广西金牙金矿床原生地球化学异常特征及其找矿意义

广西金牙金矿床是一种浊积岩容矿、滑塌挤压复合断裂控矿的微细粒浸染型金矿床。本文通过大量岩石样品分析数据处理,对矿床原生地球化学异常特征探讨。认为:该矿床以发育Au、As、Sb、W、Hg等元素异常为特征,其原生晕的形态和空间展布较明显地受赋矿断裂构造所控制,基本上与矿体形态相吻合,故Au—As—Sb—W—Hg组合异常为典型的矿体晕;Hg异常也表现为一定程度的前缘晕特征。据此,建立了本区的找矿模式和找矿标志。

THE CHARACTERISTICS OF PRIMARY GEOCHEMICAL ANOMALY OF JINYA GOLD DEPOSIT IN GUANGXI AND ITS PROSTECTING SIGNIFICANCE

Jinya gold deposit in Guangxi is a micrograined-disseminated type gold deposit which occurs in turbidite and is controlled by slump-compressing composite faults. According to analytical data of a lot of rock samples, the characteristics of primary geochemical anomaly of this deposit are discussed in this paper. It is considered that the deposit is characterized by element anomalies of Au, As, Sb, W, Hg and the shape and distribution of primary halo of these elements are obviously controlled by ore-host faults and proximately coincident with those of orebodies, so the Au-As-Sb-W-Hg assemblage anomaly is the typical halo of orebody; to some extent, the Hg anomaly shows frontal halo. Hence, the prospecting model and criteria for gold are established in this area.