海南二甲金矿成矿的热液机制探讨

On the Hydrothermal Metallogenetic Mechanism of the Erjia Gold Deposit,Hainan

二甲金矿是一个与戈枕断裂带和热液活动密切相关的金矿。本文研究了金的不同成矿阶段温度、压力以及其他物理化学参数的变化规律,从氢、氧同位素及黄铁矿中微量元素的特征,结合地质特征,认识到成矿热液主要来自岩浆水与大气降水地下水的混合水。另外,从物理化学计算和矿床的地质特征,探讨了金在热液中的迁移形式及金沉淀成矿的模式。

The Erjia gold deposit is located in Dongfang county,Hainan province.The ore-forming process of this deposit is closely re-lated to the Gezhen fracture zone and hydrothermal activity.The variation regularities of temperature,presure and some otherphysico-chemical parameters in different ore-forming stages of the,gold mineralization were investigated.Based upon the charac-teristics of H-O isotopes,and trace elements in pyrite,together with locat-geological features,it is recognized that the metallogenetichydrothermal solution was mainly derived from a mixture of magmatic and meteoritic waters.In this paper,the metallogeneticmechanism of the deposit,including the migration-precipitation of the gold in the hydrothermal fluid,is discussded.