安徽省铜陵市迪龙冲金矿床成矿地质特征及找矿标志

Metallogenic geological characteristics and prospecting indicators of Dilongchong Gold Deposit in Tongling City,Anhui Province

铜陵矿集区是长江中下游成矿带的重要成矿区,迪龙冲金矿床位于该矿集区中部,大地构造位置属扬子板块北缘。近年来,在区域内发现了叶山铁矿床、曹家冲铜矿床、舒家店铜矿床及杨冲里金矿床等典型矿床。通过本次野外勘查工作,结合前人已有成果资料,系统总结了迪龙冲金矿床地质特征、成矿要素及找矿标志,为进一步找矿勘探工作提供依据。研究结果表明,迪龙冲金矿床成矿类型主要为裂隙充填型和蚀变岩型2种。矿体(脉)成因是后期热液灌入、充填或交代作用成矿。矿体(脉)严格受构造控制,北东向主构造和北西向次级构造均为容矿构造。坟头组地层、石英闪长斑岩和断裂接触带交会部位及附近是寻找金矿的关键位置。硅化-镜铁矿化-黄铁矿化(褐铁矿化)、镜铁矿化-金矿化、硅化-黄铁矿化和黄铁绢英岩化等4类矿化蚀变组合是矿区及周边地区较为重要的找矿标志。

Tongling Ore Concentration Area in Anhui Province is an important metallogenic area in the Middle-lower Yangtze Reaches Metallogenic Belt.The Dilongchong Gold Deposit is located in the middle of the ore concentration area,with the tectonic position on the northern margin of the Yangtze Plate.In recent years,typical deposits such as Yeshan Iron Deposit,Caojiachong Copper Deposit,Shujiadian Copper Deposit,and Yangchongli Gold Deposit have been discovered in this area.Through this field exploration work,combined with the existing achievements of the predecessors,the geological characteristics,metallogenic elements,and prospecting indicators of the Dilongchong Gold Deposit are systematically summarized,which provides a basis for further prospecting and exploration work.The results show that the metallogenic types of Dilongchong Gold Deposit are mainly fissure filling types and altered rock types.The genesis of the ore body(vein)is considered to be the late hydrothermal infusion,filling,or metasomatism mineralization.The ore bodies(veins)in the area are strictly controlled by the structure,and the NE-trending main structure and the NW-trending secondary structure are both ore-hosting structures.The intersection of the Fentou Formation,quartz diorite porphyry,and fault structure contact zone and its vicinity are key positions for finding gold deposits.The 4 mineralization alteration combinations of silicification-specularite mineralization-pyritization(limonite mineralization),specularite mineralization-gold mineralization,silicitization-pyritization,and beresitization are important prospecting indicators in the mining area and surrounding areas.