与侵入岩有关的金矿成矿体系中Au与成矿伴生元素相关关系研究

Correlations between gold and other ore-forming elements in intrusion-related gold metallogenic system

与侵入岩有关的金矿成矿体系是近十几年来金矿研究的热点之一。以澳大利亚新英格兰造山带尤腊拉地区发现的某金矿脉为研究对象,基于土壤-围岩-低品位矿化体-矿体,较系统地研究了Au与其他成矿元素的相关关系,发现Au与As一直呈正相关,而Au与Na在原生环境中却表现出明显的负相关;另外,Ag、S、Sb 3个元素与Au在矿体中表现出弱负相关,而在其他3种介质中表现出正相关。综合以上研究结果,提出以As+Na作为IRGS型金矿的找矿指标,同时应重视综合利用Ag、S、Sb 3个元素。

The intrusion-related gold metallogenic system is a research focus among gold deposit researches around the world in the recent decade. Taken the discovered gold veins in Uralla,New England Orogen,Australia as examples,this study discussed the correlation between Au and other metallogenic elements in soil,wall rocks,low-grade gold mineralized bodies and ore bodies. The results show that Au generally has a positive relationship with Au in the system,but a significantly negative relationship with Na. In addition,Ag,S and Sb display a relatively week negative correlation with Au in ore body,while they show a positive correlation with Au in soil,wall rocks and low-rade gold mineralized bodies. It is thus proposed that,As and Na can act as a combined exploration index for intrusion-related gold systems,especially in soil and lithological geochemical exploration,and a compresensive utilization of Ag,S and Sb should also be emphasized.