Magnetic fabric characters and its climatic environmental significance from a sediment section in Jiangling of Hubei Province

【Author】

Yufen Zhang, Chang'an Li, Xuehua Dong, Yuantao Zhou Institute of Geophysics and Geomatic, China University of Geosciences, Wuhan, China Faculty of Earth Science, China University of Geosciences, Wuhan, China

【Abstract】

<正>The paleoclimate and paleoenvironment evolution since Holocene in Jianghan lake area of Hubei province are recovered based on the study of magnetic fabric characters, profile lithology feature of sediments and the testing of 14C dating. ①Jianghan lake since Holocene has gone through 4 large-scale different climatic, environmental evolution processes and some little climatic fluctuation have also accompanied in the big climatic cycle. ②The sedimentary environment in Jianghan lake evolved gradually from lake facies, to lake moor facies to river facies. From 9874aB. P. to 6610aB. P., sediment environment of lake facies was dominating, from 6610aB. P to 2537aB. P., sediment environment of lake moor facies was dominating, from 2537aB. P to 693aB. P., sediment environment of river facies was dominating. ③It is indicated that the magnetic susceptibility curves of lake sediments are sensitive to the features of paleoclimate and paleoenvironment since Holocene. The change shows its regularity that the lower values of susceptibility respond to the warmer and wetter climatic and reduction environment, whereas the higher values of susceptibility respond to the drier and colder climatic and oxidation environment. ④It is also indicated that the sediment environment and hydrodynamic condition are more stable when the magnetic fabric parameter P, F, L, T is higher values and q is lower values, on the contrary, indicate the unstable. High q value is an important index for indicating event sediment.

【Keywords】

Jiangling of Hubei Province, magnetic fabric characters, paleoclimate and paleoenvironment

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