鲁南梁丘韧性剪切带基本特征

BASIC CHARACTERISTICS OF THE LIANGQIU DUCTILE SHEAR ZONE IN SOUTHERN SHANDONG

摘要:

梁丘韧性剪切带是发育于鲁南峄山—望母山基底片麻岩穹隆北东侧的区域性构造带,自晚太古代初期奠基至中晚元古代最终形成,至少经历了五次变形变质作用。剪切带从边部到中心,形成初糜棱岩、糜棱岩至超糜棱岩三个基本构造岩带和五一六个亚带。糜棱岩的主要造岩矿物如石英、长石、云母等均发生明显的递进变形变质作用。依据岩石组构特征,文章对主变形期进行应力量及变形参数的初步计算,运用微观和宏观结合的方法分析了应力作用方式和剪切位移量的略算。

Abstract:

The liang qiu ductile shear zong occurs as a regional structural zone in the northeast side of the Yishan-Wangmushan basment-gneiss dome in southern shandong.This shear zone which laid its foundation in the early time of the late Archaean and finally took shape in the middle- late Proterozoic has experienced at least five deformation-metamorphic events.From the margin to the certre of the shear zone there are three principal tectonite zones corresponding to incipient mylonite,mylonite and ultramylonite,resp...