Little is known about the mechanisms of magnetic susceptibility (÷) 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 ÷ (÷fd = ÷lf - ÷hf , where ÷lf and ÷hf are ÷ measured at 470 Hz and 4700 Hz, respectively), ÷lf, and susceptibility of anhysteretic-remanent-magnetization (÷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 ÷fd and ÷lf.
AGU Fall Meeting Abstracts
- Pub Date:
- December 2007
- 1512 Environmental magnetism;
- 1519 Magnetic mineralogy and petrology;
- 1540 Rock and mineral magnetism;
- 1637 Regional climate change