New understandings of 3D feature and mineralization enrichment regularity in the Dayingezhuang-Caojiawa gold deposit of Jiaodong Peninsula
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摘要:
基于291个钻孔资料建立了大尹格庄-曹家洼金矿床三维地质模型,剖析了金矿床的三维空间特征,指出了深部找矿方向。矿床主要由4个规模较大的矿体组成,矿体赋存于招平断裂下盘,主要分布在0~-1740 m标高之间。赋矿的招平断裂表面起伏变化明显,表现出浅部倾角较陡,向深部逐渐变缓的特征。招平断裂及金矿体受后期断裂切割。将被切割的矿体复原后进行三维可视化分析表明,主矿体厚度三维分布不均匀,呈厚、薄相间分布;主矿体品位分布较均匀,厚度较大区域品位也较高,二者相关系数为0.352;厚度×品位三维分布显示了明显的NEE向侧伏特征,侧伏向75°。矿床有4个矿化富集段,其空间位置与断裂倾角沿倾向呈现的三段陡-缓转折和相对缓倾角位置吻合,构成阶梯成矿特征。这说明,断裂倾角变化对金的沉淀富集有明显的控制作用,今后找矿中应重视对断裂倾角变化的研究和探测。分析认为,①-1与Ⅰ-2号矿体之间、Ⅰ-2号矿体北侧、沿②-69矿体75°方向延深位置均具有较好的找矿前景。研究成果为该矿床的深入研究和进一步深部找矿提供了重要的依据。
Abstract:This paper established a 3D geological model of the Dayingezhuang-Caojiawa gold deposit based on 291 boreholes data, analyzed the characteristics of gold deposit in the three-dimensional space and pointed out the direction of deep prospecting.The deposit consists of four large ore bodies which mainly distributed between 0 and -1740 m elevation in the footwall of Zhaoping fault.The surface undulation of Zhaoping fault where occurred the orebodies changes obviously, showing the characteristics of steep dip in the shallow part and gradual slowdown to the deep part.Zhaoping fault and gold ore bodies are cut by later faults.The three-dimensional visualization analysis of the rehabilitated ore body from shows that the 3D thickness distribution of main ore body is not uniform, showing thick and thin alternating distribution; The distribution of the grade of the the main ore body is uniform, and the area with larger thickness also has higher grade.The correlation coefficient between the thickness and the grade is 0.352.The three-dimensional distribution of thickness × grade shows that the ore body has an obvious NEE lateral characteristic, with lateral direction of 75°.There are four enrichment mineralization sections in the deposit, and their spatial locations are consistent with the three positions where the dip angle of the fault change from steep to slow and the position where the fault has a relatively slow inclination, which formed the characteristics of step mineralization.It indicates that the variation of fault dip angle has an obvious control effect on gold precipitation and enrichment.The study and detection of fault dip Angle should be emphasized in future prospecting work.The analysis shows that the position between ①-1 and Ⅰ-2 orebody, the north of Ⅰ-2 orebody and the position along the 75° direction of ②-69 orebody all have good prospecting prospect.The research results provide an important basis for further research and deep prospecting of the deposit.
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Key words:
- 3D model /
- deep gold mine /
- Dayingezhuang-Caojiawa /
- mineralization enrichment regularity
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图 1 大尹格庄-曹家洼金矿床地质简图①
Figure 1.
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