吉林四平山门银矿区韧性剪切带构造变形特征及研究意义

摘要：通过对吉林四平山门银矿区韧性剪切带的宏观和显微构造变形特征的研究，认识到该剪切带主要由钙质和长英质两类糜棱岩系列岩石组成，具左旋剪切，剪切总位移量约为８３０ｍ，用石英自由位错密度估算出差异应力值为７９．８～１２１．９ＭＰａ。该剪切带的研究加深了对山门银矿成矿作用、成矿条件及成矿规律的认识，对指导找矿具有重要意义。

CHARACTERISTICS AND STUDY SIGNIFICANCE OF STRUCTURAL DEFORMATION IN DUCTILE SHEAR ZONE OF SHANMEN SILVER ORE DISTRICT,SIPING, JILIN PROVINCE

he study results of the structural deformation in the ductile shear zone of Shanmen silver ore district show that there are two different series of mylonitic rocks:calcareous and felsic. The shear zone is a left handed and brittle-ductile transitional one with an amount of shear dislocation of about 830 m, which formed at(155±2) Ma (K-Ar method). The estimated values of ancient differential stress(△δ) are from79.8 MPa to 121.9 MPa. This study is significant to understand the ore-forming regularity and prospect the Shanmen silver ore deposit.