安徽铜陵桂花冲铜金矿床的成矿条件与找矿潜力  

Metallogenic conditions and prospecting potential of Guihuachong copper-gold deposit in Tongling,Anhui Province

作　　者：刘军 周涛发[1,2] 范裕 陈静[1,2] 熊燕云 刘杰添[1,2] LIU Jun;ZHOU Taofa;FAN Yu;CHEN Jing;XIONG Yanyun;LIU Jietian(School of Resources and Environmental Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Province Engineering Research Center for Mineral Resources and Mine Environments,Hefei 230009,China)

机构地区：[1]合肥工业大学资源与环境工程学院,安徽合肥230009 [2]安徽省矿产资源与矿山环境工程技术研究中心,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2024年第8期1068-1079,共12页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(91962218)。

摘　　要：桂花冲矿床位于铜陵矿集区和繁昌火山岩盆地之间的过渡区,是长江中下游成矿带中新类型的铜金多金属矿床。矿体主要呈透镜状、脉状,分别赋存于桂山岩体与三叠系南陵湖组灰岩地层的接触带和远端碳酸盐地层裂隙中。文章通过记录野外地质工作及全岩地球化学特征,开展锆石U-Pb定年研究,发现矿区内青山岩体(花岗闪长斑岩)是成矿前岩体,桂山岩体(石英二长斑岩)是成矿岩体。对比铜陵—繁昌过渡区内姚家岭大型矿床研究发现,青山岩体与姚家岭早期岩体形成时代在140 Ma左右,青山岩体可能为姚家岭早期岩体延伸至桂花冲区域,后被推覆至地表;桂山岩体与姚家岭晚期岩体为成矿岩体,形成时代在138 Ma左右,两者可能在深部相连,是同一岩体的不同岩枝。综合桂花冲矿床控矿因素和成矿条件分析,探究该类矿床的成矿潜力和勘探方向,分析表明,在铜陵—繁昌过渡区的碳酸盐地层层间裂隙、褶皱滑脱区域、地层岩性显著变化位置以及形成时代在138 Ma左右的石英二长斑岩与黄龙组、栖霞组、孤峰组、大隆组、南陵湖组碳酸盐地层的接触带具有较好的找矿潜力。Guihuachong deposit is located in the transition area between Tongling ore concentration and Fanchang volcanic rock basin.Guihuachong deposit is a new type of copper-gold polymetallic deposit in the middle-lower Yangtze River Valley metallogenic belt.The orebodies are mainly lens-like and vein-like and occur in the contact zone between the Guishan rock mass and the limestone strata of the Triassic Nanlinghu Formation and in the fractures of the distal carbonate strata.By recording the field geological work and geochemical characteristics of the whole rock in detail,this paper carries out the zircon U-Pb dating.It is found that Qingshan pluton(granodiorite porphyry) is the pre-metallogenic pluton,and Guishan pluton(quartz monzonite porphyry) is the ore-forming pluton.It is found that Qingshan pluton and early Yaojialing pluton were formed around 140 Ma in Tongling-Fanchang transition zone,and Qingshan pluton may have been extended from early Yaojialing pluton to the Guihuachong area and then pushed to the surface.The late Guishan pluton and Yaojialing pluton are ore-forming pluton with a formation age of about 138 Ma.They may be connected in depth and are different branches of the same pluton.Based on the analysis of ore-controlling factors and ore-forming conditions,the metallogenic potential and exploration direction of Guihuachong deposit are explored.The analysis shows that in the Tongling-Fanchang transition area,the fractures between carbonate strata,the fold slippage area,the location with significant changes in stratigraphic lithology,the quartz monzonite porphyry and Huanglong Formation with a formation age of about 138 Ma,and the contact zone of carbonate strata in Qixia Formation,Gufeng Formation,Dalong Formation and Nanlinghu Formation have good prospecting potential.

关 键 词：锆石U-PB定年 地球化学 桂花冲矿床 铜陵—繁昌过渡区 青山岩体 桂山岩体 

分 类 号：P612[天文地球—矿床学]