安徽霍邱李老庄铁矿-菱镁矿矿床地质特征及矿床成因类型

Geological characteristics and metallogenic types of the Lilaozhuang iron-magnesite deposit in Huoqiu,Anhui

霍邱铁矿田位于华北地台南缘,处于北淮阳山字型构造脊柱部位,李老庄铁矿-菱镁矿床置于霍邱铁矿田中部。该矿床主要产于上太古界霍邱群变质岩系中,矿体赋存于富镁碳酸盐岩中,矿石类型可以分为菱镁矿磁铁矿石和蛇纹石磁铁矿石,各占25%。成矿物质来源于这些变质岩系的多层、分散的含铁建造矿源层中。依据矿床地质特征,结合矿石同位素地质和测年结果,并进行综合分析后认为,李老庄铁矿-菱镁矿矿床为一晚太古代海相火山-沉积变质型矿床。

The Huoqiu iron ore field with the Lilaozhuang iron-magnesite deposit occurring in its middle part is located on the southern border of North China platform, on the spine of the ψ-type structure of the North Huiyang tectonic belt. This deposit occurs mainly in the metamorphic series of the Huoqiu group in Upper Archean Erathem with its ore body occurred in Mg-rich carbonate rocks, besides the ore types can be classified as magnesite-magnetite type and serpentine-magnetite type, each occupying 25 % respectively. Oreforming matters originated from the ore-sources strata with iron-bearing formation in these metamorphic series, which are dispersing and distributed in muhilayers. According to a comprehensive analysis of the geological characteristics of the deposit, combined with the conclusion of isotope geology and chronology, it has believed that the Lilaozhuang iron-mangnisite deposit is a marine volcanic-sedimentary metamorphic deposit in Late Archeozoic.