江绍断裂带的构造演化初探

Initial Discussion on the Tectonic Evolutionof Jiangshan-Shaoxing Fault Zone

由于对江绍断裂带两侧前寒武纪地质认识的差异 ,特别是对浙东南陈蔡群、八都群变质岩时代、大地构造属性、构造演化等问题各家有不同看法 ,对江绍断裂带形成时代及其构造演化认识也不尽一致。文章对新元古代形成的作为江南古岛弧与华夏地块碰撞造山地缝合带的江绍断裂 ,在显生宙经历的多次构造变动演化进行探讨 ,提出碰撞拼接实现于距今8亿年前后 ,加里东、印支 ,特别是燕山期 ,经历了强烈的构造———岩浆变动 ,至车免近期尚有活动。

Because of different thoughts to the precambrian geology of both sides of Jiangshan-shaoxing fault zone,especially the different opinions on the forming time,geotectonic features and tectonic evolution of the metamorphic rocks or Chencai group and Badu group in southeastern Zhejiang ,geologrcal experts had different opinions on the forming time and tectonic evolutron of Jiangshan-Shaoxing fault zone.This paper discussed on the multiple tectonic evolutions of Jiangshan-shaoxing fault zone in phanerozoic eon,which was an orogenic suture zone formed by the collision between Jiangnan old island-arc and Huaxia land mass.It put forward that the collision and matching occurred 800 million years ago,and strong tectonomagmatic movements occurred in Caledonian, Indo-sinian and Yanshanian periods.There were still activifies in late periods.