大兴安岭南段西坡隐爆角砾岩型多金属矿床特征

发布时间：2018-09-17 15:34

【摘要】：大兴安岭南段是我国重要的多金属成矿带,多为热液脉型和夕卡岩型矿床,而隐爆角砾岩型矿床极少。近年在大兴岭南段西坡的维拉斯托和边家大院矿区均发现了含矿隐爆角砾岩筒,其为隐伏石英斑岩体侵位的直接产物。隐爆角砾岩型矿化主要受隐爆角砾岩筒的控制,通过对隐爆角砾岩型矿床矿体出露特征、岩相分带以及成矿特征研究,认为隐爆角砾岩筒作为成矿流体汇聚、成矿物质卸载沉淀的重要场所,并且与斑岩型矿床以及浅成低温热液脉型矿床的关系密切,构成了一个完整的成矿系统。两个矿区内隐爆角砾岩构造是最新发现的一种控矿构造,出露在矿区西部小山上,面积均不大,呈圆筒状,角砾岩筒风化后呈黄褐色,褐铁矿化强烈,角砾主要有围岩地层角砾和岩体角砾两种,呈棱角、尖角状,角砾大小不等,角砾被含矿热液胶结,矿化主要分布于角砾岩的胶结物中,偶见原生的闪锌矿化,具有典型的隐爆角砾岩特征。对隐爆角砾岩筒的成因机制进行了总结,认为岩浆上侵→气液聚集→高压隐爆→岩石碎裂→矿液注入→富集成矿。隐爆角砾岩筒的确定对寻找该矿区的成矿地质体具有重要意义,确定出岩体顶部的内外接触带、隐爆角砾岩筒是成矿结构面,研究了成矿规律,构建了“三位一体”找矿模型。综合物化探资料,对隐爆角砾岩型矿进行了成矿预测,指出了成矿远景区,从而指导找矿及探矿工程部署。
[Abstract]:The southern part of the Daxinganling Mountains is an important polymetallic metallogenic belt in China, mostly hydrothermal vein type and skarn type deposits, while crypto-explosive breccia deposits are rare. In recent years, the ore-bearing crypto-explosive breccia barrel has been found in the west slope of the Lingnan section of Daxing, Virasto and the Bian Jia Yuan mining area, which is the direct product of the emplacement of the concealed quartz porphyry. The mineralization of crypto-explosive breccia type is mainly controlled by the crypto-explosive breccia tube. Through the study of the orebody exposure characteristics, lithofacies zoning and metallogenic characteristics of the crypto-explosive breccia type deposit, it is considered that the crypto-explosive breccia tube converges as a ore-forming fluid. The important place where the ore-forming material is unloaded and precipitated is closely related to the porphyry deposit and the epithermal hydrothermal vein type deposit, forming a complete metallogenic system. The implosion breccia structure in the two mining areas is a newly discovered ore-controlling structure. It is exposed on the hills in the west of the mining area, with a small area and a cylindrical shape. The breccia tube is weathered in yellowish brown, and limonite is strongly densified. There are two kinds of breccia: the surrounding rock stratum breccia and the rock mass breccia. The breccia is angled, sharp, breccia is different in size, the breccia is cemented by ore-bearing hydrothermal solution, the mineralization is mainly distributed in the cementation of breccia, and the primary sphalerite is occasionally seen. It is characterized by typical cryptoexplosive breccia. The genetic mechanism of the crypto-explosive breccia tube is summarized. It is considered that the magmatic gas permeating fluid accumulates and high pressure crypto-explosive rock fragmentation fluid injects to enrich the ore forming. The determination of crypto-explosive breccia tube is of great significance in finding the ore-forming geological body of the mining area. The inner and outer contact zone at the top of the rock mass is determined. The crypto-explosive breccia tube is the ore-forming structural plane. The metallogenic law is studied, and the "trinity" prospecting model is constructed. Based on the comprehensive geophysical and geochemical data, the ore-forming prediction of crypto-explosive breccia type ore is carried out, and the metallogenic prospect is pointed out, thus guiding the prospecting and prospecting engineering deployment.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.2

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