投稿时间：2014-09-29
修订日期：2015-12-21
网络发布日期：2016-02-24
中文摘要:桂花冲铜矿床是铜陵矿集区沙滩脚矿田内新发现的一个以斑岩型矿化 为主的矽卡岩 -斑岩复合型铜矿床。文章对该矿床的矿床地质和斑岩型矿化成矿流体进行了初步研究,旨 在查明该矿床成矿流体的演化过程。根据脉体的穿切关系及矿物共生组合,桂花冲铜矿斑岩 型矿化成矿过程可划分为钾化、硅化、石英黄铁矿、石英多金属硫化物和碳酸盐5个阶段。 硅化阶段主要发育纯气体、含子矿物及富气相包裹体,石英黄铁矿阶段主要发育纯气体、富 液相、富气相及含子矿物包裹体,石英多金属硫化物阶段及碳酸盐阶段主要发育富液相包裹 体。从硅化阶段至碳酸盐阶段,成矿流体由高温(>4729℃)、高盐度(477%～740% )的 岩浆热液逐渐向中低温(1402～2803℃)、低盐度(16%～77%)的岩浆热液和大气 降水 的混合流体演化,成矿过程中流体经历了沸腾及混合作用,混合作用是导致铜沉淀的主要机 制。
Abstract:Located in the Shatanjiao orefield of the Tongling ore concentration area, the G uihuachong copper deposit is a newly-discovered skarn-porphyry composite deposit which is dominated by porphyry mineralization. In this study, the ore deposit g eology and ore-forming fluids of porphyry mineralization were systematically stu died in order to ascertain the fluids evolution. The ore-forming process can be divided into five stages according to the crosscutting relationships of the vein lets and the mineral assemblages as follows: Potassic alteration stage, silicifi cation stage, quartz-pyrite stage, quartz-polymetallic sulfides stage and carbon ation stage. The microscopic observation shows that fluid inclusions are mainly pure gaseous, daughter mineral-bearing, and gas-rich inclusions at the phyllic a lteration stage, pure gaseous, daughter mineral-bearing, gas-rich and liquid-ric h inclusions at the quartz-pyrite stage, and liquid-rich inclusions at the quart z-polymetallic sulfides and carbonate stages. From the silicification stage to t he carbonation stage, ore-forming fluid changed from magmatic water characterize d by high temperature (>4729℃) and high salinity (477%～740%) to the mix tur e of magmatic water and meteoric water characterized by medium-low temperature ( 1402～2803℃) and low salinity (16%～77%); in this process, ore-forming fluid experienced boiling and mixing, resulting in the precipitation of Cu.
文章编号：
中图分类号：P618.41
文献标志码：
基金项目:本文得到中国地质调查局项目(编号: 12120115034401、12120113069900)和国家自然科 学基金项目(编号: 40672045)联合资助
引用文本：
左晓敏,杜杨松,曹毅,岳紫龙,张爱萍,杜静国,黄文明,宋晓媚.2016.安徽桂花冲铜矿床成矿流体演化特征研究[J].矿床地质,35(1):117~129ZUO XiaoMin,DU YangSong,CAO Yi,YUE ZiLong,ZHANG AiPing,DU JingGuo,HUANG WenMing,SONG XiaoMei.2016.Evolution of ore-forming fluids in Guihuachong copper deposit, Anhui Province[J].Mineral Deposits35(1):117~129
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