广西贵港新村金矿地球化学特征及深部找矿前景

Geochemical characteristics and prospects for deep prospecting of the Xincun gold deposit in Guigang,Guangxi

在矿床地质研究的基础上,对新村金矿已开采中段岩(矿)石进行系统采样,进行成矿微量元素、稀土元素等矿床地球化学特征分析。通过分带指数法和变异性指数,确定新村金矿的原生晕轴向垂直分带序列。并结合前人总结的中国金矿床原生晕综合轴向(垂直)分带性研究成果,建立了新村金矿床轴向分带的原生晕叠加模式,从而对其深部成矿远景进行预测。研究结果表明,Au及其伴生元素均来自寒武系黄洞口组中上段碎屑岩中,Au与Ag、As、Sb、W等元素组合密切,As、Sb为前缘晕指示元素,Au、Ag为主矿化元素,W、Mo为矿化的尾晕指示元素,Sb等典型前缘晕元素出现在分带序列的中下部,典型的后尾晕元素Mo出现在中部,指示深部可能还有盲矿存在或第二个富集带。同时为其他同类型金矿床深部找矿和勘探工作提供指导。

On the basis of the study on the geology of the deposit,systematic sampling in rocks(ore)of the middle section from Xincun gold deposit was carried out,and the geochemical characteristics of the deposit such as trace elements and rare earth elements were analyzed.Through the zoning index method and the var-iability index,the primary halo vertical zoning sequence of the Xincun gold deposit was determined.Com-bined with the results of predecessors'studies on the vertical zonality of the primary halo in Chinas gold de-posits,the superposition model of the axial zoning of the Xincun gold deposit was established to predict its deep metallogenic prospect.The results of the study showed that,Au and its associated elements were allfrom the detrital rocks of the middle and upper section of Huangdongkou Formation of Cambrian system.Au was closely correlated with the elements Ag,As,Sb,W and formed combination of elements.As and Sb were leading edge halo indicator elements,Au and Ag were mainly mineralized elements,and W and Mo were mineralized tail halo indicator elements.Sb and other typical leading edge halo elements appeared in the middle part of the zoning sequence,while Mo of typical rear halo elements appeared in the middle part,indi-cating that there might be blind ore or a second enrichment zone in the deep part.