大别山北麓梅山群中韧性剪切带变形特征及形成机制

梅山群为分布于北淮阳地区位于佛子岭群之下、逆掩于晚泥盆世—石炭纪杨山煤系和中侏罗统红层之上的一套中—浅变质岩系，在其中、上部发育ＮＷ走向的韧性剪切带，产状与区域片理一致。对韧性剪切带及其变形岩石———糜棱岩的宏微观构造研究表明，韧性剪切变形发生于区域变质岩形成之后，具有右旋剪切的运动特点，反映大别山地块向北仰冲过程中所派生的侧向滑移作用

DEFORMATION CHARACTERISTICS AND FORMATION MECH ANISM OF DUCTILE SHEAR ZONE THROUGH THE MEISHAN GROUP AT THE NORTHERN FOOT OF DABIE MOUNTAINS

The Meishan Group, distributed in the northern Huaiyang area, is a suite of middle to low grade metamorphic rocks, which is overlaid by the Fuziling Group and overthrusts the Late Devonian Carboniferous Yangshan coal bearing strata and the Middle Jurassic red beds. An NW trend ductile shear zone with the same occurrence as the regional schistosity developed in the middle to upper part of the Meishan Group. It is revealed, through study on the ductile shear zone and microstructures of the mylonites, that the ductile shear deformation with dextral shearing feature occurred after the formation of the regional metamorphic rocks, which reflects the side sliding derived from the northward overthrusting process of the Dabie Block.