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《Scientia Geographica Sinica》 2006-05
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Terraces Along Sanduizi-Wudongde Secton of Jinsha River

XU Qin-Mian~1,YANG Da-Yuan~2,GE Zhao-Shuai~3,CHEN De-Ji~4,XUE Guo-Fu~5(1.Tianjin Institute of Geology and Mineral Resources,China Geological Survry,Tianjin 300170;2.Department of Urban and Resources Sciences,Nanjing University,Nanjing,Jiangsu 210093;3.School of Urban and Environmental Sciences, Xuzhou Normal University,Xuzhou,Jiangsu 221116;4.Changjiang Exploration Planning Design Institute,Wuhan,Hubei 430010;5.Department for Three-Gorge Survey and Investigation of Yangtze Water Conservancy Committee,Yichang,Hubei 443003)  
After the research of sedimentology,geomorphology and chronology in the Sanduizi-Wudongde reach,we come to the conclusion that the geomorphic feature of the lower reaches of the Jinsha River was formed in the late middle Pleistocene.The ancient Jinsha River was jammed in Jingpingzi and it turned into a local base level of stream,which influences the incision rate along the Sanduizi-Wudongde reach of the Jinsha River.The average incision rate of Jinpingzi,Aoga,Longjie and Yuzha are 196-217 cm/ka,145-172 cm/ka,257-305 cm/ka,82-97 cm/ka respectively.Because of the tectonic knickpoints and lithology knickpoints of the Jinsha River and the distinctions of the fluvial characters,there are some differences in the valley geomorphic feature and the TL datings of the terraces between Aoga reach and Yuzha reach,so the analysis of the terraces height relative to the Jinsha River do not make out.The Sanduizi-Wudongde reach of the Jinsha River contain many kinds of heavy minerals,such as magnetite,russet iron ore,epidote,garnet,and contain many steady minerals and degenerative heavy minerals,for example zircon,rutile,white-titanium,crossed-stone,cyanite,and so on.
【Fund】: 高校博士点基金(200202084004);; 长江水利委员会三峡勘测研究院资助
【CateGory Index】: P931.1
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