The Yushu Loess Deposition in Eastern <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:place w:st="on"><st1:PlaceName w:st="on">Songnen</st1:PlaceName> <st1:PlaceType w:st="on">Basin</st1:PlaceType></st1:place> since the Last Glacial Period and Its Environmental Significance<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" /><o:p></o:p>

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The Yushu Loess Deposition in Eastern Songnen Basin since the Last Glacial Period and Its Environmental Significance

详细信息

责任者：Yin Zhiqiang (China Institute of Geo-Environment Monitoring ; Beijing 100081 ; China) ; Qin Xiaoguang
刊名：Geology in China
出版年：2010
卷期：37(1)
关键词：黄土 ; loess ; 古环境 ; paleoenvironment ; 松嫩平原 ; Songnen Plain
页码：p.212-222
图表：6 illus., 1 table, 48 refs.
分类号：1400
issnNo：ISSN1000-3657
isbnNo：CN11-1167/P

摘要

///Magnetic susceptibility and grain-size distribution of the loess-river sand profile in eastern Songnen Plain of northeastern China since the last glacial period were analyzed, and the paleo-environmental history of this region was investigated. The results demonstrate that: 1) the loess deposition of eastern Songnen plain occurred at least 46 ka B. P. , i. e. , at the last glacial period; 2) the loess dust of eastern Songnen basin mainly came from the Keerqin desert, the Songnen desert and other large deserts in northwest areas, and the Keerqin desert was extensively developed in the last glacial period; 3) there was a tectonic movement 40 ka B. P. in Songnen basin, and after this movement, loess dust was deposited in Yushu area with the development of the keerqin desert; and 4) the climate evolution of northeastern China in Holocene can be divided into five stages, being respectively about 10 000 a B. P. , some 9 000 a B. P. , around 6 000 a B. P. , 4 500 a B. P. and 2 500 a B. P. in age.

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