Enhancement mechanisms of magnetic susceptibility in the Chinese red-clay sequence

Details Enhancement mechanisms of magnetic susceptibility in the Chinese red-clay sequence Enhancement mechanisms of magnetic susceptibility in the Chinese red-clay sequence

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3419705n&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 19, CiteID L19705

Physics

6

Geomagnetism And Paleomagnetism: Environmental Magnetism, Geomagnetism And Paleomagnetism: Magnetic Mineralogy And Petrology, Geomagnetism And Paleomagnetism: Rock And Mineral Magnetism, Global Change: Regional Climate Change

Scientific paper

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.

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