山东省平邑县归来庄金矿原生晕特征及深部远景

Primary Halo Characteristics and Deep Metallogenic Prospect of Guilaizhuang Gold Deposit in Pingyi,Shandong Province

归来庄金矿床位于华北板块鲁西隆起区之内,是鲁西地区规模最大的金矿床。以归来庄金矿床地质特征为基础,从原生晕元素分带、地球化学参数、原生晕模型等多方面研究了归来庄金矿床主矿体原生晕的地球化学特征,以期为深部找矿提供理论指导。原生晕轴向分带特征明显:F-V-Mo-Se-Pb-Bi-Ag-Au-Sb-As-Tl-W,存在"反向分带"特征及前尾晕叠加特征;指示性元素衬度系数显示Au元素在不同标高的富集程度,反映了成矿作用具有多阶段、多期矿化叠加的特征;剥蚀参数变化向深部有上升趋势且剥蚀参数较大,指示矿体沿倾向方向深部有延伸或深部存在盲矿体。综合矿体原生晕轴向分带特征、地化参数特征以及构造特征,推测矿体深部具有较大找矿潜力。

The Guilaizhuang gold deposit is located in the Luxi uplift area of North China plate and it′s the largest gold deposit in Luxi area.Based on the geological characteristics of the Guilaizhuang gold deposit,this paper studies the geochemical characteristics of the primary halo of the main ore body of the Guilaizhuang gold deposit from the perspectives of the zoning of primary halo elements,geochemical parameters,and primary halo models,so as to provide theoretical guidance for deep prospecting.The primary halo axial zoning features are obvious:F-V-MoSe-Pb-Bi-Ag-Au-Sb-As-Tl-W,and there are"reverse zoning"features and the superposition features of the front and tail halo.The index element contrast coefficient shows the enrichment degree of Au element at different elevations,which reflects the characteristics of multi-stage and multi-stage mineralization superposition of mineralization.The change of denudation parameter has an upward trend to the deep and the denudation parameter is larger,indicating that the ore body extends along the dip direction or there are blind ore bodies in the deep.Based on the characteristics of the primary halo axial zoning,geochemical parameters,and structural characteristics,there is great potential for ore exploration in the deep part of the ore body.