新疆北天山晚古生代蛇绿混杂岩带的变形研究

DEFORMATION OF OPHIOLITIC MELANGE OF LATE PALAEOZOIC IN NORTH TIANSHAN OF XINJIANG

运用有限应变测量、磁组构和岩石组构等方法，对北天山存在着的一条晚古生代蛇绿混杂岩带进行了详细的构造变形研究。各种方法的研究结果互相吻合，与野外实际地质现象也相一致。混杂岩带属压扁变形，压缩量５１％，应变强度０．８３．３个主应变轴的平均产状分别是Ｘ＝１２６°∠４４°，Ｙ＝２５７°∠３３°，Ｚ＝８°∠２５°。文中最后讨论了该混杂岩带的形成机制、时代、运动学和动力学特征。

Modern methods of limited strain survey, magnetic fabric and lithologic fabric are applied to study in detail structural deformation of ophiolitic melange of Lgte Palaeozoic in North Tianshan. The research results are similar for all methods and field geological phenomenal Ophiolitic mdlange belongs to flaser deformation which owns 51 % of compression ed strain intensity of 0. 83. The occurence mode of three mahjor strain axes in average are X=126°∠44°,Y=257°∠33°and Z=8°∠25°. The formation. mechanixm, age,kinematics and dynamics are discussed of the ophiolitic zone.