大别山杂岩区深层韧性剪切带研究  

STUDY ON DEEP LEVEL DUCTILE SHEAR ZONES IN DABIESHAN METAMORPHIC COMPLEXES

作　　者：张业明[1] 熊成云[1] 韦昌山[1] 

机构地区：[1]宜昌地质矿产研究所,宜昌443003

出　　处：《华南地质与矿产》1998年第3期42-47,共6页Geology and Mineral Resources of South China

摘　　要：大别山杂岩区存在NWW向右行逆冲型和NNE向左行逆冲型深层韧性剪切带,其中发育一套具糜棱岩流变构造（宏观）和片麻岩结构（中粗粒）特征的岩石组合,本文称之为剪切片麻岩。研究认为,NWW向和NNE向深层韧性剪切带组成了近南北向强烈挤压背景下形成的韧性共轭剪切系统,其成因可能与早前寒武纪期间中国统一古陆与Laurentia超大陆相互作用相关。NWW-striking right slip-thrusting and NNE-striking left slip-thrusting type deep level ductile shear zones have discovered in the Dabieshan metamorphic complexes. The rocks in the shear zones, called sheared gneiss by the authors in this paper, are different from mylonites in fabic and gneisses in deformation and are characterized by coarse-grained crystalloblastic textures and strong flowing deformation with flow folds, sheath folds and S-C fabric can be seen. The authors conclude that the deep level shear zones constitute a conjugated shear system resulted from nearly longitudinal compression and that their dynamic genesis might be related to interaction between the all - China oldland and the Laurentia superland during early Precambrian Period.

关 键 词：大别山杂岩 深层韧性剪切带 剪切片麻岩 变形构造 变质作用 成因 

分 类 号：P542.3[天文地球—构造地质学]