[an error occurred while processing this directive] 高校地质学报 2003, 9(4) 678-690 DOI:     ISSN: 1006-7493 CN: 32-1440/P

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陆建军
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安徽铜陵冬瓜山铜、金矿床两阶段成矿模式
陆建军, 华仁民, 徐兆文, 高剑峰, 李娟
南京大学地球科学系,成矿作用国家重点实验室,南京 210093
摘要: 冬瓜山铜金矿床包括层状硫化物矿体、矽卡岩型和斑岩型矿体。层状硫化物矿体具层状形态和层控特征,矿石具块状、层纹状和揉皱状构造。燕山期岩浆岩及其岩浆流体对层状矿体进行了叠加和改造,改变了其结构构造、矿物组合和矿石成分,并在其上叠加蚀变和矿化。层状矿体中的铜是由含铜流体交代块状硫化物矿石形成的。冬瓜山铜金矿床经历了两次成矿作用:第一成矿阶段.在石炭纪中期,海底喷流作用形成了块状硫化物矿床,矿石成分以硫、铁矿为主;第二成矿阶段。燕山期岩浆侵人,一方面岩浆热液与围岩相互作用发生矽卡岩化、硅化、钾长石化、石英绢云母化和青磐岩化,形成矽卡岩型和斑岩型矿体,另一方面岩浆流体对块状硫化物矿体进行叠加改造,致使块状硫化物矿体富集铜等成矿物质。
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A Two-Stage Model for Formation of the Dongguashan Cu-Au Deposit
LU Jian-jun, HUA Ren-min, XU Zhao-wen, GAO Jian-feng, LI Juan
State Key Lab. For Mineral Deposits Research, Nanjing University, Nanjing 210093, China
Abstract: The Dongguashan Cu-Au deposit includes stratiform sulphide orebodies,and skarn and porphyry type orebodies.The stratiform orebodies occur between the Late Devonian sandstones and the Middle to Late Carboniferous carbonates.Detailed field and laboratory investigations revealed that these stratabound orebodies are massive sulphide deposit.The Late Juarassic magmatic rocks were brought to be in contact with the masive sulphide orebodies and caused them to be transformed and hydrothermally superimposed.The copper-bearing magmatic fluids replaced massive sulphides ores and formed chalcopyrite in them .A two-stage model for the formation of the Dongguashan deposit can be established .In the first ore-forming stage during the Middle Carboniferous period ,submarine exhalation sedimentation caused the formation of massive sulphide orebodies which contain dominantly pyrite,pyrrhotite,and some gangue minerals,but little copper-bearing sulphides.In the second stage at the Late Jurassic,magmatic hydrothermal fluids,on the one hand,formed the skarn and porphyry type of ore bodies ,on the other hand,overprinted the earlier massive sulphide orebodies ,and induced enrichment of large amounts of copper in the stratiform sulphide ores .
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收稿日期 2003-12-20 修回日期 2003-12-20 网络版发布日期  
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