Abstract:

Taking drillinghole ZL located at the center of Jianghan Basin as an example, with method of ICP-MS,the R factor of trace element compositions of cores from the hole is analyzed to reveal sediment sources’ changes in Jianghan Basin since Quaternary in this paper. The results show that during 2.77 to 2.68 Ma B.P.,the deposition process is mainly near source according to trace element compositions of sediments in Jianghan Basin; during 2.68 to 2.23 Ma B.P.the clastic deposition in Jianghan Basin is obviously affected by felsic; during 2.23 to 1.25 Ma B.P. and since 1.25 Ma BP.the trace element of sediments is affected by Fe-Mg rocks, and it is indicated that the upper reaches of the Yangtze River which has a large-scale basic rocks distribution is the source provider of Jianghan Basin.

Key words: Jianghan Basin, sedimental provenance, Quaternary, factor analysis