【作者】 王道华； 傅德鑫； 吴履秀； 周志化； 楼启炳； 顾云峰；

【Author】 Wang Daohua,Fu Dexing,Wu Luxiu (IGMR,Nanjing) Zhou Zhihua,Lcu Qibing and Gu Yunfeng (Nonferrous Metal Industry Company,Tongling)

【机构】 南京地质矿产研究所； 铜陵有色公司；

【摘要】 <正>下扬子区是我国重要成矿区(带)之一,矿产资源丰富,尤以有色金属(Cu、Pb、Zn)和贵金属(Au、Ag)引人注目。对于它们的成矿作用却有着中、低温热液及冷液矿化理论(谢家荣、程裕淇、1936)及与接触交代作用有关的矽卡岩成矿论(郭文魁,1957)、与正常沉积作用有关的同生沉积成矿论(孟宪民,1960年)、沉积—改造成矿论(李文达,1977)、与火山作用有关的"沉积—火山沉积—热液迭加改造"成矿论(徐克勤、1980)、斑岩矿床(赣西北地质大队,1974)、玢岩铁矿论(宁芜研究项目编写小组,更多还原

【Abstract】 The Lower Yangtze area,one of the important metallogenic belts in China,is abundant in iron and base metals（Cu,Pb,Zn） as well as noble metals（Au,Ag）.In recent years,the authors have done much research work on regional geological settings,metallogenic enviroments and metallogeny,and suggested that the bedded sulfide deposits in this area are sedimentary-submarine effusive-hydrothermal origin.They are hosted in the strata of carbonate rocks of Middle Carboniferous age. The occurrence of these stratiform Cu deposits exhibits the following features:1)they are controlled by several E-W trending fault basins; 2)the orebodies are usually found in bedded form and are deposited and folded synchronously with the hosted rocks;3)frequent occurrence of the sedimentary texture and structure of the ore;4)temperatures of formation within the range of 280～350℃;5)stable isotopic features are:The isotope of lead in pyrite from bedded ore body bears a character of normal lead of single stage,its age values are concentrated around 260～340m.y;theδ³⁴S value of sulfide is 4～10‰;the associated minerals:quartzδ¹⁸O=13.4‰（SMOW）,sideriteδ¹⁸O=14.25‰（SMOW）,dolomite in wall rocksδ¹⁸O=17‰±（SMOW）;quartzδ¹⁸O_H2O =-1.8～5.9‰,mean value=3.88～4.5‰,δ¹⁸O_H2Oof siderite associated with quartz=-0.42～6.67‰,mean value=3.8～4.8‰;the contemporaneous metamorphic minerals（e.g.serpentine）δD_H2O=-16～-49‰. The above data suggested that the ore forming fluids might be amixture of brine,meteoric water as well as metamorphic water.During the convection of the fluids they absorbed the metals and finally ascending to the sea floor in the form of metalliferous hydrothermal solution. The effusion and sedimentation of these metal-bearing hydrothermal solution along the fractures or vents would result to the type of ore deposits which bear a character of"sedimentary-submarine effusiue-hydrothermal origin".更多还原