长江中下游抛刀岭大型中硫型浅成低温热液金矿床的厘定及其找矿启示  

Identification of Paodaoling large intermediate-sulfidation epithermal gold deposit in Middle-Lower Yangtze River Valley metallogenic belt and its implication for mineral exploration

作　　者：黄柯 谢桂青[1,2] 段留安 安文武 HUANG Ke;XIE GuiQing;DUAN LiuAn;AN WenWu(MNR Key Laboratory for Exploration Theory&Technology of Critical Mineral Resources,China University of Geosciences,Beijing 100083,China;MNR Key Laboratory ofMetallogeny andMineralAssessment,Institute ofMineral Resources,Chinese Academy of Geological Sciences,Beijing 100037,China;Yantai Geological Survey Center of Coastal Zone,China Geological Survey,Yantai 264004,Shandong,China;School of Earth Resources,China University of Geosciences,Wuhan 430074,Hubei,China)

机构地区：[1]中国地质大学自然资源部战略性金属矿产找矿理论与技术重点实验室,北京100083 [2]中国地质科学院矿产资源研究所自然资源部成矿作用与资源评价重点实验室,北京100037 [3]中国地质调查局烟台海岸带地质调查中心,山东烟台264004 [4]中国地质大学资源学院,湖北武汉430074

出　　处：《矿床地质》2022年第2期440-448,共9页Mineral Deposits

基　　金：国家自然科学基金项目(编号:41925011)资助。

摘　　要：长江中下游是全球重要的斑岩-矽卡岩铜多金属矿床成矿带之一,近年来识别出一些大型明矾石矿床、中小规模高硫型和低硫型金±银矿床,但是否存在中硫型矿化蚀变系统还不清楚。抛刀岭是近年来在长江中下游成矿带新发现的大型独立金矿床,文章通过岩芯编录、短波红外光谱和矿物成分的研究,厘定该矿床矿体主要产于~140 Ma英安斑岩脉中,成矿蚀变以面状伊利石-白云母化为主,矿石主要为充填型脉状、网脉状构造,局部具有胶状、皮壳状和晶簇状等低温结构,发育黄铁矿-车轮矿-硫砷铅铜矿-低铁闪锌矿-富锰碳酸盐矿物组合。这些特征类似于中硫型浅成低温热液金矿床,该类型在长江中下游尚属首例,暗示长江中下游成矿带具有寻找中硫型浅成低温热液矿床的潜力。The Middle-Lower Yangtze River Valley metallogenic belt is one of the important areas with enormous porphyry-skarn copper-polymetallic deposits in the world.In recent years,large-sized alunite deposits,medium-and small-sized high-and low-sulfidation epithermal Au±Ag deposits have been identified.It is unclear whether there is intermediate-sulfidation mineralization and alteration system until now.The Paodaoling is a large gold-only deposit recently discovered in this metallogenic belt.By core logging,shortwave infrared reflectance spectroscopy and mineral composition analysis,this study finds that the gold-bearing ore bodies in the Paodaoling are dominantly hosted in dacite porphyry dikes with age at~140 Ma,alteration associated with mineralization is dominated by illite-muscovite mineral assemblages,and the ores are mainly filled veins or stockworks,with low-temperature structures such as colloform,crustiform and drusy textures in some parts,and occur as pyrite,bournonite,bournonite-seligmannite solid solution,low-Fe sphalerite,and Mn-rich carbonate mineral assemblages in veins.These features indicated that the Paodaoling is an intermediate-sulfidation epithermal gold deposit.This type is the first case in the Middle-Lower Yangtze River Valley metallogenic belt,implying that the ore belt has the potential to find similar epithermal deposits.

关 键 词：地质学 中硫型 浅成低温热液矿床 抛刀岭金矿 安庆-贵池矿集区 长江中下游 

分 类 号：P618.41[天文地球—矿床学]