康定大渡河矿田北缘孔玉金矿区控矿构造特征与成矿动力学环境  

Ore-controlling structure characteristics and metallogenic dynamics environment of Kongyu gold deposit on northern margin of Dadu River orefield in Kangding

作　　者：杨钻云 王元君 宋钰婷 张译文 赵幼琳 YANG ZuanYun;WANG YuanJun;SONG YuTing;ZHANG YiWen;ZHAO YouLin(College of Environmental Science and Engineering,China West Normal University,Nanchong 637009,Sichuan,China)

机构地区：[1]西华师范大学环境科学与工程学院,四川南充637009

出　　处：《矿床地质》2020年第3期511-522,共12页Mineral Deposits

基　　金：西华师范大学博士启动基金项目(编号:412665)资助。

摘　　要：孔玉金矿区地处川滇构造带北缘,是大渡河金矿田的组成部分之一;矿体主要赋存于盖层泥盆系黑色岩系中,已有的年龄数据分别有13.2 Ma、9.55 Ma,代表喜马拉雅期成矿。川滇构造带历经中、新元古代和显生宙2个巨型构造旋回,矿床的形成叠加了被动大陆边缘、活动大陆边缘交替历史条件下岩石圈的伸展、裂陷和收缩、碰撞造山作用,发育大量韧性-脆韧性剪切带构造,成矿地球动力学环境极其复杂。矿床的动力变形样式与构造活动阶段并非同步发育,矿化就位时代滞后于赋矿围岩的剪切变形时代;构造运动控制了元素在地壳中的分布和分配,在含矿岩系中氧化物含量除SiO2、Fe2O3显著偏高外,其他氧化物含量如K2O、CaO、Al2O3、MgO、FeO等均明显偏低,构造地球化学特征表现为富Si、Fe,贫Na、K;依据元素在不同构造类型和单元中分配的规律性,区内成矿有用组分的分散和富集过程可分为矿源层、变质热液初步富集和成矿作用3个阶段。Located on the northern margin of the Sichuan-Yunnan structural belt,the Kongyu gold mining area is one of the components of the Dadu River gold orefield,and the orebodies mainly occur in the black rock series of the Devonian caprock.The ages of the existing data are 13.2 Ma and 9.55 Ma respectively,which represent the Himalayan mineralization.The Sichuan-Yunnan tectonic belt has experienced two giant tectonic cycles of Mesoproterozoic-Neoproterozoic and Phaneroproterozoic.The formation of the deposit experienced superimposition of extension,rifting,contraction and collision orogeny of the lithosphere under the alternating historical conditions of passive continental margin and active continental margin.A large number of ductile-brittle ductile shear zone structures are developed,and the metallogenic geodynamic environment is extremely complex.The dynamic deformation pattern and tectonic activity stage of the deposit were not developed synchronously,and the mineralization age lags behind the shear deformation age of the host rock.Tectonic movement controls the distribution and allocation of elements in the earth's crust,except for SiO2 and Fe2O3 which are obviously high;the values of oxides in the ore-bearing rock series,such as K2O,Al2O3,MgO,CaO and FeO,are obviously low;there exist rich Si and Fe but poor Na,K and some other elements.According to the distribution of elements in different tectonic types and units,the dispersion and enrichment of useful ore-forming components can be divided into three stages:source bed,preliminary enrichment of metamorphic hydrothermal solution and mineralization.

关 键 词：地质学 动力学环境 成矿控矿 构造变形 演化规律 孔玉金矿区 

分 类 号：P618.51[天文地球—矿床学]