【作者】 程广国；

【导师】 王京彬；

【作者基本信息】 中国地质大学（北京） ， 矿物学、岩石学、矿床学， 2013， 博士

【摘要】 本文简要叙述了熊耳山西段成矿区的区域地质、地球物理、地球化学背景；对熊耳山西段银铅锌多金属矿田的地层、构造、岩浆岩、地球物理、地球化学等矿田地质特征进行了总结,重点阐述了变质核杂岩的控岩控矿特征,通过对燕山期花岗岩的地质学、岩石学、岩石地球化学、微量元素及稀土元素等特征的研究,判断花岗岩为下地壳物质部分熔融的成因并经历了上部地壳物质的混染,利用稀土元素部分熔融数学定量模型进行了模拟,表明太华群经30%的部分熔融即可形成区内的燕山期花岗岩,本区花岗岩其构造环境为造山期后型；矿田地球物理特征方面重力低异常指示隐伏岩体的存在,激电异常能够较准确地指示银铅矿体的产状及矿化规模；地球化学特征表明本区处于成矿背景极佳的地球化学富集区,以寨凹岩体环形高温元素组合异常为中心,周边分布着东、北、南三个次级环形中低温元素组合异常中心；通过对铁炉坪、蒿坪沟、沙沟典型矿床的矿区地质特征、矿(化)体及矿体特征、矿石结构构造、成矿阶段、围岩蚀变的研究,本区银铅锌矿床的总体特征可概括为矿脉规模较大,单个矿体长度小,厚度薄,银品位较高,矿石结构构造较简单,成矿阶段可分为三个阶段,围岩蚀变以矿脉为中心对称发育,中心以硅化为主；矿床明显受地层、构造控制；主要成矿时间为燕山期且紧随Ⅰ型花岗岩侵入之后；矿床属中低温、低盐度、浅成矿床：矿石铅同位素、硫同位素、氢氧同位素均支持岩浆和大气水混合的观点；在系统总结了矿床勘查工作的基础上,形成了不同比例尺层次下的对预测区、靶区、矿脉进行勘查的矿床勘查模型；通过基于MRAS系统的银资源潜力评价分析,估算了全区银资源总量,并划分A类远景预测区1个,B类远景预测区2个,C类远景预测区1个更多还原

【Abstract】 The dissertation briefly describes the regional geology, geophysical and geochemical background of western Xiong’er metallogenic province, summarizes the Ag-Pb-Zn polymetallic ore field geological characteristics of strata, structure, magma, geophysics and geochemistry etc. Especially expounds the rock and mineralization controlling characteristics of metamorphic core complex. After studying the Yanshanian period granite geology, petrology, rock geochemistry, trace and REE earth elements etc, making sure that the granite were formed by the partially melting of lower crust and then contaminated by upper crust. The REE partially melting mathematic quantitative model simulation showing that the Yanshanian period granite with post-orogenic type tectonic environment background comes from the30%melting of Taihua group rock. In geophysical aspect, gravity low anomalies indicates the existence of concealed rock bodies while IP anomalies accurately indicates the occurrence and mineralization scale of Ag-Pb ore bodies. In geochemical aspect, this region is in the excellent metallogenic background geochemical enrichment zone which centers on Zhaiwa rock annular high temperature element composite anomalies and revolve around by three secondary ring-shaped middle and low temperature element composite anomalies in east, north and south direction. By researching geological, mineralization, ore structure, metallogenic stage and wall rock alteration characteristics of typical deposits such as Tieluping, Haopinggou and Shagou, summarising that the Ag-Pb-Zn deposit general characteristics are larger veins, thin and shorter single ore body with higher Ag grade. The ore structure is relatively simple and the metallogenic stage can be divided into three stages. The wall rock alteration are symmetric development centers on veins with siliconization mainly. Deposite is obviously controlled by the geological structure and can be classed as low temperature, low salinity and hypabyssal deposite. The main metallogenic time is Yanshanian period with immediately after the I-type granite intrusion. The ore Pb, S, H and O isotope studying resultes all support magmatic and meteoric water mixture viewpoint. Based on system summary of the deposit exploration, building the prospecting models in this area. Through evaluation and studying the Ag resources potentiality based on MRAS system, estimation the Ag resource in this region, then proposing1A category target,2B category targets and1C category target.更多还原