摘要
中新元古代随县群分布于秦岭—大别造山带南部，是一套形成于大陆裂谷环境中的砂页岩—流纹英安质火山碎屑岩建造，并在拉张环境中受到了辉长辉绿岩墙侵入．从新元古代末开始经历了多期变质和变形作用改造，记录了华北与扬子两大陆块及其造山作用的复杂演化历史．以现代变质地质学理论为指导，结合岩石学与构造学，宏观与微观研究，确立了随县群的地质事件序列．其主要有３个变形和变质演化阶段：晋宁期伸展滑脱固态流变，低绿片岩相变质；印支期韧性剪切，绿帘—蓝片岩相变质；早燕山期逆冲推覆。
The Tongbai-Dabie mountain chain,the eastern portion of the Qinling-Dabie orogen,is a collisional orogenic belt in Central China that lies between the North China and Yangtze continental plates. The Meso-Neoproterozoic Suixian Group in the south margin of the belt is mainly composed of metamorphosed acidic volcanic rocks,sandy shales and basic dike swarm,devoloped in the active continental margin of the back-arc basin. Eight geological events can be recognized in the group,including three important stages of metamorphism and deformation:the Neoproterozoic(the Jinning stage) solid rheological,rootless intrabedding fold and the low greenschist facies metamorphism;the Late Paleozoic to Triassic(the Early Indosinian stage) ductile shear zone and epidote-blueschist facies metamorphism;the Early Jurassic(the Early Yanshan stage) thrust-nappe,tight isoclinal folds and low greenschist facies metamorphism.
出处
《地球科学（中国地质大学学报）》
EI
CAS
CSCD
北大核心
1996年第3期280-284,共5页
Earth Science-Journal of China University of Geosciences
基金
国家教委博士点基金
国家计委国土司项目
地矿部壳幔演化及动力学开放室验室项目
关键词
造山带
随县群
变质作用
大别地区
桐柏地区
structural analysis, pTtD path,Suixian Group,Tongbai-Dabie orogen.
