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Sedimentary environment and tectonic significance of the Dacaotan Group of the Western Qinling Mountains

YAN Zhen 1,2 WANG ZongQi 2 WANG Tao 2 YAN Quanren 2 (1.Institute of Geology and Geophysics,Chinese Academy of Science,Beijing10029,China;2.Institute of Geology,Chinese Academy of Geological Science,Beijing100037,China)  
The Upper Devonian Dacaotan and Tieshan groups are composed of nonmarine clastic rocks and littoral turbidite in the western Qinling Mountains.Their sedimentary facies,sequences,detrital composition and paleocurrents indicate that the Dacaotan and Tieshan groups in an alluvial fan and littoral turbidity fan,respevtively.Volcanic rocks of the Liziyuan Group originated from an island arc.They are main sedimenta-ry source of the Dacaotan Group,and also the basement of the Late Dvonian sedimentary basin.On that basin,and on account of the characteristics of the structural deformation and the contact of the Dacaotan Group with its basement,the authors propose that the Dacaotan Group is the depositional fills of a thrust sheet-top basin formed during the Late Palaeozoic forearc accretion,rather than the direct products of Ear-ly Palaeozoic orogeny in the Qinling.According to regional data,the Dacaotan Group can be compared with the Middle-Upper Devonian Shaliushui and Xueshan groups of the Qinling mountains,and to the east and south it may correspond to the contemporaneous Upper Devonian Tongyusi Formation and Tieshan Group of different facies.This shows a tectonic migration from north to south and from west to east.
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