吴川-四会断裂带大王山花岗岩早期韧性变形特征  

STRUCTURAL CHARACTERISTICS OF EARLY-FORMED DUCTILE DEFORMATION OF DAWANGSHAN GRANITOID IN THE WUCHUAN-SIHUI FAULT ZONE

作　　者：周永生[1] 何绍勋[2] 

机构地区：[1]桂林冶金地质学院 [2]中南工业大学

出　　处：《桂林冶金地质学院学报》1989年第2期161-166,共6页

摘　　要：大王山剪切带内出现一系列规模不等的糜棱岩条带,广泛发育S面理和C面理,还出现一系列次级拉伸折劈理、剪切条带和不对称小褶纹。剪切带中的石英、云母等基质矿物以塑性变形为主,出现动态重结晶、亚晶、波状消光等显微构造。长石主要以破裂和香肠化为主,出现粒内的张裂隙和肿缩构造。石英和长石存在明显的流变学差异。通过构造和显微构造特征判定,大王山剪切带为右旋剪切带。吴川-四会断裂曾经历过右旋韧性剪切作用。A series of mylonite bands, S-cleavages, C-cleavages, secondary ex-tensional crenulation cleavages, shear bands and minor asymmetric foldsare developed in the Dawangshan shear zone where quartz, mica andother matrix minerals mainly suffered plastic deformation and micro-structures such as dynamic recrystallization. subgrain, wave extinctionetc. were formed. Feldspar mainly experienced brittle deformation. Frac-tures, boudinages, pinch-and-swell structures etc. were formed. It isobvious that there was flow difference between quartz and feldspar.Observed and measured structures and microstructures suggest thatthe Dawangshan shear zone is a dextral or clockwise and the Wuchuan-Sihui fault zone underwent dextral ductile deformation.

关 键 词：断裂带 剪切带 花岗岩 岩组学 广东 韧性变形作用 剪切作用 

分 类 号：P542.3[天文地球—构造地质学] P588.121[天文地球—地质学]