摘要
金平龙脖河铜矿位于哀牢山—金沙江构造带的东南端。赋矿围岩为变钠质火山岩,成矿主要类型为构造破碎蚀变岩型铜矿;围岩蚀变以绿泥石化、碳酸盐化、硅化、磁铁矿化等为主。通过对产于变钠质火山岩中不同蚀变程度和矿化程度岩、矿石的地球化学组分进行对比,计算不同岩、矿石体积的变化和组分的迁移。计算结果表明:从弱矿化变钠质火山岩到强矿化变钠质火山岩,随蚀变和矿化的增强,岩石体积分别扩容了14%、12%;组分Si O2、HREE及成矿物质Cu和S等的含量具有逐渐增加的趋势,微量元素中亲铁元素Cr、Ni也有不同程度的迁入富集;而组分CaO、MnO和LREE等的含量则逐渐降低,说明成矿过程中Si O2、HREE及成矿物质Cu和S等是由流体带入的,而CaO、MnO和LREE等则是由流体从围岩中带出的,以及成矿物质主要来源于深部流体。
Longbohe copper deposit,a structure fractured altered-rock type of copper deposit,is located in the southeast end of Ailaoshan-Red River tectonic zone,Jinping,Yunnan.The wallrock is sodium-enriched metavolcanic rock,and the alteration consists of chloritization,silicification,pyritization,and sericitization.The voluminal change and compositional migration between metavolcanic rock and mineralizational metavolcanic rocks are calculated based on the geochemical compositions.The results show that,from weakly mineralized metavolcanic rocks to strong mineralized metavolcanic rocks,the volumes increase by about 14% and 12%,respectively,and the contents of SiO2,HREE,metallogenic elements（Cu and S）,and pro-iron elements such as Cr and Ni increase gradually,but the contents of CaO,MnO,LREE,etc.,decrease gradually.It suggests that the SiO2,HREE and metallogenic materials,such as Cu,S,etc.,are moved into the wallrock by the ore-bearing fluid,and the CaO,MnO,LREE,etc.are moved out from the wallrock,and the metallogenic materials come mainly from the magmatic hydrothermal.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2011年第3期250-260,共11页
Earth Science Frontiers
基金
中国地质调查局项目(1212010918009)
科学技术部深部探测技术与实验研究专项(SinoProbe-05-03)
关键词
云南金平
龙脖河铜矿
变钠质火山岩
组分迁移
成矿作用
Jinping of Yunnan
Longbohe copper deposit
sodium-enriched metavolcanic rocks
compositional migration
mineralization
