丹东韧性剪切带内岩石的有限应变测量及其地质找矿意义  

THE FINITE STRAIN MEASURMENT AND ITS SIGNIFICANCE TO GEOLOGY AND MINERAL RESOURCES REASEARCH IN DANDONG DUCTILE SHEAR ZONE

作　　者：王宇明 

出　　处：《地质找矿论丛》1991年第3期1-12,共12页Contributions to Geology and Mineral Resources Research

摘　　要：丹东韧性剪切带为一狭长的强应变带,大致呈北东—南西向延伸,带内大部分岩石已转化为动态性构造岩,其中发育有变形砾石、扁豆体、构造透镜体、变形捕虏体等,显微镜下可见畸变的石英颗粒及其集合体。这些变形标志体的有限应变测量结果表明,带内岩石在动态变形阶段,曾发生过大规模的、自南东至北西的韧性推覆作用,导致了三股流岩体沿构造薄弱处的侵位及同构造期金矿的形成。The finite strain measurment and analysis in the rock of Dandong Shear Zone indicate that bohprincipal planes and axes of various strain marks are roughly the same in orientation. The plunge ofstreching lineation (x-axis) is consistent with the dip of S-surface in mylonite. The deformation in theshear zone is dominated by the simple shearing with enlongation in the dip of C-surface and the flaten-ing in the opposite dip of C-surface. The shear (r) value increase from NW-SE. The deformation pres-sure is 60-100 Mpa; The temperature, 250--350℃. Evedences mentioned above suggest that SE-NW ductile overthrust in large scale took place duringdynamic deformation which results in the emplacement of Sanguliu Granite Massive along weak beltand the syn-tectonic Au deposits in Dandong shear Zone.

关 键 词：金矿 找矿 岩石 韧性 推覆作用 

分 类 号：P618.510.8[天文地球—矿床学]