湖南锡田锡矿的发现及找矿潜力分析

Discovery of the Xitian tin deposit, Hunan, and its ore potential

湖南锡田锡多金属矿是近些年来南岭继骑田岭锡矿取得重大突破后寻找锡矿又一大的发现。锡田锡多金属矿由锡田岩体内外与岩体有明显成因联系的若干类型矿床组成。在南北长约18km,东西宽约10km的范围内,蕴藏的矿产资源包括锡、钨等多种金属矿产。形成一个以锡田岩体为中心向外依次为岩体型钨-锡矿床→构造蚀变带(脉)型钨-锡矿床→矽卡岩型(复合型)锡-钨矿床→铅-锌矿床的矿化分带。笔者通过对锡田锡矿主要矿床(化)类型的产出规律、赋存状态、形成原因与模式的探讨和研究,认为在同一成矿区形成种类齐全的不同的矿床类型是这一地区找矿潜力巨大的最重要的依据。笔者对锡田锡矿的找矿潜力进行了进一步分析,并对锡田锡矿资源量进行了初步预测。

The Xifian tin polymetaUic deposit in Hunan is another major discovery after the significant breakthrough in finding the Qitianling tin deposit during tin prospecting in the Nanling belt in recent years. The Xidan tin polymetallic deposit consists of several types of deposit which encircle the Xidan granite complex and have clear genedc reladon to the granite complex. With the Xidan granite complex as the center outward, multiple metallic minerals such as tin and tungsten occurring within an area of -18 （north-south） by -10 karl （east-west） form mineralization zoning of complex type tungsten-tin deposits→structural altered zone （vein） type tungsten-tin deposits →skam （compounding） type tungsten-tin deposits→lead-zinc deposits. By studying the modes of occurrence, origins and models of the main deposit （mineralization） types in the Xitian tin deposit, the authors believe that the formation of a complete range of types of deposit in the same metallogenic province is the most important ground for the huge ore potential. The authors perform a further analysis of the ore potential of the Xidan tin deposit and make a preliminary estimation of the resources in the Xitian dn deposit.