Element geochemical characteristics of the reticulate red clay in southern China and its significance for the formation proccess of reticulated mottles
Xu Chuanqi1, Liao Fuqiang1, 2, Jia Yulian1, 2, Huang Siyuan1, Lian Licong1, Ling Chaohao1, Long Jin1
1 Department of Geography and Environment,Jiangxi Normal University,Nanchang 330022,Jiangxi; 2 Ministry Education Key Laboratory of Poyang Lake Wetland and Watershed Research,Nanchang 330022,Jiangxi
Abstract：Reticulate red clay in southern China is a kind of special stratum that formed in a monsoon climate condition,which is of great significance to reconstruct the Quaternary climate environment. For a long time,there is a lack of adequate understanding of physical and chemical characteristics of the formation process of reticulated mottles. Three sections of reticulate red clay,which were located in the Jiujiang and Pengze of Jiangxi Province, and Yueyang of Hunan Province, were studied, and the red matrix and the white reticulated mottles were separated and the geochemical elements,free iron content and so on were analysed. The results show that:(1)In the white reticulated mottles, Fe,Mn,Th,Ga,Cu,Zn,Co,Ni,Cr,V elements are outstanding leaching,while Zr,SiO2,Hf and light rare earth elements are obvious enriched,and the content of free iron are low; in the red matrix, they are reversed. (2)Fe2+ content is higher in the white reticulate,while lower in the matrix,which indicates white reticulate tend to be developed in a reductive environment and matrix tend to be developed in an oxidized environment. The difference of oxidation reduction between white reticulated mottles and red matrix is supposed to be the reason why Fe,Mn,Co,Ni,Cr,V,Zn,Th,Ga,Cu are leaching in the white reticulated mottles and enriched in the matrix, which cause Zr,SiO2 and light rare earth elements relative enriched in the white reticulated mottles and “dilution” in the red matrix.
Xu Chuanqi,Liao Fuqiang,Jia Yulian et al. Element geochemical characteristics of the reticulate red clay in southern China and its significance for the formation proccess of reticulated mottles[J]. JOPC, 2016, 18(5): 865-878.
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