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对黄土高原较完整的晚新生代风尘堆积序列的磁性地层研究表明 ,风尘堆积成壤序列开始发育的时代约为 7.2Ma,如果认为亚洲季风气候的起源与青藏高原的高度密切相关的话 ,风尘堆积在 7.2Ma的出现则可能意味着青藏高原在此时达到了有意义的高度 ,东亚古季风环流基本建立 .黄土高原的红粘土序列由 7个显著的红色黄土层以及与其相间的 7个古土壤组合组成 ,它们记录了 7.2～ 2 .6Ma的晚第三纪东亚古季风演变的历史 .
The magnetic stratigraphic study on the relatively complete late-Cenozoic dust deposition sequence on the Loess Plateau shows that the sequence of the onset of dust deposition pedogenesis sequence is about 7.2 Ma. If the origin of the Asian monsoon climate is thought to be closely related to the altitude of the Qinghai-Tibet Plateau, The occurrence of 7.2Ma may mean that the Qinghai-Tibet Plateau reaches a meaningful height at this time, and the circulation of the East Asian monsoon is basically established. The sequence of red clay in the Loess Plateau consists of seven distinct red loess layers and seven paleo-earths They record the history of the evolution of the late Paleo-East Asian monsoon from 7.2 to 2.6 Ma.