黔西南戈塘金矿三维地质建模与矿床成因研究

Study on Three-Dimensional Geological Modeling and Genesis of Getang Gold Deposit in Southwestern Guizhou

为直观展现戈塘金矿矿体空间展布规律并进行综合成矿分析,本文基于现有钻孔与剖面等地质资料,结合已有成矿物质来源等研究结果,利用Petrel软件建立了戈塘金矿三维地质模型,在此基础上讨论了戈塘金矿体在地下的空间展布规律与富集特征,分析了该矿床的成矿过程,并总结了该矿床的成矿模式。研究结果表明:Au主要富集于龙潭组1段地层,大多矿体品位较低,达到工业品位的矿体多集中于断层附近,总体上矿体品位与矿体体积呈负相关,但高品位矿体多次出现体积的异常增加;矿床顺地层展布特征显著,受不整合面或层间滑脱面控制明显,但断层可能为含矿热液提供了上升通道;矿床形成与岩浆活动有较大关系,热液沿断层进入含矿层并发生强烈蚀变,使Au析出预富集,在后期地下水等作用下形成金矿床,为热液运移-流体改造的成矿模式。上述研究结果对我国卡林型金矿成因研究及找矿工作具有一定的指示及参考意义。

In order to intuitively show the spatial distribution law of Getang gold deposit and carry out comprehensive metallogenic analysis,based on the existing geological data such as boreholes and profiles,combined with the existing research results of ore-forming material sources,a three-dimensional geological model of Getang gold deposit was established using Petrel software.On this basis,the spatial distribution and enrichment characteristics of Getang gold deposit were discussed,the metallogenic process of the deposit was analyzed,and the metallogenic model of the deposit was summarized.The results show that Au is mainly enriched in the first member of Longtan Formation,and most of the ore bodies have low grade.The ore bodies with industrial grade are mostly concentrated near the fault;in general,the grade of ore bodies is negatively correlated with the volume of ore bodies,but the abnormal increase of volume occurs many times in high grade ore bodies.The distribution characteristics of the deposit along the strata are significant,which are obviously controlled by the unconformity surface or the interlayer slip surface,but the fault may provide an upward channel for the ore-bearing hydrothermal fluid.The formation of the deposit is closely related to magmatic activity;the hydrothermal fluid enters the ore-bearing layer along the fault and undergoes strong alteration,so that Au is precipitated and pre-enriched,and the gold deposit is formed under the action of groundwater in the later stage,which is the metallogenic model of volcanic sedimentation-hydrothermal transformation.The above research results have certain indication and reference significance for the genesis research and prospecting work of Carlin-type gold deposits in China.