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晋北地区构造与次火山岩成矿系统研究
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摘要
晋北地区属于恒山—五台山的太行山系,位于华北古陆的北缘与内蒙地块(内蒙地轴)、燕辽裂陷槽(陆内裂陷带)的交汇部位,构造复杂,岩浆岩发育,各种成矿条件有利。本文从区域地质入手,贯穿构造—控岩—控矿主线,采用区域成矿学的理论和方法,将成矿作用与区域地质演化有机地联系起来,在充分现场调查研究的基础上,研究晋北地区构造与次火山岩成矿系统。
     论文概述了晋北地区区域地质构造及其演化、区域构造对各种矿产的控制,并依据晋北地区断裂构造的分布特征提出网络状断裂体系,分别研究了主网络状断裂体系和次网络状断裂体系的控岩、控矿特征,提出了主网络状断裂体系控制了区内地层和岩浆岩的分布,是主要控岩构造体系;次网络状断裂体系主要为导矿构造和储矿构造。
     系统阐述了晋北地区燕山期次火山岩的分布规律、岩体地质特征、岩石及岩石化学特征、岩石稀土和同位素等地球化学特征,并根据成因类型、岩石组合、矿物成分、岩石化学、微量元素、稀土元素、同位素、成矿特征等分析将燕山期次火山岩岩类划分为两大系列和9个类型。
     按壳源型、壳幔过渡同熔型两大系列分别系统论述了晋北地区燕山期次火山岩成矿特征,并重点对壳幔过渡同熔型系列中的斑岩、角砾状次火山岩、复式岩株等成矿特征和典型矿床进行了剖析。
     构建了晋北地区构造与次火山岩成矿系统结构、矿化网络图,并系统论述了构造与次火山岩成矿系统,提出循环成岩成矿作用的概念和初步观点。
     针对研究区内与燕山期次火山岩有关的矽卡岩型和角砾状次火山岩型两个重要成矿类型的矿床成因提出新认识,对刁泉银铜矿和支家地银矿等典型矿床分别建立了成矿模式,并在地质工作中得到实际应用。
The north region of Shanxi, which belongs to Hengshan-Wutaishan mountain system, locates in the intersection region among the north of Huabei ancient continent, the Inner Mongolian crustal block(the Inner Mongolian earth axis) and Yanliao taphrogenic trough(rift belt). In the region, there are good metallogenic conditions due to the complex geology structure and the wide distribution of magmatite. In this dissertation, by studying the structure and its control on rock and mineral, the region geology structure and sub-volcanic rock system are studied on basis of the great deal of fieldwork by the regional metallogenesis theory.Firstly, regional geology structure, its evolution, and its control on various minerals are summarized in study area and the conception of the net fault system is presented through studying the distribution character of structure in the north region of Shanxi. According to the character of control on rock and mineral of the primary net fault and the secondary net fault system, a conclusion is summeried that the regional strata and the magmatic distribution are controlled by the primary net fault system which is the main control-rock structural system, and the transmitting mineral structure and mineral reserve structure is mainly controlled by the secondary net fault system.Secondly, the distribution character of the sub-volcanic rock of Yanshan period, the geology character of rock body, the chemical character of rock and the geochemical character of rare-earth elements and isotopic elements are explained systemically and the sub-volcanic rocks in the stage of Yanshan is grouped under nine heads and two series according to its genesis, the assembly of rock, the mineral component, its rock chemical, the trace element, the rare-earth element and the isotope, et al.Lastly, metallogenesis system of sub-volcanic rock in the stage of Yanshan is discussed in terms of crust-source and crust & mantle-source, and representative mineral deposit and metallogenesis system of porphyry, breccia subvolcanic rocks and multi-stock, which fall into crust & mantle-source, are explained.The structure,the sub-volcanic metallogenesis system framework map and the mineralization network map are constituted.Structure and the sub-volcanic metallogenesis system are discussed systemically,then the concept of the circular diagenesis-mineralization and the elementary standpoint are put forward.In this paper, the author bringes forward a new genetic idea of the deposit about skarn ore deposit and breccia sub-volcanic deposit related to the sub-volcanic rock in the stage of Yanshan in the study area.Furthermore, the author establishes the metallogenesis model for the Diaoquan silver & copper deposit and the Zhijiadi silver deposit, and has applied the idea to the actual geological works.
引文
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