干旱区生态环境知识资源中心(Arid): 鄱阳湖湖滨十万年来沙山的演化

Arid

	鄱阳湖湖滨十万年来沙山的演化
其他题名	Study on the evolution of sandy hills along Poyang Lake area for the last 100,000 years
	任黎秀; 和艳; 杨达源
ISSN	1000-0585
出版年	2008
卷号	27 期号:1 页码:128-134
中文摘要	鄱阳湖湖滨及湖口-彭泽段长江南岸有成群沙垄、沙山分布。2005年调查发现，可分为4个风成沙山期及7类沉积物。4个风成沙山期分别为95kaB．P．的老红沙山期、46kaB．P．的红沙山期、27kaB．P．～15kaB．P．左右的黄沙山期、250年来的近代沙山期。此外还有温暖时期沟谷里水动力作用下的次生堆积，湖滩上的风蚀残余沙以及黄沙山表面现代松散沙。比较不同时期风沙沉积的粒度组成，4个时期的风力大小基本呈现黄沙山期〉近代沙山期〉红沙山期〉老红沙山期的状态，以上特点与末次间冰期以来多个亚冰期全球气候寒冷程度的变化具有可比性。
英文摘要	Poyang Lake, which lies to the east of Mount Lushan in Jiangxi, is the biggest fresh water lake in China. It is also one of the abandoned lakes of the Yangtze River. As it is in the eastern monsoon area, it has a line vision in winter and a vast expanse in summer. Large areas of sandy hills appear around the Poyang Lake and the riverside of the Yangtze Rriver in the Hukou-Pengze section. They are well sorted and always come to 40 to 140 m high, looking like a desert in East China. Lots of scientists have done research in these sandy hills since the mid-20th century. They started with the formation and evolution of these sandy hills, and some of them analyzed the ancient climate change by the magnetic properties of sand samples. Shaling sandy hill in Xingzi which lies on the west shore of Poyang Lake is one of those sandy hills. After field investigation and collection of 26 sandy sediment samples in March 2005, we used sifter and laser granularity to measure their grain size. We also use ~(14)C dating and thermoluminescence dating for three samples. Based on the field investigation of the landform and physiognomy, we classified these sandy sediments in Xingzi into seven different kinds and four periods of aeolian sandy hills. Those four aeolian sandy hills periods are 95 kaB.P. Old Red Dune, 46 kaB.P. Red Dune, 27kaB.P.-15kaB.P. Yellow Dune and 250 years Modern Dune. The other three kinds of sediments are secondary deposit on valley bottom, wind-erosion residual deposit on the lake shore and loose aeolian sediments on the Yellow Dune surface. As the wind power is the main driver of sand, the grain size of these aeolian sediments can show the wind power for the time when they deposited. We compared the grain size of the sand samples and come to the conclusion that wind power in these four periods can be arranged by Yellow Dune, Modern Dune, Red Dune, and Old Red Dune in a descending order. By comparson of the sediment series with the deep-sea oxygen isotope curve change, the Old Red Dune period of Poyang Lake is in the late Wurm glaciation （MISSb）, Red Dune period is in the middle Wurm glaciation （MIS3）, Yellow Dune is in the last glacial maximum （MIS2）, and Modern Dune is in the Little Ice Age. This result accords with the research result of sandy hills of this area by other scientists and can be compared with the global change in stade since the last interglacial stage and show the change of winter monsoon in Poyang Lake area.
中文关键词	鄱阳湖 ; 沙山 ; 粒度分析 ; 风力
英文关键词	Poyang Lake aeolian-dust deposit grain size analysis wind power
语种	中文
国家	中国
收录类别	CSCD
WOS类目	GEOSCIENCES MULTIDISCIPLINARY
WOS研究方向	Geology
CSCD记录号	CSCD:3256131
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/222122
作者单位	南京大学地理与海洋科学学院, 南京, 江苏 210093, 中国
推荐引用方式 GB/T 7714	任黎秀,和艳,杨达源. 鄱阳湖湖滨十万年来沙山的演化[J],2008,27(1):128-134.
APA	任黎秀,和艳,&杨达源.(2008).鄱阳湖湖滨十万年来沙山的演化.,27(1),128-134.
MLA	任黎秀,et al."鄱阳湖湖滨十万年来沙山的演化".27.1(2008):128-134.