Rock magnetic properties of the Xishanping Site,Gansu and its research significance

We have made a series of rock magnetic laboratory tests of susceptibility,frequency dependent susceptibility,thermal magnetic analysis,the non-hysteresis remanence and isothermal remanent magnetization on the section samples of Xishanping site,we analyse the environmental magnetic parameters characteristic changes and attempt to explore the significance of the Xishanping site research to serve the study of the sedimentary sequence containing records of the ancient environment,and provide the basis of rock magnetism for future studies.The results show that the magnetic minerals in the Xishanping site sediments are mainly of low-coercivity magnetite and maghemites,high-coercivity hematite is extremely limited,and the closer to the surface,the concentration of strong magnetic minerals more increase.Magnetic mineral grains show the typical characteristics of loess,but contain a certain amount of super-paramagnetic particles (SP),the closer to the surface,the grains size thinner.From the provenance of the material source,the Xishanping site sediments stem mainly from eolian loess accumulation,aeolian accumulation,and are mixed with a lot of human activity information.Comprehensive study on the relationship between rock magnetic characteristics and human activities for the future has a certain referential significance.