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《Acta Geoscientica Sinica》 2008-01
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Genesis and Age of the Gravels underlying the Xigeda Formation of Panzhihua,Sichuan,China,and Valley Development of the Ancient Jinsha River

ZHAO Xitao1)HU Daogong2)ZHANG Yongshuang2)1)Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029;2)Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing 100081  
Problems concerning valley development and river capture of the Jinsha River has been studied for one hundred years.Based on lacustrine sediments of the Xigeda Formation and alluvial terrace sediments distributed along the Jinsha River and its tributaries as well as the Dadu River,some researchers proposed that the Jinsha River drainage basin was an inland drainage network formed by a series of fault basins in a period from 3.4 MaB.P.to 2.0 MaB.P.After that,owing to headward erosion of the Yangtze River in Sichuan,an adjustment from the inland drainage system to the external drainage system occurred during 2.0 MaB.P.to 1.54 MaB.P.,and then the Jinsha River upstream of Panzhihua City,Sichuan Province was formed after 1.87 MaB.P.,and the deposition of Xigeda Formation ended.There are three types of sediments along the Jinsha River valley in Panzhihua City.One is the alluvial terrace sediments(there are 11 levels of terraces found in the Panzhihua area)consisting mainly of gravels.The second is lacustrine sand,silts and clays of the Xigeda Formation.The third is gravels with interbedded sand layers buried by the Xigeda Formation.This paper described the sedimentary characteristics of the 50 m thick gravels buried by the lacustrine sediments of the Xigeda Formation and discussed their genesis.The gravels are distributed along the Jinsha River valley and are typically seen in the Dilongqing profile of Bingcaogang,Panzhihua.They were previously recognized to be the Early Pleistocene glacial and fluvioglacial deposits,and the "Jinsha Glaciation" was thus named.The thick gravels with some sand interbedded layers are characterized by good sorting,very high roundness and complicated lithological components of gravel.According to these characteristics,this paper proposes that the gravels are alluvial sediments,mainly river bed sediments,which were transported by the ancient Jinsha River for a long distance.As dating results of the gravels cannot be obtained now,this paper can only refer to the results of the magneto-stratigraphic research of the Sigeda Formation for their accumulation age.The Sigeda Formation was formed in Middle-Late Pliocene or even Early Pleistocene,from 4.2/3.28 MaB.P.to 2.6/2.12/1.78 MaB.P.,so the age of the gravels is inferred to be Early Pliocene,approximately in a period from 4.2 MaB.P.to 4.5/5MaB.P.The discovery of the Early Pliocene alluvial gravels near the Jinsha River valley bottom shows that the Jinsha River channel was near the modern valley bottom in it very early period.This suggests that the Jinsha River has downcut over 2000m from the main planation surface of the Qinghai-Xizang(Tibet)Plateau.This paper proposes that if the capture of the Jinsha River did occur,it could not have happened at the deep incising valley stage.Capture remains therefore must be sought on the main planation surface.
【Fund】: 地质力学研究所基本科研业务费项目(编号:DZLXJK200708);; 中国地质调查局国土资源大调查项目“滇藏铁路沿线地壳稳定性调查评价”(批准号1212010541404)资助
【CateGory Index】: P546;P534.622
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