广西六琼矿区热泉型金矿床网脉-角砾岩特征及其成因探讨  

Breccia-Vein System of Liuqiong Hot Spring Type Gold Deposit,Guangxi: Characteristics and Genesis

作　　者：汤静如[1,2] 叶琳[2] 莫志明[2] 

机构地区：[1]桂林理工大学有色及贵金属隐伏矿床勘查教育部工程研究中心,广西桂林541004 [2]桂林理工大学广西地质工程中心重点实验室,广西桂林541004

出　　处：《桂林工学院学报》2009年第3期277-284,共8页Journal of Guilin University of Technology

基　　金：广西自然科学基金资助项目(桂科自0832251);广西地质工程中心重点实验室开放基金资助项目(桂科能07109011-K016)

摘　　要：六琼金矿区内有Ⅰ、Ⅱ、Ⅲ号3个热泉型含金矿化体,在平面上均呈透镜状,产于断裂带附近并沿断裂走向断续分布,矿化体内岩石为流体动力角砾岩。按蚀变类型不同,矿区内流体动力角砾岩可分为2个系列:铁系列和硅系列的流化角砾岩和液压角砾岩。组成热泉构造的网脉-角砾岩系具有明显的构造分带性,从中心向两侧依次为:管道相流化角砾岩→中间相液压角砾岩→边缘相初液压角砾岩和网脉状矿化体→正常围岩。褐铁矿矿化强度由管道相向边缘相逐渐减弱,金矿化在管道相内不发育,在中间相和边缘相发育较好,由中间相向边缘相金矿化逐渐减弱。控泉断裂受地震脉动机制释放应力控制;热泉构造受构造泵吸和液压致裂作用控制,多次构造-流体事件产生的裂开-愈合作用形成了具有构造分带的网脉-角砾岩系的热泉型成矿构造。The Liuqiong hot spring type gold deposit consists of three lenticular orebodies（No.I,No.II,and No.III）existing in proximity to the faults zone and trace the surface trend of the faults.Gold ores are largely composed of fluid dynamic breccias that,in light of the alteration and hydrothermal cements,fall into 2 types： fluidized breccias and hydrofracturing breccias of iron series and silicon series.The stockwork and breccias display excellent planer zonation,marked by fluidized breccias in the center,hydrofracturing breccias in the transitional zone,and incipient hydrofracturing breccias in the marginal area.Limonite is most intensely developed in the center of the breccia-vein system,whereas strongest gold mineralization is observed in the transitional and marginal zones,with the central part lack of gold.The vein-breccias are interpreted to be controlled by the mechanism of earthquake pumping acting in the faults and hydraulic fracturing in the extensional segments of the faults driven by overpressurized fluids.The episodic faulting and hydraulic fracturing resulted in repeated cracking-sealing of the veins that cement the breccias,forming the zonation of the breccia-vein system.

关 键 词：热泉构造 流体动力角砾岩 构造分带 液压致裂 六琼金矿 广西 

分 类 号：P613[天文地球—矿床学] P618.51[天文地球—地质学]