The Correlation between the Content of the Different Grain Size and Magnetic Susceptibility in Lacustrine Sediments, Nihewan Basin

YANG Xiao qian; LI Hua mei

The different grain size content range from 0. 2～ 500 μ m and magnetic susceptiblity were measured to study the correlation between grain size and magnetic susceptibilty, selected more 800 samples, in Lacustrine sedi-ments from Nihewan Bain. The correlation coefficient of susceptibility with the content of 0. 2～ 35 μ m, especially 0.2～ 7.5 μ m, is positive, and with the content of 35～ 500 μ m is negative. This correlation is contrast to the loess deposits on top of profile, which shows the mechanism of magnetic response towardspaleoclimate changes in lacus-trine sediments is unlike that in loess. So, we can conclude that the susceptibility change in lake ( the sedimentsare mainly allogenic)sediments is controlled by the allogenic magnetic minerals. The fluctuations of susceptibilty indi-cate the changes of the lake level and paleoclimate.

1 Department of Earth Sciences, Sun Yat Sen University, Guangzhou 510275;

2 Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640

Received Date: 2001-06-25

Rev Recd Date: 2002-05-09

Key words:

Haojiatai Section /
the content of the different grain gize /
magnetic susceptibility

Abstract: The different grain size content range from 0. 2～ 500 μ m and magnetic susceptiblity were measured to study the correlation between grain size and magnetic susceptibilty, selected more 800 samples, in Lacustrine sedi-ments from Nihewan Bain. The correlation coefficient of susceptibility with the content of 0. 2～ 35 μ m, especially 0.2～ 7.5 μ m, is positive, and with the content of 35～ 500 μ m is negative. This correlation is contrast to the loess deposits on top of profile, which shows the mechanism of magnetic response towardspaleoclimate changes in lacus-trine sediments is unlike that in loess. So, we can conclude that the susceptibility change in lake ( the sedimentsare mainly allogenic)sediments is controlled by the allogenic magnetic minerals. The fluctuations of susceptibilty indi-cate the changes of the lake level and paleoclimate.

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Reference (16)

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The Correlation between the Content of the Different Grain Size and Magnetic Susceptibility in Lacustrine Sediments, Nihewan Basin

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