Eolian evidence from the Chinese Loess Plateau: the onset of the Late Cenozoic Great Glaciation in the Northern Hemisphere and Qinghai-Xizang Plateau uplift forcing

查看全文 作　　者：安芷生;王苏民;吴锡浩;陈明扬;孙东怀;刘秀铭;王富葆;李力;孙有斌;周卫健;周杰;刘晓东;鹿化煜;张云翔;董光荣;强小科 出　　处：《Science China Earth Sciences》索引1999年第42卷第3期,共14页 基　　金：Project supported by the foundation of Chinese Academy of Sciences (Grant No. KZ951-A1-402);the State Science and Technology Committee (Grant No. 95-pre-40);the Chinese Nature Science Foundation (Grant No. 49672140) 摘　　要：On the basis of a newly-constructed record of magnetic susceptibility (SUS) and the depositional rate change of eolian loess-red clay sequences in the last 7.2 Ma BP from the Loess Plateau, together with a comparison of a record of δ¹⁸O values from the equatorial East Pacific Ocean and eolian Quartz flux variations from the North Pacific Ocean, the evolutionary process of the Late Cenozoic Great Glaciation in the Northern Hemisphere can be divided into three stages: the arrival stage around 7.2—3.4 Ma BP, the initial stage at about 3.4—2.6 Ma BP, and the Great Ice Age since 2.6 Ma BP. The evolution of the East Asian monsoon is characterized by paired winter and summer monsoons, and it is basically composed of the initial stage of weak winter and summer monsoons, the transitional stage of simuhaneous increase in intensity of winter and summer monsoons, and the prevailing stage of strong winter and weak summer monsoons, or weak winter and strong summer monsoons. The Late Cenozoic global tectonic 关 键 词：Late Cenozoic EOLIAN deposits of Loess PLATEAU GREAT GLACIATION in the Northern Hemisphere East Asian monsoon evolution QINGHAI-XIZANG PLATEAU uplift.