论云南个旧锡铜钨三稀金属矿集区叠加成矿系统与垂向构造岩相学结构的关系  

On relationship between the superimposed mineralization systems and the zoning patterns of vertical tectonic lithofacies in the Gejiu concentration area of Sn-Cu-W and three rare metals in Yunnan

作　　者：方维萱[1] 郭玉乾[1] 贾润幸[1] 童祥 马振飞 FANG Weixuan;GUO Yuqian;JIA Runxing;TONG Xiang;MA Zhenfei(Innovation Laboratory of Mine,Environment and Mineral,China Non-Ferrous Metals Resource Geological Survey,Beijing 100012,China;Yunnan Tin Group(Holding)Company Limited,Gejiu 661000,Yunnan,China)

机构地区：[1]有色金属矿产地质调查中心矿山生态环境资源创新实验室,北京100012 [2]云南锡业集团(控股)有限责任公司,云南个旧661000

出　　处：《地质力学学报》2021年第4期557-584,共28页Journal of Geomechanics

基　　金：科技部转制科研院所专项资金项目(2008EG115074);云南省省院省校科技合作项目(2000YK-05);全国危机矿山接替资源勘查项目(〔2005〕027);公益性行业科研专项项目(201511016-1);云南锡业股份有限公司科研项目(LC-ZGB-2021007)。

摘　　要：采用构造岩相学分带和变形筛分、宏观与微观构造岩相学研究相结合的方法,对云南个旧矿集区构造和叠加成矿系统进行研究,深入揭示了该矿集区内锡铜钨钴铯铷多金属战略矿产富集机制、叠加成矿作用与构造岩相学结构样式之间的内在关系。研究认为,该区发育前岩浆侵入期三叠纪弧后裂谷盆地、同岩浆侵入期岩浆侵入构造系统和构造样式、后岩浆侵入期岩溶构造样式,它们在不同时间域内发生了异时同位叠加成相成矿与同时异相分异作用,对个旧叠加成矿系统和锡铜钨钴铯铷多金属成矿作用具有显著不同的控制作用。锡铜钨铯铷多金属叠加成矿系统具有9个垂向构造岩相分带结构样式,从深到浅依次为:浅色花岗岩相(VTZ8)和岩浆气成热液结晶核相(VTZ9)为黑云母花岗岩(γK2a-b-c)同岩浆侵入期构造岩相带,分布在花岗岩侵入体顶部和边部;岩浆接触交代构造岩相带矽卡岩化相-矽卡岩相带(VTZ7),是同岩浆侵入期地层-岩浆系统耦合反应的构造岩相带;富含残余岩浆的高温气液体系发生了岩浆-气液隐爆角砾岩化,形成进入个旧组内岩浆热流柱构造和电气石热液隐爆角砾岩相带(VTZ6);同岩浆侵入期在个旧组内构造-流体耦合作用,形成了上覆断褶式碳酸盐岩层(VTZ4)和碎裂岩化大理岩化相-电气石碎裂岩化大理岩相带(VTZ5)、远端的似层状碎裂岩化相含锡白云岩(VTZ3);三叠纪弧后裂谷盆地内碱性苦橄岩-碱性火山岩相带和火山喷发机构为前岩浆侵入期构造;云贵高原侵蚀面(VTZ1)和表生岩溶构造系统(VTZ2)为后岩浆侵入构造系统,它们叠加在同岩浆侵入构造系统(VTZ3、VTZ4、VTZ5、VTZ6、VTZ7、VTZ8、VTZ9)之中。这些新成果为该矿集区深部探测和隐伏构造岩相的预测建模提供了新的理论依据。Based on the zoning pattern and the deformation sieving of tectonic lithofacies,as well as the macroscopic and microscopic studies of tectonic lithofacies,the superimposed mineralization systems and the Gejiu ore-concentrated area in Yunnan has been studied.The relationship among the enrichment mechanism of strategic key minerals,the superimposed mineralization,and the pattern of tectonic lithofacies has been uncovered.It was believed that the Triassic arc-back rift basin at the pre-magmatic intrusive stage,the tectonic system of magmatic intrusion at the syn-magmatic intrusive stage,and the karstic tectonic system at the post-magmatic intrusive stage,all of them are of syn-space superimposing lithofacies and mineralizations within different time domains and syn-time lithofacies differentiation.All of them had different controls on the Gejiu superimposed mineral system and Sn-Cu-W-Co-Cs-Rb mineralization.There are 9 vertical tectonic lithofacies zones(VTZs)in different patterns of VTZs around the Gejiu superimposed mineralization system.Firstly,the light-colored granite(VTZ8)and crystal-nucleus lithofacies of magmatic pneumatolytic hydrotherm(VTZ9),being the tectonic lithofacies of syn-magmatic intrusive stage for the biotite granite(γK2a-b-c),was formed at the top and on the edges of the granite intrusion.Secondly,skarn alteration lithofacies to skarn lithofacies(VTZ7)in the magma-contact metasomatic tectonic lithofacies zone is the tectonic lithofacies zone for coupling reaction by the strata and the magmatic system at the syn-magmatic intrusion.Thirdly,on the one hand,cryptoexplosive brecciation of magmatic pneumatolytic hydrotherm enriching in residual magma was forced into the Middle Triassic Gejiu Group,resulted in the magmatic hydrothermal plume and lithofacies zones of tourmaline-hydrothermal cryptoexplosive breccias(VTZ6).On the other hand,the upper part of the fault-fold-type carbonate layer(VTZ4),the marble lithofacies with cataclastic facies and the cataclastic tourmaline-marble lithofacies(VTZ5),and

关 键 词：叠加成矿系统 构造岩相分带 同岩浆侵入期 碱性岩浆 战略关键矿产 铜锡钨钴 

分 类 号：P586[天文地球—岩石学]