Geological characteristics and metallogenic potential of Bandaoshan gold-antimony ore area in Ejina Banner of Inner Mongolia
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摘要: 内蒙古额济纳旗半岛山金锑矿区位于北山成矿带南带,宏观上具有寻找中—大型金矿的潜力。运用地质-地球物理-地球化学综合找矿方法进行分析,认为半岛山金锑矿区矿源层为长城系古硐井群下岩性组变质岩系,矿(化)体分布于脆-韧性构造控制的蚀变带内,区内石英细网脉或大脉发育,后期多次的变形变质作用叠加改造,使金进一步富集成矿,具典型造山型金矿特征,成矿潜力很大。对该区成矿特征研究既可指导下一步找矿方向,同时也可为在北山南带韧性剪切带内寻找同类型矿产开拓思路、提供借鉴。Abstract: The Bandaoshan gold-antimony ore area in Ejina Banner of Inner Mongolia is located in the southern belt of Beishan metallogenic belt, with the medium-large gold deposits metallogenic potential from macroscopic scale. The source bed of the gold-antimony deposit in Bandaoshan is identified as metamorphic rock series of the Lower Lithologic Formation of the Gudongjing Group in Changchengian System, using the comprehensive prospecting method of geology, geophysics and geochemistry. The ore bodies are distributed in the alteration zone controlled by the brittle ductile structure, with fully developed quartz veinlets or veins. The gold is further enriched and mineralized by the superimposition of deformation and metamorphism in the later stage, which shows typical characteristics of orogenic type gold ore and great metallogenic potential. The research of metallogenic characteristics in this area would provide guides on the next prospecting direction, and references for the exploration of mine-rals with the same type in the ductile shear zone of the southern Beishan belt.
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