Ductile shear zone of changed shear sense:EBSD characteristics and kinematics of ductile shear zone from 2010 to 2145m of the main borehole in Chinese Continental Scientific Drilling(CCSD).

There is a ductile shear zone(2010～2145m)between eclogite unit(depth 1596～2038m)and gneiss unit(depth 2038～2500m)in main borehole of Chinese Continental Scientific Drilling(CCSD)located in southern part of SuLu ultra-highpressure metamorphic terrane.Ductile shear zone is composed of strong deformational rocks of mylonitic retrograde metamorphic eclogite, granitic mylonite et al.,foliation of ductile shear zone dip to SEE,dip angle changes from average 52°in upper part to 32°in middle and lower part.Attitude of stretching lineation is basic identical with dip of foliation,ductile shear zone resulted from exhumed deformations in 220～200Ma.Microstructure and lattice-preferred orientations of quartzs from mylonitic retrograde metamorphic eclogite and granitic mylonite indicate that exhumed early stage have a SEE-NWW thrust shear sense and exhumed later stage have a NWW-SEE normal-slip shear sense.Forming of ductile shear zone(2010～2145m)in main borehole from CCSD is related with site of ductile shear zone(2010～2145m)which locate in boundary between eclogite unit and gneiss unit.Attitude of foliation,stretching lineation of the first stage N-S direction ductile shear deformation in ultra-highpressure stage is different from the second,the third stage SEE-NWW direction exhumed deformation.