摘要:
华北陆块是我国最重要的铁矿资源分布区之一,在目前铁矿资源对外依存度居高不下的背景下,深化铁矿成矿规律研究和找矿勘查工作迫在眉睫。本文以矿床成矿系列理论为指导,以地质年代为界线,结合对华北陆块构造演化的研究进展,厘定出6个铁矿床成矿系列:(1)华北陆块与太古宙海相火山-沉积变质作用有关的Fe矿床成矿系列(组);(2)华北陆块东部与古元古代岩浆、火山-沉积变质作用有关的Fe矿床成矿系列(组);(3)华北陆块北部与中元古代构造旋回岩浆-沉积作用有关的Fe、Ti、V矿床成矿系列(组);(4)华北陆块东部与新元古代岩浆-沉积作用有关的Fe矿床成矿系列(组);(5)华北陆块与古生代火山-沉积、沉积作用有关的Fe矿床成矿系列(组);(6)华北陆块中东部与燕山期岩浆作用有关的Fe矿床成矿系列(组)。六个矿床成矿系列构成了较为完整的铁矿成矿谱系,通过对华北铁矿成矿系列系统的研究总结,认为找矿工作应聚焦于地质单元、时间、地质作用、有用组分、矿床类型组合五个维度,而矿床式作为典型矿床深入研究后高度概括的成果,对找矿工作也有很大启发意义,对于白云鄂博、陈台沟、司家营、杏山等重点矿山构造的重新认识,有助于实现进一步找矿突破。
Abstract:
The North China block is one of the most important iron ore distribution areas in China. The high dependency on iron ore imports necessitates deeper research into iron ore mineralization laws, prospecting, and exploration. Guided by the theory of metallogenic series of ore deposits, taking geological age as the boundary,and incorporating the latest research on the tectonic evolution of the North China block, this study has identified six metallogenic series of iron ore deposits:（1） Metallogenic series（groups） of Fe deposits related to Archean marine volcanic sedimentary metamorphism in the North China block;（2） Metallogenic series（groups） of Fe deposits related to Paleoproterozoic magmas, volcanoes and sedimentary metamorphism in the east of the North China block;（3） Metallogenic series（groups） of Fe, Ti, and V deposits in the north of the North China block related to the magmatic sedimentation of Mesoproterozoic tectonic cycles;（4） Metallogenic series（groups） of Fe deposits related to Neoproterozoic magmatism and sedimentation in the east of the North China block;（5）Metallogenic series（groups） of Fe deposits related to Paleozoic volcanism sedimentation and sedimentation in the North China block;（6） Metallogenic series of Fe deposits related to Yanshanian magmatism in the central and eastern part of the North China block. Six metallogenic series constitute a relatively complete iron ore metallogenic pedigree in the North China block. Based on this research, this study proposes that iron ore exploration efforts should focus on five dimensions: geological unit, geological time, geological process, useful components, and deposit type combination. As a highly summarized result after in-depth study of typical deposits,the ore deposit type is also essential to prospecting work. A new understanding of the structures of key mines such as Bayan Obo, Chentaigou, Sijiaying and Xingshan will help achieve further breakthroughs in ore prospecting.
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