Enhancement mechanisms of magnetic susceptibility in the Chinese red-clay sequence
作者: |
Nie, J., J.W. King, and X.M. Fang |
期刊名称: |
Geophysical Research Letters |
发表年度: |
2007 |
卷: |
34 |
期: |
19 |
联系作者: |
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页码: |
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摘要: |
[1] Little is known about the mechanisms of magnetic susceptibility ( c) enhancement for the red-clay sequence on the Chinese Loess Plateau (CLP), in comparison to the overlying loess-paleosol sequence. Here we present a rock magnetic study of the red-clay sediments from the central CLP. Our results show that frequency dependence of chi (chi(fd) = chi(lf) - chi(hf), where chi(lf) and chi(hf) are c measured at 470 Hz and 4700 Hz, respectively), chi(lf), and susceptibility of anhystereticremanent-magnetization (chi(ARM)) are linearly correlated within the red-clay sequence. This linear correlation indicates that the pedogenic magnetic minerals of the red-clay have a rather uniform grain size distribution as in the loess-paleosol sequence, and the grain size is independent of the degree of pedogenesis. Nevertheless, red-clay sediments are slightly more enriched in superparamagnetic magnetic particles than the overlying loess-paleosol sediments as indicated by the higher slope of the regression line between cfd and clf..
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