东昆仑小南川铜矿床地质特征及成因探讨  

Geological characteristics and genesis of Xiaonanchuan copper deposit in East Kunlun

作　　者：马忠元 李军 马强 张彩霞 MA Zhongyuan;LI Jun;MA Qiang;ZHANG Caixia(The Third Institute of Qinghai Geological Prospecting,Xining 810029,China)

机构地区：[1]青海省第三地质勘查院,青海西宁810029

出　　处：《青海大学学报》2024年第4期101-110,共10页Journal of Qinghai University

基　　金：青海省第三地质勘查院自筹科研基金项目(SKYZC-2022-007);青海省“昆仑英才·高端创新创业人才计划”培养拔尖人才项目。

摘　　要：为研究东昆仑小南川地区铜矿成矿特征,本文在总结小南川铜矿床区域地质、矿区地质和矿床地质的基础上,分析控矿因素并探讨矿床成因。研究表明:小南川铜矿床是受热水喷流沉积和热液叠加改造共同作用形成的热水沉积-层控叠加改造型铜矿;奥陶-志留系纳赤台群哈拉巴依沟组绢云绿泥片岩和钙质长英质千糜岩为小南川铜矿主要赋矿岩石,二者之间的脆韧性剪切带控制着铜矿化带的产出;铜矿体呈层状、似层状和顺层长透镜状、透镜状等形态;矿石矿物主要为孔雀石和铜蓝,少量黄铜矿、辉铜矿、黝铜矿等;矿石化学特征表明该矿床以氧化铜矿石为主,Co为伴生有益元素。该研究结果可为进一步开展区域成矿规律研究和找矿勘查工作提供依据。In order to investigate the mineralization characteristics of Xiaonanchuan copper deposit in East Kunlun,the controlling factors of the deposit are analyzed and its genesis are explored after summarizing the regional geology,mining area geology and deposit geology of the copper deposit.The results show that Xiaonanchuan copper deposit is a hydrothermal sedimentation-stratified superimposed copper deposit formed by hydrothermal jet deposition and hydrothermal superimposed transformation.The main ore-bearing rocks of the copper deposit are sericular-green schist and calcrete felsic chylite of Halabayigou Formation in the Ordovician and Silurian Nachitai Group,and the brittle ductile shear zone between them controls the production of copper mineralization zone.The shapes of the copper deposit are stratiform,quasi-stratiform,long lenticular,lenticular and so on.Ore minerals are mainly malachite and copper blue,with small amounts of chalcopyrite,chalcocite,tetrahedrite,etc.The ore chemical characteristics show that the ore deposit is mainly copper oxide ore,with Co as an associated beneficial element.The results can provide basis for further regional metallogenic regularity and prospecting research.

关 键 词：纳赤台群 热水沉积型 热液改造 小南川矿床 东昆仑 

分 类 号：P618.41[天文地球—矿床学]