广西昭平县湾岛金矿控矿条件调查研究与靶区预测

Investigation of Ore-control Conditions and Prospecting Target Prediction for the Wandao Gold Deposit in Zhaoping County,Guangxi Province

本文以桂东大瑶山金矿集区最新勘探发现的广西昭平湾岛金矿为例,对其开展控矿条件调查研究,发现该矿床的金矿体有两种类型,分别受到花岗斑岩体、构造破碎带控制,斑岩体锆石U-Th-Pb年龄(465Ma)与构造破碎带控制的含金石英脉Ar-Ar年龄(187.87～244.88Ma)的明显差异也说明多种矿化类型的存在。弄清以上两个控矿条件的分布是下一步找矿的关键,通过物化探资料分析,总结找矿标志,提出了矿区外围3个找矿靶区并得到钻探验证。本文所介绍的金矿评价方法对大瑶山金矿集区的勘查找矿工作有重要的参考意义。

The Wandao gold deposit in Zhaoping County,Guangxi is a newly discovered deposit in the Dayaoshan gold mineralization area in eastern Guangxi Province.In this study,we take it as an example to research its ore-controlling conditions.It is found that the two types of the gold orebodies are controlled by granite porphyry and structural structural fractured zones respectively.Formation of the ore bodies needs some space,so the survey about orebody’s spatial occurrence and formation conditions is a useful method during exploration.For the porphyry,the zircon U-Th-Pb age is 465Ma,and gold bearing quartz veins controlled by structural fractured zones has the Ar-Ar age 187.87-244.88Ma.The considerable difference in these ages indicats the existence of various types of mineralization.So,to clarify the distribution of the two controlling conditions is the key for the next stage of exploration.By analyzing geophysical and geochemical data,and summarizing the prospecting indicators,we have suggested three prospective zones which have been verified by drillings.which confirmed our thoughts.The assessment method of gold deposits presented in this paper is of great importance to the further survey and ore-search work in the Dayaoshan gold deposit area.