关于上海地区金山群大地构造属性的思考

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。

Thinking of Getotectonic Attribution on Jinshan Group in Shanghai Area

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 paleo - 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.