胶东大尹格庄-曹家洼金矿床三维空间特征及矿化富集规律新认识  

New understandings of 3D feature and mineralization enrichment regularity in the Dayingezhuang-Caojiawa gold deposit of Jiaodong Peninsula

作　　者：解天赐 戴长国 李瑞翔 刘向东 隋晓玲 薛欢欢 XIE Tianci;DAI Changguo;LI Ruixiang;LIU Xiangdong;SUI Xiaoling;XUE Huanhuan(School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255000,Shandong,China;No.6 Institute of Geology and Mineral Resources Exploration of Shandong Province,Zhaoyuan 265400,Shandong,China;Shandong Provincial Big Data Application and Development Engineering Laboratory of Deep Gold Prospecting,Weihai 264209,Shandong,China;Shandong Province Nuclear Industry Geological Group 273,Yantai 264000,Shandong,China)

机构地区：[1]山东理工大学资源与环境工程学院,山东淄博255000 [2]山东省地质矿产勘查开发局第六地质大队,山东招远265400 [3]山东省深部金矿探测大数据应用开发工程实验室,山东威海264209 [4]山东省核工业二七三地质大队,山东烟台264000

出　　处：《地质通报》2022年第6期986-992,共7页Geological Bulletin of China

基　　金：国家自然科学基金项目NSFC-山东联合基金《胶东深部金矿断裂控矿机理》(批准号:U2006201);省财政资金项目“深地资源勘查开采”重点研发计划专项《深部金矿评价理论、方法与预测》(编号:2017CXGC1604);山东省地质矿产勘查开发局项目(编号:KC2017008、KC2018006、202009);山东省第六地质矿产勘查院《焦家式金矿编著》(编号:LYKY2020-01)。

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=2\*GB3-69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。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 between①-1 andⅠ-2 orebody,the north ofⅠ-2 orebody and the position along the 75°direction of②-69 orebody all have good prospecting prospect.The research results provide an important basis for further research and deep prospecting of the deposit.

关 键 词：三维模型 深部金矿 大尹格庄-曹家洼 矿化富集规律 

分 类 号：P618.51[天文地球—矿床学] P628[天文地球—地质学]