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Enhancement mechanisms of magnetic susceptibility in the Chinese red‐clay sequence
Author(s) -
Nie Junsheng,
King John W.,
Fang Xiaomin
Publication year - 2007
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2007gl031430
Subject(s) - loess , pedogenesis , geology , paleosol , magnetic susceptibility , sequence (biology) , remanence , superparamagnetism , mineralogy , grain size , plateau (mathematics) , clay minerals , loess plateau , geochemistry , soil water , geomorphology , soil science , magnetization , chemistry , condensed matter physics , mathematics , magnetic field , physics , mathematical analysis , biochemistry , quantum mechanics
Little is known about the mechanisms of magnetic susceptibility ( χ ) 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 χ ( χ fd = χ lf − χ hf , where χ lf and χ hf are χ measured at 470 Hz and 4700 Hz, respectively), χ lf , and susceptibility of anhysteretic‐remanent‐magnetization ( χ 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 χ fd and χ lf.