夏甸——姜家窑金矿床三维地质结构及矿体赋存规律

三维地质模型可直观展示金矿床地质特征,在数据提取、分析上更加方便、准确,便于研究金矿床地质特征,深化成矿规律认识。夏甸—姜家窑地区是我国重要的金矿产地,目前勘查深度已超2000m,勘查程度高,地质资料丰富,易于构建三维地质模型。本文在基于200余个钻孔资料建立夏甸-姜家窑金矿床三维地质模型的基础上,分析了金矿床的三维空间特征。通过三维透明化分析发现,以往作为独立金矿床勘查、开采的多个浅部矿区,其主要矿体向深部连为一体,构成一个超大型金矿床。矿体品位×厚度的三维分布显示有2处矿化富集区。主控断裂在三维空间上形态变化大,构造产状变化地段为矿体富集部位。分析表明,矿化富集区与断裂倾角变化部位相吻合,且矿体主要富集在倾角较缓部位,认为探索深部构造三维形态可有效指导深部找矿。

3D Geological StructureS and Occurrence Regularity of Ore Bodies of Xiadian-Jiangjiayao Gold Deposit

3D geological model can visually display geological characteristics of gold deposits, which is more convenient and accurate in data extraction and analysis. It is convenient to study geological characteristics of gold deposits and deepen the understanding of metallogenic regularity. Xiadian-Jiangjiayao area is an important gold producing area in China. At present, the exploration depth of Xiadian-Jiangjiayao gold deposit has exceeded 2000m. According to high exploration degree and rich geological data, it is easy to build a 3D geological model. In this paper, 3D spatial characteristics of gold deposit have been analyzed based on 3D geological model of Xiadian-Jiangjiayao gold deposit which is established with data from more than 200 drillholes. Through analysis on 3D perspective model, it is found that main ore bodies of the deposits which are explored and exploited as several independent gold deposits in the past are connected deep down and constitute a giant gold deposit. 3D distribution of grade × thickness of the ore bodies shows that there are two enriched mineralization areas. The morphology of the main fault changes greatly in three dimensional space, and the area with structural occurrence changes is the enrichment area of the ore bodies. It is showed that the mineralization enrichment area is consistent with the change of fault dip angle, and the ore bodies are mainly concentrated in the area where the fault has a gentle dip angle. It is believed that the exploration of three dimensional morphology of the deep structures can effectively guide the deep prospecting.