青海南山赛日钦地区逆冲推覆构造特征及演化

摘要

Thrust Nappe Structure is in the south slope of Nanshan in Qinghai.This is the newly discovered tectonic style in the Sairiqin area.The reverse thrust nappe structure is located in the area of the north and south of the region.It is located in the area of Saiyenchin area.The section is characterized by the single-thrust imbricate structure formed in the plough thrust fault.According to the characteristics of rock assemblage and metamorphic metamorphism in the nappe,two tectonic zones were divided.The thrust direction is generally from north east to south west.The migration distance is greater than 4 km,which is formed in the early early Triassic in late Permian.In a systematic study,we have known of chin thrust nappe tectonic characteristics on the basis of preliminary discussion.The process of generation and evolution for the research of Qinghai in Indosinian period can provide certain geological tectonic evolution.%赛日钦逆冲推覆构造发育在青海南山南坡,是赛日钦地区新发现的构造样式.逆冲推覆构造在空间上呈一近南北向的倒三角式分布于赛日钦一带,剖面上表现为犁式逆冲断裂所构成的单冲式叠瓦状构造.按推覆体中岩石组合和变形变质特征的不同初步划分了2条构造分带.推覆方向总体由北东向南西,运移距离大于4 km,形成于晚二叠世末期一早三叠世早期.在较为系统研究赛日钦逆冲推覆构造特征的基础上,初步探讨其生成演化的过程,为研究青海南山在印支期的构造演化提供一定的地质依据.