大井矿床锡铜矿体成矿流体研究及其成因意义

Study of tin and copper metallogenetic fluid from Dajing deposit and its genetic significance.

大井矿床锡铜矿体萤石中存在中 -高温度、低盐度含锡和中 -低温度、中等盐度含铜两种流体包裹体 ,该两种流体包裹体的分布、气液比、温度 -盐度关系初步显示它们是两种不同的流体体系 ,而不是一种流体从高温向低温、高盐度向低盐度的系列演化 ,与成矿阶段的划分基本吻合 ,表明大井矿床锡铜矿体很可能是两种不同来源的成矿流体在同一空间上的叠加成矿 ,因而锡和铜可以形成单独矿体。该两种流体包裹体的发现和研究对进一步追索大井矿床不同矿种流体的来源和演化有重要意义 。

Two kinds of fluid inclusions in fluorite were recognized in Dajing deposit, i.e. tin bearing intermediate to high temperature and copper bearing low temperature ones. The relationship between homogenization temperature and salinity indicates that they belong to two fluid systems rather than evolved from one kind of fluid, which holds the same conclusion from classification for mineralization stages. It suggests that tin and copper could be formed in independent mineralization, and the tin copper mineralizations in the Dajing deposit might formed in same place but might come from different metallogentic fluids source. The discovery and study of these two kind fluids inclusions have important significance for trace the source and evolusion of different kinds of fluids and it might provide some new evidences for the genesis of Dajing deposit and prospecting around the mine.