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“新余式”铁矿是广泛分布于华南地区的重要新元古界铁建造,矿体和围岩在形成后经历了强烈变质和变形作用,部分矿区的矿体还受到了后期花岗岩体的强烈热液叠加作用。本文在对“新余式”铁矿的代表性矿床—良山铁矿进行野外考察和岩相分析的基础上,分别选择远离和靠近花岗岩体的矿石样品,开展磁铁矿微区和微量元素分析。研究表明,虽然两种矿石都受到不同程度的变质重结晶和热液叠加作用,但前者仍然保留了大量沉积变质期的赤铁矿,后者中的赤铁矿全部转变为磁铁矿。良山矿石中磁铁矿相对富集Ti、V、Mn、Co,贫Cr,与沉积变质铁矿的分配特征一致,其中靠近花岗岩体的样品相对富集Ti、V、Ni、Zn和Cu,显示中高温热液叠加特征。本文提出了新余良山铁矿的三阶段成矿模型,即深海硅铁质沉积、埋藏变质变形和花岗热液叠加。
The “Xinyu” iron ore is an important Neoproterozoic iron deposit widely distributed in South China. The ore body and the surrounding rock experienced strong metamorphism and deformation after their formation. Some of the ore bodies in the ore area were also affected by the later granite bodies Intense hydrothermal superposition. Based on field investigation and lithofacies analysis of Liangshan Iron Mine, a representative mineral deposit of “Xinyu” iron ore, the samples of ore away from and near the granite are respectively selected to carry out micro-area and trace amount of magnetite Elemental analysis. The results show that although both types of ore are subject to metamorphic recrystallization and hydrothermal superposition, the former still retain a large amount of hematite deposited during the metamorphism, while the latter all transform into hematite. The magnetite in Liangshan ore is relatively enriched in Ti, V, Mn, Co and Cr, which is consistent with the distribution characteristics of the metamorphic iron deposits. The samples near the granite are relatively rich in Ti, V, Ni, Zn and Cu, Show the high temperature hydrothermal superposition characteristics. This paper presents a three-stage metallogenetic model of the Xinyu Liangshan Iron Mine, namely, deep-sea ferrosilicon deposition, metamorphism and granite hydrothermal superposition.