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Multiple Superposition Ductile Shear Zone in Hushan Region,Southern Edge of Su-lu Orogenic Belt

PAN Ming-bao1 2, CHEN Huo-gen2, XIE Guo-ai1, ZHANG Qing-long1, LU Hua-fu1, CHEN Shou-ju2   

  1. 1. Department of Earth Sciences, Nanjing University, Nanjing 210093, China; 2. Jiangsu Institute of Geological Survey, Nanjing 210018, China
  • Received:2004-03-20 Revised:2004-03-20 Online:2004-03-20 Published:2004-03-20

Abstract: Multiple superposition ductile shear zone,where multiple ductile movements activated entirely or nearly in same shear zone,is a common feature in gneiss complex of the Precambrian orogenic belts.Based on the studies of deformation mechanisms,dynamic properties and deformed metamorphic mineral generations,and to analyse the regional structural sequence and build a regional scheme of events correctly,we investigated the multiple superposition ductile shear zone in Hushan area,Donghai county,Jiangsu Province.The results suggest that there are three generations of ductile shear activities. The first is detachment movement with feldspar stretching lineationes in felsic mylonites an domphacite-garnet differentiation layers in deformed eclogites.Th e second is ductile thrust movement with kyanite and muscovite(partly 3-T phengite)and zoisite stretching lineations and garnet ougens in eclogite mylonites.The third is semibritfle thrust movement with s-c foliations and quartz ribbons in felsic s-c mylonites.