赣东北朱溪钨铜矿床地质特征及成因探讨
发布时间：2018-12-18 02:34
【摘要】：江西景德镇朱溪钨铜矿床是近年来发现的一个世界级超大型钨铜矿床,隶属塔前-赋春多金属成矿带。先前的研究者对该矿床的地质特征、控矿构造特征及找矿方向进行了探讨,对矿床的地球化学、矿物学、同位素年代学等方面也进行了相关研究,成果颇丰。但是,由于成矿母岩体的多期次,成矿作用的多样性,铜钨矿化的差异性,导致对矿床成矿阶段及矿床成因方面的认识仍有争议,主要因为在岩浆与成矿的关系、成矿作用的类型与特点等方面的研究较为薄弱。随着勘查工作的深入,一些与成矿相关的地质体以及深部矿化现象不断被揭示,这为进一步完善对矿床成因的深入认识提供了重要基础。基于这一背景,对该矿床开展成矿作用特征的研究,既有深化成矿理论研究意义,又有指导下一步找矿的意义,因此笔者选择“赣东北朱溪钨铜矿床地质特征及成因探讨”为题进行专题研究。本文取得的主要研究成果如下:(1)矿体位于上石炭统黄龙组(C2h)大理岩与新元古代双桥山群(Pt3sh)变质岩之间的不整合界面之间。岩体-矿体-围岩在空间上具有显著的矿物组合分带特征。(2)根据矽卡岩矿物电子探针分析认为,石榴子石主要为钙铝榴石-钙铁榴石系列;辉石为透辉石-钙铁辉石系列,具典型钙矽卡岩特征。矽卡岩期可划分为4个阶段:矽卡岩阶段、退化蚀变阶段、石英-硫化物阶段、碳酸盐阶段。(3)碳、氢、氧、硫、铅同位素分析显示:碳的来源具有岩浆活动的特点,又受矽卡岩化交代作用影响而带有围岩地层的特征;氢-氧同位素组成具有岩浆水和大气降水混合的特点;硫的来源具有典型“岩浆硫”的特点,成矿时的热液体系显示为稳定平衡的状态;铅的来源主要为壳源。(4)通过对矿床地质特征的系统研究,认为钨矿化至少存在三期(145Ma左右为钨的主成矿时期),铜矿化至少存在两期(159Ma左右为铜的主成矿时期)。朱溪钨铜矿床的形成与多种成矿作用类型密切相关:以矽卡岩型、云英岩型、热液型为主,岩浆型为辅。铜矿的形成以热液脉型为主,矽卡岩型为次。(5)建立了朱溪钨铜矿床的成矿模式:朱溪钨铜矿床受多种构造作用控制,与多期次的岩浆-流体侵位相关,成矿物质和成矿流体的来源具有多样性,由多种成因的类型的成矿作用叠加而形成。
[Abstract]:The Zhuxi tungsten copper deposit in Jingdezhen, Jiangxi Province, is a world-class super large tungsten copper deposit discovered in recent years, which belongs to the Ta-Qian-Fu Chun polymetallic metallogenic belt. Previous researchers have discussed the geological characteristics, ore-controlling structural characteristics and prospecting direction of the deposit, and studied the geochemistry, mineralogy and isotopic chronology of the deposit. However, due to the multiple stages of ore-forming parent rock, the diversity of mineralization and the difference of copper and tungsten mineralization, there is still controversy about the metallogenic stage and genesis of the deposit, mainly because of the relationship between magma and mineralization. The study on the types and characteristics of mineralization is relatively weak. With the development of exploration, some ore-forming related geological bodies and deep mineralization phenomena have been revealed, which provides an important basis for further improving the understanding of ore deposit genesis. Based on this background, the study on the metallogenic characteristics of the ore deposit is of great significance both in deepening the study of metallogenic theory and in guiding the further exploration of ore deposits. Therefore, the author chooses "Geological characteristics and Genesis of Zhuxi Tungsten and Copper Deposit in Northeast Jiangxi Province" as a special topic. The main results obtained in this paper are as follows: (1) the orebody is located between the unconformable interface between the upper Carboniferous Huanglong formation (C2h) marble and the Neoproterozoic Shuangqiao Mountain Group (Pt3sh) metamorphic rocks. According to the electron probe analysis of skarn minerals, the pomegranate is mainly composed of calcium aluminite and calcium ferrite; Pyroxene is a series of diopside-Calciferopyroxene with typical calcium skarn characteristics. The skarn stage can be divided into four stages: skarn stage, degenerative alteration stage, quartz-sulfide stage, carbonate stage. (3) isotopic analysis of carbon, hydrogen, oxygen, sulfur and lead shows that the source of carbon is characterized by magmatic activity. Influenced by skarn metasomatism, it has the characteristics of surrounding rock strata. The hydrogen-oxygen isotopic composition has the characteristics of mixing magmatic water and atmospheric precipitation, the source of sulfur has the characteristic of typical "magmatic sulfur", and the hydrothermal system during mineralization shows a stable equilibrium state. (4) based on the systematic study of the geological characteristics of the deposit, it is concluded that there are at least three stages of tungsten mineralization (145Ma is the main metallogenic period of tungsten) and at least two periods of copper mineralization (159Ma is the main metallogenic period of copper). The formation of Zhuxi tungsten copper deposit is closely related to many types of mineralization: skarn type, quartz type, hydrothermal type and magmatic type. The formation of copper deposit is mainly hydrothermal vein type, and skarn type is secondary. (5) the metallogenic model of Zhuxi tungsten copper deposit is established. The deposit is controlled by various tectonic processes and is related to multiple magmatic fluid emplacement. The sources of ore-forming minerals and ore-forming fluids are diverse and are formed by the superposition of various genetic types of mineralization.
【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】：2017
【分类号】：P618.41;P618.67
[Abstract]:The Zhuxi tungsten copper deposit in Jingdezhen, Jiangxi Province, is a world-class super large tungsten copper deposit discovered in recent years, which belongs to the Ta-Qian-Fu Chun polymetallic metallogenic belt. Previous researchers have discussed the geological characteristics, ore-controlling structural characteristics and prospecting direction of the deposit, and studied the geochemistry, mineralogy and isotopic chronology of the deposit. However, due to the multiple stages of ore-forming parent rock, the diversity of mineralization and the difference of copper and tungsten mineralization, there is still controversy about the metallogenic stage and genesis of the deposit, mainly because of the relationship between magma and mineralization. The study on the types and characteristics of mineralization is relatively weak. With the development of exploration, some ore-forming related geological bodies and deep mineralization phenomena have been revealed, which provides an important basis for further improving the understanding of ore deposit genesis. Based on this background, the study on the metallogenic characteristics of the ore deposit is of great significance both in deepening the study of metallogenic theory and in guiding the further exploration of ore deposits. Therefore, the author chooses "Geological characteristics and Genesis of Zhuxi Tungsten and Copper Deposit in Northeast Jiangxi Province" as a special topic. The main results obtained in this paper are as follows: (1) the orebody is located between the unconformable interface between the upper Carboniferous Huanglong formation (C2h) marble and the Neoproterozoic Shuangqiao Mountain Group (Pt3sh) metamorphic rocks. According to the electron probe analysis of skarn minerals, the pomegranate is mainly composed of calcium aluminite and calcium ferrite; Pyroxene is a series of diopside-Calciferopyroxene with typical calcium skarn characteristics. The skarn stage can be divided into four stages: skarn stage, degenerative alteration stage, quartz-sulfide stage, carbonate stage. (3) isotopic analysis of carbon, hydrogen, oxygen, sulfur and lead shows that the source of carbon is characterized by magmatic activity. Influenced by skarn metasomatism, it has the characteristics of surrounding rock strata. The hydrogen-oxygen isotopic composition has the characteristics of mixing magmatic water and atmospheric precipitation, the source of sulfur has the characteristic of typical "magmatic sulfur", and the hydrothermal system during mineralization shows a stable equilibrium state. (4) based on the systematic study of the geological characteristics of the deposit, it is concluded that there are at least three stages of tungsten mineralization (145Ma is the main metallogenic period of tungsten) and at least two periods of copper mineralization (159Ma is the main metallogenic period of copper). The formation of Zhuxi tungsten copper deposit is closely related to many types of mineralization: skarn type, quartz type, hydrothermal type and magmatic type. The formation of copper deposit is mainly hydrothermal vein type, and skarn type is secondary. (5) the metallogenic model of Zhuxi tungsten copper deposit is established. The deposit is controlled by various tectonic processes and is related to multiple magmatic fluid emplacement. The sources of ore-forming minerals and ore-forming fluids are diverse and are formed by the superposition of various genetic types of mineralization.
【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】：2017
【分类号】：P618.41;P618.67
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