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High Resolution Record of Malan Loess in the Longxi Loess Plateau and Rapid Climate Changes during the Last Glaciation

Chen Fahu, Ma Yuzhen and Li JiJun (Department of Geograpgy, Lanzhou University, 730000)  
Loess is Widely distributed in the Longxi Loess Plateau. Loess deposiition in the plateau is quite sensiitive to enviironmental and/or climatic changes. Because it is relative thick in the Plateau the loess climatic record has high resolution. Malan loess is 30 m to 50 m thick in the plateau. Yuandao section in Linxia basin and Gaolanshan section in Lanzhou are two typicalMalan loess sections in the plateau with more than 30 m thick Malan loess. It is found that there are 22 weak pedogeniic layers in it. They are the record of interstades in the last glaciation. From pedogenic structures, magnetic susceptibility index, pollen and spore composition and others it is known that climates in the interstades were relative warm and moist. The Mallan loess record is quite coincited with Greenland GRIP ice core record, reflecting the general instable climate for whole global during the last glaciation. In middle part of Malan loess thare are a thick interstadial pedogenic layer with three main paleosols. The climate in that period was quite moist, and possible as warm as presen tin some time especially in the bottom paleosol formation. In wewtern China, Water Level of Inland Lakes was higher than that of Presents. The interstade in China appeared as a Mega_interstade.
【Fund】: 国家自然科学青年基金会项目 国家教委优秀中青年教师基金
【CateGory Index】: P642.131
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