八卦庙金矿床中含金石英脉的地球化学特征及意义

Geochemistry of Auriferous Quartz Veins in the Baguamiao Gold Deposit

八卦庙金矿床是分布于秦岭造山带中的一种中高温碳酸盐型热液金矿床。石英是其主要的脉石矿物之一，与金矿化密切相关。根据含金石英脉的产状可将其分为三种类型：①顺层石英脉；②含铁白云石石英脉；③ＮＥ向节理石英脉。它们在微量元素和稀土元素的组成特征上有一定的差异，分别形成于金的不同成矿阶段，是金在成矿作用过程中演化的产物。同时，为八卦庙金矿的成矿提供了条件。

The Baguamiao gold deposit in a sort of mesothermal hypothermal carbonate type gold deposit. Quartz, one of the major gangue minerals, is closely related to gold mineralization. According to modes of occurrence, auriferous quartz veins might be divided into three types:(1) bedding quartz veins;(2) ferriferous dolomite quartz veins;(3)quartz veins along NE trending joints. These types show certain differences in compositional characteristics of trace elements and rare earth elements and were formed respectively at different ore forming stages of gold, being evolutional products of gold in the process of ore forming process. Thermometric measurements of inclusions in quartz have provided evidence for mesothermal hypothermal origin of the Baguamiao gold deposit.