摘要
科克萨依金矿床为典型的韧性剪切带蚀变糜棱岩型金矿床，它与克孜勒它乌推覆构造系统有着十分密切的内在成因联系，其变形作用以韧性变形为主，具典型的深层次变形构造组合特点，其成矿过程可划分为３个重要的构造演化阶段，即早期的剪切片理化阶段、中期的变形分解阶段和晚期的液压致裂阶段，从而建立了该剪切带金矿床的构造演化模式。早期的剪切片理化阶段仅具微弱的金矿化；中期变形分解过程中，含金流体的渗流导致水热蚀变和金在递进缩短应变域的大规模沉淀，形成了主成矿期的金矿化；在晚期液压致裂阶段，含金流体涌入张裂隙，形成高品位、小规模的含金石英脉。
The Keksayi gold deposit is a typical altered mylonite type gold deposit in the ductile shear zone, which is in close genetic connection with the Keziletawu nappe tectonic system.Dominated by ductile deformation,its deformation is characterized by the combination of deep level deformation structures.The ore forming process might be divided into three important structural evolutionary stages,viz.,the early shearing schistositization stage,the middle deformation decomposition stage and the late water pressure induced fracturing stage.On such a basis,a structural evolutionary model for this shear zone gold deposit has been established.Merely weak gold mineralization occurred at the early shearing schistositization stage;in the deformation decomposition process of the middle stage,the percolation of auriferous fluids led to the hydrothermal alteration and the precipitation of large quantities of gold in the progressively shortened strain domain,causing gold mineralization of the principal ore forming stage;at the late water pressure induced fracturing stage,auriferous fluids gushed into tension fissures and formed high grade small sized auriferous quartz veins.
出处
《矿床地质》
CAS
CSCD
北大核心
1998年第4期314-320,共7页
Mineral Deposits
基金
中国有色金属工业总公司地质勘查总局二级课题
关键词
韧性剪切带
构造演化模式
金矿床
地质构造
ductile shear zone, structural evolutionary model, Keksayi in Xinjiang
