赣南漂塘钨矿锡石及共生石英中流体包裹体研究

Fluid Inclusion Studies on Coexisting Cassiterite and Quartz from the Piaotang Tungsten Deposit , Jiangxi Province , China

漂塘钨矿床是赣南地区一大型石英脉型钨多金属矿床,钨锡共生是该矿床的重要特征。在详细的岩相学观察基础上,采用"流体包裹体组合"(FIA)的研究方法,对该矿床锡矿化显著的(绿柱石)、锡石、黑钨矿-石英脉阶段石英脉中锡石及与其共生的石英中流体包裹体进行了显微测温和拉曼探针的分析。结果表明,锡石与共生石英形成的物理化学条件并不一致,两类矿物中流体包裹体揭示的流体演化过程也明显不同。锡石中原生的流体包裹体反映了锡石形成时真实的温压条件,与锡矿化相关的流体为高温、中—低盐度的NaCl-H2O流体体系。研究认为,锡石中流体可能主要来自于岩浆的结晶分异,流体体系的冷却是锡在流体中沉淀的主要机制。

The Piaotang tungsten deposit is a large vein type W-polymetallic deposit in southern Jiangxi Province , assemblage of W and Sn is one important feature of this deposit.Based on detailed petrographic observations and the means of Fluid Inclusion Assemblage （ FIA ）, we carried out microthermometric and Raman microspectroscopic studies of fluid inclusions in quartz and coexisting cassiterite in quartz veins which tin mineralized significantly.The results show that , the physical and chemical conditions of cassiterite and quartz formation are not consistent , and the fluid evolution process related to the two types of minerals are also significantly different.The primary fluid inclusions in cassiterite reflect the actual temperature and pressure conditions of cassiterite formation.The fluid related to tin mineralization for NaCl-H 2 O system with high temperature and medium to low salinity.The study indicate that , the fluid related to tin mineralization may be mainly from crystallization and differentiation of magma , and the cooling of fluid is the main mechanism of tin precipitation in the fluid.