辽宁青城子逆冲推覆构造变形与金矿控矿作用探讨

青城子矿田位于辽吉裂谷中部,中朝准地台胶辽台隆营口—宽甸台拱北翼,经受了多期构造运动。自20世纪以来青城子矿区先后发现了白云、高家堡子等10多处金矿床,是国内比较知名的金矿田,然而关于该金矿的成因到目前仍然是很多学者争论的焦点。为了确定推覆构造与控矿作用的关系,从推覆构造变形的角度对金矿成因加以探讨。根据金矿的形态、与推覆构造变形的关系和与岩浆热液蚀变的关系,构建了韧性变形—热液改造成矿模式,且把金矿的成矿类型分为2类:(1)发育于剪切带中,受剪切变形和热液叠加改造综合作用的矿床;(2)发育于次级断层交会处或地层接触带,受断层和热液控制的矿床。

Discussion on the Thrust Nappe Structure Deformation of Qingchengzi and Gold Ore-controlling,Liaoning Province

Qingchengzi ore field is located at middle of Liaoning-Jilin rift,northern of China-Korean platform Yingkou-Kuandian uplift,experienced multiphase tectonic movement.Since the 20 century,Qingchengzi ore field have been found more than ten gold deposits,such as Baiyun,Gaojiabaozi,it is one of the most well-known domestic gold field.But the genesis of Qingchengzi gold deposit is also the focus of many scholars’debate.In order to define the relation between the nappe structure and the ore-controlling,the genesis of gold deposit was duscussed with the angle of nappe structure deformation.According to the occurrence of gold deposit and the relationship with nappe structure deformation and with magmatic hydrothermal alteration,the ductile shearing deformation-hydrothermal reformation metallogenic model was build,and the gold deposit mineralization types are divided into two categories:(1)developed in the shear zone,controlled by shear deformation and hydrothermal alteration superimposed combination types of deposits;(2)developed in the secondary faults interchange or formation contact zone,controlled by faults and hydrothermal deposit.