广西龙头山金矿床热液蚀变及其分布特征

Hydrothermal Alteration and Distribution Features of Longtoushan Gold Deposit in Guangxi

通过分析广西龙头山金矿热液蚀变矿物的分布特征,认为电气石化、硅化与金矿化关系最为密切;通过K-Ar同位素年龄测定,推断电气石化、硅化为早期热液蚀变,与流纹斑岩、角砾熔岩有关,而高岭石化、绢云母化等与后期花岗斑岩以及黑云母花岗斑岩脉等岩浆活动关系密切。结果表明这一金矿床的产出深度略大于一般所报道的大多浅热液金矿床。

By analyzing the distribution characteristics of hydrothermal altered minerals in Longtoushan gold deposit,it is considered that gold mineralization is closely related to tourmalinization and silicification. According to the K-Ar isotopic dating and so on,tourmalinization and sihcification belong to the earliest hydrothermal alteration, which are related to hy- olitic porphyry and breccia lava. Sericitization and kaoliniztion relate to the intrusions of granite-porphyry and biotite granite- porphyry at the later stage. The study results show that the depth of gold mineralization in this area is slightly greater than others which were often mentioned.