扬子西南缘大红山铁铜多金属矿床交代蚀变岩岩石学及其成矿意义  

Petrology of Metasomatically Altered Rocks from Dahongshan Iron-Copper Polymetallic Deposit in Southwestern Yangtze Massif and Its Significance in Mineralization

作　　者：金廷福 李佑国[2] 罗伟 向贤礼 兰叶芳 孟中能 JIN Tingfu;LI Youguo;LUO Wei;XIANG Xianli;LAN Yefang;MENG Zhongneng(College of Mining Engineering,Guizhou University of EngineeringScience,Bijie,Guizhou 551700,China;College of Earth Sciences,Chengdu University of Technology,Chengdu610059,China;College of Engineering and Technology,Zunyi Normal University,Zunyi,Guizhou 563006,China)

机构地区：[1]贵州工程应用技术学院矿业工程学院,贵州毕节551700 [2]成都理工大学地球科学学院,四川成都610059 [3]遵义师范学院工学院,贵州遵义563006

出　　处：《昆明理工大学学报（自然科学版）》2021年第4期35-51,共17页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：贵州省科技计划项目(黔科合基础[2017]1407);毕节市科学技术联合基金项目(毕科合字[2019]22号);贵州省教育厅青年人才项目(黔教合KY字[2020]100,[2020]146,[2020]147);贵州工程应用技术学院高层次人才科学研究项目(院科合字G2018013号)。

摘　　要：扬子西南缘是我国重要的铁铜金矿产资源产区,分布许多小—大型铁铜多金属矿床,而本次研究的大红山矿床属扬子西南缘内最大的铁铜多金属矿床之一.基于铁、铜矿体的主要赋矿岩石岩石学研究,并结合成矿背景和同位素资料研究,认为其岩性并非火山岩,实际上是由伴随基性岩浆上升的不混溶富硅碱和碳酸盐流体交代混染辉长岩岩体或原地层岩石在大红山岩群某些部位形成的交代蚀变岩(包括蚀变辉长岩).同时,根据矿区观察到的磁铁矿石与钠长石碳酸岩相互穿插、包裹所表现出的不混溶特点,暗示交代蚀变岩形成和铁成矿是同时的,可为下一步在周边寻找铁矿提供新的思路.The southwestern Yantze massif is an important iron-copper polymetallic resources production area in China,and there are many small—large iron-copper polymetallic deposits.The Dahongshan deposit in this study is one of the biggest iron-copper polymetallic deposits in this area.Based on the petrological study of the main ore-bearing rocks of the iron and copper ore bodies,combined with the study of the metallogenic background and isotopic data,it is believed that the lithology is not volcanic,but is actually composed of immiscible rich silica-alkali and Carbonate fluid with the rise of basic magma.The metasomatically altered rocks(including altered gabbro)formed in certain parts of the Dahongshan Group by this fluid metasomatically mixed with gabbro intrusions or in-situ rock.At the same time,the magnetite ore and albite carbonate rock showed immiscibility characteristics in the mining area,because both intersperse and wrap with each other,which suggests that diagenesis and iron mineralization are simultaneous.It provides new ideas for the next step prospecting for iron ore in the surrounding area.

关 键 词：铁铜成矿 岩石学 交代蚀变岩 大红山铁铜多金属矿床 扬子地块西南缘 

分 类 号：P581[天文地球—岩石学]