六盘山山前盆地新近系岩石磁学研究

he study of the characteristics of rock magnetism provides bases for identifying the categories of magnetic minerals in the rocks, demagnetization experiments and separating magnetic components, especially can judge whether magnetization of the rock is original or not. Therefore the study of the characteristics of rock magnetism is a basis of paleomagnetic chronology. In this paper, we research the rock magnetic properties of samples from the upper tertiary Cenozoic Gansu group strata in the Liupan Shan foreland basin, and gain some better results. It revealed that magnetic minerals in the strata of Lanpan Shan area depositing in Neocene are chiefly composed of hematite, maghemite, magnetite and goethite. This will be a solid foundation of the determining the paleomagnetic chronological layers for this section.