ming1,YE Jian-ping1,LI Hou-xin3,FAN Xiao-ping1,L Ying-xia1,DU Shu-huan1 and NIU Dong-feng1 1.School of Geography,South China Normal University,Guangzhou 510631,China;2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi' an 710061,China;3.Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou 510640,China  
A series of weak and strong reticulate red earth with total thickness of 4.35 m was found at the lower part of Linjiang Profile in the Dongjiang River Valleys of southern Nanling Mountains.The thermoluminescence age at the top of the weak reticulate red earth was(71.4± 6.6)ka B.P.,and in contrast to the Linjiang Profile and other profiles in adjacent regions,it could be presumed that the age of the strong reticulate red earth was within the Last Interglacial Stage.The results of major elements show that the strong reticulate red earth was mainly composed of SiO2,Al2O3 and TFe,which tend to be easily assembled under warm and wet conditions,and their contents range from 60.32% to 67.81%,17.52% to 21.32% and 4.17% to 5.96%,respectively;other major elements such as Na2O,CaO and MgO,which tend to be easily eluviated under warm and wet conditions,and their contents are all below 0.50%,showing being violently eluviated.The strong reticulate red earth belonged to moderate abundant-aluminium on the bases of the major element distributings,weathering eigenvalues and CIA values(weathering intensity index),and its weathering intensity was much close to that of the reticulate red earth in the Xiushui Profile of Jiangxi Province but weaker than that of the reticulate red earth in Baise of Guangxi.
【Fund】: 国家自然科学基金(40471139);; 高等学校博士学科点专项科研基金(20070574005);; 国家重点基础研究发展计划项目(2004CB720206);; 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室开放基金项目(SKLLQG0309);; 中国科学院知识创新工程重要方向项目(KZCX2-SW-118)
【CateGory Index】: P595
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