安徽宣城茶亭铜金矿区外围找矿潜力分析

Analysis of mineral prospecting potential in the periphery of Chating copper-gold mining area in Xuancheng City of Anhui Province

安徽宣城茶亭铜金矿是皖东南首次发现的大型斑岩型铜金矿。近年来在该地区实施的一系列物探工作以及验证物探异常获得新的找矿成果,区内铜多金属矿与岩浆活动十分密切,中酸性侵入岩能引起地磁异常,碳酸盐岩能引起重力异常,黄铁矿、黄铜矿能引起可控制音频大地电磁(controlled source audio magnetotelluric method,CSAMT)低阻异常,研究发现茶亭斑岩型铜金矿物探异常特征为低磁、高重力场、CSAMT低阻。根据上述综合找矿信息,在茶亭斑岩型铜金矿外围深部找矿中发现了新的含金隐爆角砾岩体以及铅锌矿体,指明了茶亭外围找矿方向,为进一步的找矿突破提供了思路。

The Chating copper-gold deposit in Xuancheng City is the first discovered porphyry type copper-gold deposit in Southeastern Anhui Province.In recent years,some new achievements are got by a series of geophysical survey and verification works of geophysical anomalies.The copper polymetallic deposits in the area are closely related to magmatic activity.The geomagnetic anomalies are caused by intermediate-acid intrusive rocks,and gravity anomalies are caused by carbonate rocks.Besides,the low resistivity anomalies in CSAMT are caused by pyrite and chalcopyrite.The Chating copper-gold deposit are characterized by low magnetic,high gravity and low resistivity in CSAMT.The new gold-bearing cryptoexplosive breccia and lead-zinc ore bodies have been found in the deep prospecting in the periphery of Chating copper-gold mining area,based on the above comprehensive prospecting informations,which indicates the prospecting direction and provide further prospecting breakthrough idea in the periphery of Chating copper-gold mining area.