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《Marine Geology & Quaternary Geology》 2005-02
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GRAIN-SIZE ANALYSIS OF HOLOCENE SOIL AND PALEO-ENVIRON-(MENTAL) SIGNIFICANCE IN THE NORTH BANK OF THE YANGTZE RIVER,NANJING

MAO Long-jiang~1,LI Ya-bing~1,WANG Ji-ping~1,JIA Yao-feng~2,ZOU Xin-qing~1(1 Ministry of Education Laboratory for Coast and Island Development, Nanjing University, Nanjing 210093,China;2 Department of Tourism and Environment, Shannxi Normal University, Xi'an 710062,China )  
Field investigation and the grain-size analysis in a loess profile of Holocene in the north bank of the Yangtze River, Nanjing, have revealed the characteristics of the environmental change during the last 10 000 years. The results show that a paleosol layer was formed during the Holocene climate optimum((8 500)~3 100 (aBP)) in the north bank of the Yangtze River, and the climate became warmer and wetter, so the speed of pedogenesis rate was much larger than that of the dust deposition. Therefore, the loess formed in the last glacial became the substance on which the paleosol re-developed. There is a transformation period at 3 100 (aBP), which represents a climate change from the period dominated by the southern monsoon to the period dominated by northern monsoon. A modern loess layer (about 50 cm) has been accumulated since 3 100 (aBP),meaning that the last 3 100 years is a period with intensified dust accumulation.
【Fund】: 南京大学地球科学系国家重点实验室开放基金;; 教育部博士点基金(20020284005);; “973”子课题(0209H024)
【CateGory Index】: P532
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