大興安嶺南段西坡隱爆角礫巖型多金屬礦床特征
[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.
【學位授予單位】:中國地質(zhì)大學(北京)
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:P618.2
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