【摘要】 通过建瓯地区1∶5万区域地质调查及专题研究,发现前人所划分的新元古代马面山群实为一套俯冲增生杂岩体系,由基质和各类岩块组成。根据各类岩石变质变形、相互关系等宏观地质特征,结合同位素测年、微古化石综合分析及各类岩石化学特征,基本确定该套俯冲增生杂岩形成于新元古代-早古生代,各类岩块形成于不同构造环境,同时对混杂岩的演化过程及洋陆转换机制进行分析探讨。更多还原

【Abstract】 Based on the 1∶50000 regional geological survey and special research in Jianou area,it is found that the Mamianshan Group of the Neoproterozoic is a subduction and accretive complex system,which is composed of matrix and various rock blocks.According to the macroscopic geological characteristics such as metamorphic deformation and interrelation of various rocks,combined with isotopic dating,comprehensive analysis of micropaleozoic fossils and various petrochemical characteristics,it is basically determined that the subducted accretive complex was formed in Neoproterozoic and early Paleozoic.Various rock blocks formed in different tectonic environments.The evolution process of melange and the mechanism of ocean-land transition are discussed.更多还原