Geochemical Characteristics of Trace Elements in the Marine Surface Sediments Outer Yangtze River Estuary

Abstract

Abstract:

This study analyzed the abundance of 25 trace elements in 187 pieces of marine surface sediments outer Yangtze River estuary using correlation analysis and Rmode factor analysis，and discussed the variation coefficient，and the source and distribution characteristics of trace elements in the sediments. Elements of Li,V,Cr,Co, Ni,Ga,Cu,Zn,Th and Rb have similar distributions, whereas Sr is negatively correlated with elements of Li,Cu, Pb, Zn, Th and Rb. The distribution of Sr in the southeast part of the study area reveals a clear link to source materials related to the biogenic process, whereas the distribution of Zr reflects the influence of materials from Yangtze River. The distributions of Cd and Mo are not obviously correlated with the type and granularity of sediments, but are mainly controlled by redox environment. The results of correlation analysis and Rmode factor analysis show that the sedimentation，grain size effect，marine biogenic process, redox environment and geological background of the source area play a dominant role in controlling the distribution of the contents of trace elements in marine surface sediments outer Yangtze River estuary.

Key words: trace element, marine surface sediment, distribution, outer Yangtze River estuary

LA Xian-Hong, ZHANG Zhi-Xun, LI Ri-Hui, WANG Zhong-Bei, CHEN Xiao-Hui, HOU Fang-Hui. Geochemical Characteristics of Trace Elements in the Marine Surface Sediments Outer Yangtze River Estuary[J]. Geoscience, 2011, 25(6): 1066-1076.

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