关于上海地区金山群大地构造属性的思考

Thinking of Getotectonic Attribution on Jinshan Group in Shanghai Area

根据上海地区金山群的岩石组合、原岩及原岩建造、变质作用、构造形变特征,以及已有的同位素年龄值,认为金山群与浙东南陈蔡群基本一致,是华厦古陆块的基底组分。参照华厦古板块与扬子古板岩多期聚合的观点,推断分布在(?)径——川沙断裂南东侧的金山群块断体,是晋宁期末二古板块碰撞对接、于结合带内形成的构造推叠岩片。

According to the rock association of Jinshan Group, it＇s protolith, protolith formation, metamorphic process, structural deformation process and existent isotopic age value, the author considers that Jinshan Group could be consistent with ChencaiGroup in south - east part of Zhejiang Province and it is the base component of Cathaysian paleo - plate. As the view of Cathaysian pMeo - plate and converged Yangtze paleo - plate for several times as reference, it could be inferred that the block fault of Jinshan Group which distributed south - east side along Fengjing - Chuansha fault could be the result of collision and impingement of 2 plates in the end of Jinning stage and it also could be structural nappe sheet which formed within integrated assemblage- zone.