【作者】 王永磊；

【导师】 裴荣富；

【作者基本信息】 中国地质科学院 ， 矿产普查与勘探， 2008， 博士

【摘要】 湘南钨锡多金属矿集区位于南岭海西期坳陷带的东段,是南岭成矿区中生代岩浆活动与成矿作用的重要组成部分,其优势矿产钨、锡、铋等在全国乃至全球占有举足轻重的地位。本文通过深入剖析和系统对比矿集区内不同成矿花岗岩体的地球化学特征、岩浆物质来源、形成机制及典型矿床的成矿地质特征,重新认识了湘南钨锡多金属矿集区燕山期花岗质岩浆活动、流体作用与成矿过程,建立了岩浆侵入接触构造体系概念模型,在以下几个方面取得了一些重要进展:1.通过对区内多个典型花岗岩体的岩石学、地球化学研究,探讨了与钨锡成矿有关的花岗岩形成的构造环境和成因模式,认为燕山早期花岗岩岩体为本区的钨锡成矿提供了重要的物质来源。2.对区内花岗岩体的成分分异特征进行了研究,尤其探讨了流体分异及F、Cl等挥发组分对花岗岩成分分异及成矿的影响。3.根据区内典型花岗岩体的含矿特征,初步分析了不同成矿花岗岩体的地球化学特征,探讨了花岗岩体的成矿专属性。4.通过区内典型钨锡矿床流体包裹体研究,系统的分析了不同矿床、不同矿石类型中流体包裹体的显微特征,比较了它们在成矿特征、成矿流体体系、成矿物理化学条件上的异同,初步查明了成矿流体的特征,并探讨了不同成矿流体对成矿的影响。5.通过含矿蚀变岩的稀土、微量元素及矿石铅同位素分析,初步查明了燕山期钨锡成矿物质来源。6.利用辉钼矿Re-Os同位素体系对瑶岗仙钨矿进行了高精度的成矿年龄测定,重新厘定了瑶岗仙钨矿的成矿时代,并探讨了其成矿作用持续的时间。7.在区内成矿地质条件、成矿规律、成矿地球化学特征与岩浆侵入过程时空耦合关系的综合研究基础上,建立了岩浆侵入接触构造体系控矿模式。更多还原

【Abstract】 As an important part of the Nanling Mesozoic magmatic-metallogenci belt, the W-Sn polymetallic ore concentration area in Southern Hunan Province is located at the east section of Nanling Hercynian depression zone, which superior mineral resources, such as tungsten, tin and bismuth etc., occupy a decisive position in the country, even all over the word. By thorough analysis and systemic comparison of the typical deposits and magamtic plutons, especially geochemistry of different metallogenetic granites, the source formation mechanism of granitic magma, as well as including composition and character of ore-forming fluids, the author re-recognized Yanshanian magmatic activity, ore-forming fluid action and mineralization process in Southern Hunan Province, and established the conceptual model of the magmatic intrusive contact structural system. The following are the major progresses.1. Based on the study of petrology and geochemical characteristics of the typical granites, the tectonic environment and genesis of metallogenetic granites are discussed , and it is proposed that a large part of materials for mineralization might be derived from the Early Yanshanian granites.2. Differentiation characteristics of chemical compositions of the granites are studied, especially the influence on the granitic differentiation and mineralization of the volatile components.3. By analyzing the geochemical characteristics of different metallogenetic granites, the metallogenetic specialization of different granites is preliminarily discussed.4. Fluid inclusion measurement leads to preliminary ascertaining characteristics of the ore-forming fluids of different deposit and reflecting the different influence on the mineralization of the different fluids.5. The ore-forming material source is found out through analyzing lead isotopic, rare earth elements and trace elements of altered rocks.6. The mineralization age of Yaogangxian tungsten deposit is measured by using Re-Os dating of molybdenite, and the duration of mineralization is studied.7. A conceptual model of the magmatic intrusive contact structural system is set up on the basis of the researches on ore-forming geological conditions, metallogenic regularity, ore-forming geochemical characters, and the spatiotemporal coupling relationship with magma intrusive process.更多还原