宋明春, 杨立强, 范宏瑞, 于学峰, 丁正江, 张永文, 邱昆峰, 李杰, 张良, 王斌, 李世勇. 找矿突破战略行动十年胶东金矿成矿理论与深部勘查进展[J]. 地质通报, 2022, 41(6): 903-935. DOI: 10.12097/j.issn.1671-2552.2022.06.001
    引用本文: 宋明春, 杨立强, 范宏瑞, 于学峰, 丁正江, 张永文, 邱昆峰, 李杰, 张良, 王斌, 李世勇. 找矿突破战略行动十年胶东金矿成矿理论与深部勘查进展[J]. 地质通报, 2022, 41(6): 903-935. DOI: 10.12097/j.issn.1671-2552.2022.06.001
    SONG Mingchun, YANG Liqiang, FAN Hongrui, YU Xuefeng, DING Zhengjiang, ZHANG Yongwen, QIU Kunfeng, LI Jie, ZHANG Liang, WANG Bin, LI Shiyong. Current progress of metallogenic research and deep prospecting of gold deposits in the Jiaodong Peniusula during 10 years for Exploration Breakthrough Strategic Action[J]. Geological Bulletin of China, 2022, 41(6): 903-935. DOI: 10.12097/j.issn.1671-2552.2022.06.001
    Citation: SONG Mingchun, YANG Liqiang, FAN Hongrui, YU Xuefeng, DING Zhengjiang, ZHANG Yongwen, QIU Kunfeng, LI Jie, ZHANG Liang, WANG Bin, LI Shiyong. Current progress of metallogenic research and deep prospecting of gold deposits in the Jiaodong Peniusula during 10 years for Exploration Breakthrough Strategic Action[J]. Geological Bulletin of China, 2022, 41(6): 903-935. DOI: 10.12097/j.issn.1671-2552.2022.06.001

    找矿突破战略行动十年胶东金矿成矿理论与深部勘查进展

    Current progress of metallogenic research and deep prospecting of gold deposits in the Jiaodong Peniusula during 10 years for Exploration Breakthrough Strategic Action

    • 摘要: 2011年原国土资源部组织实施找矿突破战略行动以来,胶东金矿深部找矿取得了重大成绩,新增金资源量约2958 t,勘查评价了12个大型及以上金矿床,发现了2个超巨型金矿床。胶东地区累计探明金资源量逾5000 t,占全国的1/3。这些成果的取得得益于对成矿构造背景、成矿规律、矿床成因等成矿理论认识的不断深化和勘查技术方法的不断进步。胶东金矿成矿作用及相关研究是国内地学研究的热点之一,总结了近10年胶东金矿成矿背景、矿床分布、成矿时代、矿床地球化学、成矿模式、矿床成因等方面的研究进展或突破,尤其是对深部成矿模式、大规模成矿机制等研究取得的原创性成果。研究表明,胶东金矿形成于埃达克性质花岗岩转化为弧花岗岩的岩浆活动背景,岩浆岩和岩石圈地幔地球化学性状转化为金成矿提供了物质来源,早白垩世热隆-伸展构造为大规模金成矿提供了有利条件,断裂倾角变化控制了流体聚集和富矿柱的形成,成矿物质和流体来源有幔源因素,胶东型金矿是与经典造山型金矿和其他已知金矿类型不同的新的金矿成因类型。胶东金矿勘查综合应用了成矿规律、大探测深度地球物理方法、构造叠加晕地球化学方法、三维地质建模、深孔钻探等技术方法,以赋矿构造位置为目标、以频率域电磁探测为主要技术手段的深部金矿阶梯找矿方法发挥了重要作用。深部勘查发现,新探明的金资源量集中于1000~2000 m深度,绝大部分为破碎带蚀变岩型矿化,三山岛地区和焦家地区的多个浅部矿体向深部连为一体,构成资源量大于1000 t的超巨型金矿床。探明了中国首个海域金矿床,在胶东东部发现黄铁矿碳酸盐脉型新的金矿化类型。综合分析指出,晚中生代构造体制转换对大规模成矿的影响、断裂控矿机理、成矿流体和物质来源、金矿资源潜力及精细高效的找矿技术等是今后的重点研究方向。

       

      Abstract: Since the implementation of the Exploration Breakthrough Strategic Action organized by the former Ministry of Land and Resources in 2011, great achievements have been made in the deep prospecting of Jiaodong gold deposit, with the newly increased gold resources of about 2958 t.12 large gold deposits have been explored and evaluated, and 2 super-giant gold deposits have been found.The accumulated proven gold resources in Jiaodong Peninsula have reached more than 5000 tons, accounting for 1/3 of the whole country.These prospecting achievements are attributed to the deepening understanding of metallogenic theories such as metallogenic tectonic setting, metallogenic regularity and genesis of deposits and the continuous progress of exploration techniques and methods.The metallogenesis and related research of the Jiaodong gold deposit are the hotspots of domestic geological research.This article briefly summarizes the research progress in the recent 10 years in metallogenic background, deposit distribution, metallogenic epoch, geochemistry of ore deposit, metallogenic model and genesis, especially the original achievements in the research of deep metallogenic model and large-scale metallogenic mechanism.These results indicate that the Jiaodong gold deposit was formed in the magmatic activity background of adakite granite transformed into arc granite, the geochemical transformation of magmatic rocks and lithospheric mantle provides material sources for gold mineralization, the Early Cretaceous thermal doming-extension structures provided favorable conditions for large-scale gold mineralization, the change of fault dip angle controlled the fluid accumulation and the ore-rich pillars, the source of ore-forming materials and fluids have mantle-derived factors, and the Jiaodong type gold deposit is a new genetic type of gold deposit, which is different from the classical orogenic gold deposit and other known types.The exploration of the Jiaodong gold deposits comprehensively applied prospecting methods such as deep geophysical exploration, structural superimposed halo geochemical prospecting, three-dimensional geological modeling and deep drilling, etc., The ladder prospecting method for deep gold deposits, which takes the location of ore bearing structure as the target and frequency domain electromagnetic detection as the main technical means, plays an important role.This paper summarizes the important progress of deep exploration.The deep gold resources are concentrated in the depth of -1000 m to -2000 m, most of which are fracture zone altered rock type mineralization.Several shallow ore bodies in Sanshandao area and Jiaojia area are connected to the deep, forming a super-giant gold deposit with resources greater than 1000t.In recent years, the first offshore gold deposit in China has been discovered, and the pyrite carbonate vein type gold deposit has been defined as a new type in the east of Jiaodong.Finally, this paper briefly analyzes the unresolved problems in the deep exploration research of the Jiaodong gold deposit, and points out that the influence of Late Mesozoic structural system transformation on large-scale mineralization, the mechanism of fault-controlling ore, the source of ore-forming fluids and materials, the potential of gold resources and the fine and efficient prospecting techniques are the key research direction in the future.

       

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