胶东玲珑矿田石英脉型金矿床中流体包裹体特征研究

Study on Characteristics of Fluid Inclusions in Linglong Quartz Vein Type Gold Deposit

摘要:

玲珑矿田含有两种类型金矿床，一是蚀变岩型金矿床，二是石英脉型金矿床。该文重点研究玲珑金矿田西山矿区石英脉型金矿床中流体包裹体的特征。石英脉型金矿床分布在玲珑帚状构造之中，含金石英脉受“帚状构造”的断裂和节理控制，有300余条。流体包裹体显微观察研究表明，玲珑石英脉型金矿新鲜花岗岩和钾化花岗岩主要含有H2O包裹体，其次有少量H2OCO2包裹体；(黄铁)绢英岩通常含较粗粒石英集合体，石英中有丰富的H2O，特别是H2OCO2包裹体；金矿体(含金石英脉)含有明显数量的H2OCO2包裹体；特别是存在较大的三相H2OCO2包裹体。不同期次(世代)石英中H2O和H2OCO2包裹体的大小、形态、相对含量和丰度变化较大。

Abstract:

There are two types of gold deposits in Linglong mine area: one is altered rock type gold deposit, and the other is quartz vein type gold deposit. In this paper, characteristics of fluid inclusions in quartz vein type gold deposit has been studied mainly. Altered rock type gold deposits distributes in Linglong brush structures.There are more than 300 quartzbearing veins whichi were controlled by brsuh structrual faults and joints. As showed by microscopic observation of fluid inclusions, fresh granite and potassic granite inclusions in Linglong quartz vein type gold deposit contained H 2O inclusions mainly, and followed by a small amount of H2OCO2 inclusions; while pyrite phyllic usually contained more coarsegrained quartz aggregates phyllic quartz with rich H2O, especially H2OCO2 inclusions. Gold ore bodies (gold bearing quartz veins) contained a significant number of H2OCO2 inclusions, especially in the presence of a larger threephase H2OCO2 inclusions. Size, shape, contents and abundance of H2O and H2OCO2 inclusions in quartz in different periods (generations) were very different.