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根据地质和同位素地球化学特征 ,建立了铜陵地区赋存于石炭系地层底部的块状硫化物矿床的成因模型 ;该类型矿床的形成主要与石炭纪海底热水活动有关 ,属喷流_沉积型 (SEDEX)块状硫化物矿床 ;下伏古生代地层是重要的成矿金属源区 ,海水硫酸盐是硫化物成矿的主要硫源。成矿热流体循环的动力学数值模拟揭示 ,该类型矿床底盘岩石中的流体活动和热影响范围主要局限在主排泄通道两侧较小的区域内 ;温度场和流场决定以沉积岩为容矿岩石的喷流_沉积型块状硫化物矿床底盘岩石中的蚀变和矿化强度不如以火山岩为容矿岩石的块状硫化物矿床。伴随强大深部热流的张性同生断裂是控制喷流_沉积型块状硫化物矿床形成与分布的关键因素 ,海西期扬子板块北缘的张性构造体制为该时期喷流_沉积型块状硫化物矿床的形成提供了有利的地球动力学环境。
According to geologic and isotopic geochemical characteristics, a genetic model of massive sulfide deposits in the bottom of Carboniferous strata is established in Tongling area. The formation of this type of deposit is mainly related to the activity of the submarine hot water in the Carboniferous, (SEDEX) massive sulfide deposit. The underlying Paleozoic strata are important metallogenic metallogenic source, and seawater sulphate is the main sulfur source for sulphide mineralization. The dynamic numerical simulation of metallogenic thermo-fluid circulation reveals that the fluid activity and heat-affected range in the rock of this type of deposit are mainly confined to the smaller area on both sides of the main drainage channel. The temperature field and flow field are determined by the sedimentary rock Rock Jet-Depositional Massive Sulfide Deposits Chassis rocks have less alteration and mineralization strength than massive volcanic rock-hosted massive sulfide deposits. Tensile isotopic fractures with strong deep heat flow are the key factors controlling the formation and distribution of the jet-sedimentary massive sulfide deposits. The Zhang-tectonic system in the northern margin of the Hercynian Yangtze Plate is the core of the jet-sedimentary mass vulcanization The formation of mineral deposits provides a favorable geodynamic environment.