对黄土高原西部序浪红粘土进行详细岩石磁学分析表明,沉积物磁性由磁铁矿和赤铁矿主导,并且含有一定量的磁赤铁矿。中中新世大暖期红粘土中磁铁矿、磁赤铁矿含量显著升高;中中新世大暖期前后红粘土中的磁铁矿含量相对较低,赤铁矿相对含量较高,但并未显示较强的磁赤铁矿信息。磁性矿物的整体粒径表现为以SP,SD和PSD颗粒为主,MD颗粒较少。庄浪红粘土磁化率在16.5～13.8Ma出现峰值,与当时的夏季风强盛、降水丰富、成壤作用较强造成的亚铁磁性矿物相对含量增加密切相关。在全球气候变暖的中中新世大暖期,综合庄浪岩石磁学特征以及陆地和海洋的其他证据可以推测当时东亚冬、夏季风可能同时增强。 Detailed rock magnetocentric analysis of the sequence-surfacing red clay in the western Loess Plateau shows that the magnetism of the sediments is dominated by magnetite and hematite and contains a certain amount of maghemite. The contents of magnetite and maghemite in the red clay of the Mid-Miocene were significantly increased. The content of magnetite in the red clay before and after the Mid-Miocene was relatively low, and the content of hematite was relatively high , But did not show strong maghemite information. The overall particle size of magnetic minerals is mainly SP, SD and PSD particles, MD particles less. The magnetic susceptibility of Zhuanglang red clay peaked at 16.5 ~ 13.8Ma, which was closely related to the increase of the relative content of ferromagnetic minerals caused by the strong summer monsoon, abundant rainfall and strong pedogenesis. In the mid-Miocene Megathermal global warming, combining the magnetic characteristics of Zhuanglang rock and other evidence on land and sea, it can be presumed that the East Asian winter monsoon and the summer monsoon may be enhanced at the same time.