山东省禹城市叠道富铁矿床的发现及找矿意义
沈立军 , 王怀洪 , 张招崇 , 周明磊 , 朱裕振 , 吕云鹤 , 刘雪 , 孙超 , 张文艳
地学前缘 ›› 2026, Vol. 33 ›› Issue (5) : 260 -270.
山东省禹城市叠道富铁矿床的发现及找矿意义
Discovery and prospecting significance of Diedao high-grade skarn iron deposit in Yucheng City, Shandong Province
叠道富铁矿床位于华北板块鲁西隆起西北缘,是2023年新发现的夕卡岩型富铁矿床。矿床内富磁铁矿体呈似层状赋存于岩体与石炭系—二叠系接触带附近的含煤地层内,矿体与围岩接触较为截然;矿石矿物以磁铁矿为主,成矿元素集中,全铁含量约55%,Cu、Co等含量较低,Co与S含量显示较好的一致性。围岩蚀变以角岩化为主,夕卡岩化次之;为典型的“禹城式”夕卡岩型富铁矿床。成矿岩体为富镁、贫铁、贫钛、富钠过铝质岩石,钠长石化发育,蚀变过程中析出部分铁可能参与成矿;岩体较高的侵入层位促进了含矿热液的异地迁移富集成矿。该矿床为低缓磁异常内局部次级异常找矿成果,二维地震或广域电磁约束重磁反演,可有效识别矿致异常和岩体凸起异常,提高找矿成功率。异常东南及东部可能存在矿体剥蚀区,西侧具有较大的找矿空间。
The Diedao iron deposit, newly discovered in 2023, is located on the northwestern margin of the Luxi Uplift, North China Craton. It is a high-grade skarn-type iron deposit. The high-grade iron orebodies exhibit sharp contacts with the surrounding rocks and are stratified within the coal-bearing strata adjacent to the contact zone between the intrusive rock mass and the Carboniferous-Permian strata. The ore has a total iron content of approximately 55% and is dominated by magnetite. The mineralization is predominantly iron, with notably low concentrations of Cu, Co, and other elements. Cobalt and sulfur show consistent variation trends. The characteristics of the ore bodies identify it as a typical “Yucheng-type” high-grade skarn iron deposit. The ore-forming intrusive rocks are peraluminous and characterized by high Mg and Na but low Fe and Ti contents. Strong albitization is widespread in the adjacent rock mass, and this alteration process may have contributed some iron to the mineralization. The relatively high emplacement level of the intrusion facilitated the long-distance migration and subsequent mineralization of the ore-bearing hydrothermal fluids. The deposit is associated with a secondary, low-amplitude, and gentle magnetic anomaly. Integrated geophysical exploration, combining gravity and magnetic profile inversion with either 2D seismic or wide-field electromagnetic methods, can effectively distinguish magnetic anomalies caused by ore bodies and intrusive rock mass protrusions, thereby improving prospecting success rates. While the orebodies in the southeastern and eastern parts of the Diedao anomaly may have been eroded, the western area offers broader prospecting potential.
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国家重点研发计划项目(2022YFC2903705)
山东省自然科学基金项目(ZR2022QD073)
自然资源部2024年度部省合作项目(2024ZRBSHZ132)
山东省煤田地质局科研专项(MTDZKY-2024-02)
山东省省级地质勘查项目(鲁勘字(2022)25号)
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