| Abstract: | We made comparison of magnetic property between two loess/paleosol sediments from the Beiyuan section, Linxia and the Shajinping section, Lanzhou. The two sections apart only 100 km in NE-SW direction. At the Beiyuan section, enhancement of the low-field magnetic susceptibility, ARM susceptibility and SIRM are observed in paleosols. The positive correlations among these three parameters suggest the presence of two magnetic components, i.e. the background component and the enhanced component. The unblocking curves of low-temperature IRM give strong evidence for the idea of the two components. On the contrary, the magnetic parameters are almost constant throughout the Shajinping section. The enhanced component is not found in the Shajinping section. The magnetic properties of the background component are indistinguishable between the two sections. Contrasting magnetic properties imply the difference of soil formation process between the two sections. |
