江西大吉山脉钨矿床矿化富集特征及其机理初探

大吉山脉钨矿床矿化特征主要是走向上双峰富集,垂向上中部富,上下变贫。剖面上矿化围绕某些地段特别富集,形成“多中心”的富集型式。上述特征是成矿流体贯入裂隙过程中内外因素综合作用的结果,即水化硅氧聚合离子群“准溶液” 粘性流体体系贯入裂隙时,流体运动遵循流体动力学定律,以聚合离子团搬运的钨,随流体运动在有利的条件下产生富集,然后随温度降低,其物质组分就地调整、结晶、形成矿脉。

THE PROPERTY AND MECHANISM OF THE MINERALIZATION CONCENTRATION IN DAJISHAN TUNGSTEN DEPOSIT, JIANGXI PROVINCE

The mineralization of W - bearing quartz veins in Dajishan is characterized by the concentration in middle parts of veins, the impoverishment towards the upper and root zones in dip , and the bimodality concentration in trend, as well as the polycentric concentration around several places in vertical section. These properties are derived from the comprehensive controlling of in-ternal and external factors during the initial viscous ore-forming fluid which is hydrous silicon-oxygen polymeric ions "quasi-solution" filling fissures.The fluid migration follows the rule of viscous fluid dynamics . The fluid ascends along fissures, and tungsten mainly transported by polymeric ions takes place enrich-ment under the favorable conditions. Subsequently, the components in the fluid are essentially regulated locally and crystallized to form W-bearing quartz veins with the decrease of temperature.