达亚纳石英脉型钨钼矿床流体包裹体特征

Fluid Inclusion Geochemistry of the Dayana Quartz Vein Type W-Mo Deposit

达亚纳钨钼矿床是近年来内蒙古东乌旗-嫩江成矿带西南端的一个中小型石英脉型钨钼矿床。通过对主成矿阶段石英脉中的流体包裹体进行了显微测温研究表明,其流体包裹体主要类型有NaCl-H_2O型、CO_2-H_2O型和含子晶包裹体;显微测温实验结果表明成矿流体主要表现为中-高温,中-低盐度特征。对流体包裹体的分析发现成矿具有多期次,脉动式热液充填成矿特点,可将成矿热液划分为五期热液活动,前三期为成矿期热液活动,后两期为成矿后热液活动。达亚纳钨钼矿成矿机制为流体混合沉淀成矿。

The Dayana W-Mo deposit is a medium small quartz vein type one which is found at the southwest end of the Dong Ujimqin-Nenjiang metallogenic belt. This paper deals with fluid inclusion geochemistry of the deposit. The study indicates that the fluid inclusion may be divided into 3 types such as Na Cl-H2O, CO2-H2O and Containing crystal types. The homogenization temperature is medium-high. Salinity is medium-low. Hydrothermal activity may be divided in 5 stages. The hydrothermal activity in first three stages was related to the ore-formation. The hydrothermal activity in late two stages was post-mineralization.