钦杭带南段庞西垌-金山银金矿田控矿构造分析及找矿指示

发布时间：2018-06-13 01:54

本文选题：地质学 + 银-金矿　；参考：《矿床地质》2017年04期

【摘要】：钦杭成矿带南段的庞西垌-金山银金矿田位于粤东与桂西交界处,包括庞西垌、金山、中苏、竹根坡、高村等银金矿床及一系列银金矿点,是20世纪80年代规划的十大银矿基地之一。庞西垌地区经历了多期的构造-岩浆活动,韧性剪切带和断裂构造尤其发育。印支期以来,可识别出3期主要构造:第一期为右行韧性剪切,前人利用糜棱岩中白云母测得时代为221 Ma;第二期为左行韧脆性剪切,北东向的庞西垌-金山断裂带反映最为突出,切过燕山晚期花岗岩;第三期为脆性走滑。银金矿体及矿石结构、构造主要受第二期左行韧脆性剪切带控制。应用里德尔剪切体系对控矿构造的分布特征分析显示,银金矿脉主要赋存于里德尔体系的D、R和T裂隙中;D裂隙是最重要的赋矿构造,热液蚀变岩型和石英脉型矿体呈透镜状左行斜列于主断裂面中,沿走向往南西侧伏;R和T裂隙主要发育梳状含金石英脉。R裂隙呈密集剪破裂产出,与主断裂面夹角15°~35°;T裂隙呈雁列状等距分布,与主断裂面夹角约为45°。这些矿脉就位体系,可以为该区进一步找矿作参考。
[Abstract]:The Pangxidong-Jinshan silver ore field in the southern section of the Qinghang metallogenic belt is located at the junction of eastern Guangdong and western Guangxi, including Pang Xidong, Jinshan, Zhongsu, Zhugenpo, Gaocun, and a series of silver and gold deposits. It is one of the ten silver mine bases planned in the 1980 s. Pangxidong area experienced multiple tectonic-magmatic activities, especially ductile shear zone and fault structure. Since the Indosinian period, three major structures have been identified: the first stage is right-line ductile shear, the previous dating of Muscovite in mylonite is 221 Ma, and the second stage is left row ductile brittle shear. The Pangxidong-Jinshan fault zone in the NE direction is the most prominent, cutting through the late Yanshanian granite, and the third stage is brittle strike-slip. The structure and structure of the silver gold deposit are mainly controlled by the second stage left ductile brittle shear zone. The analysis of the distribution characteristics of ore-controlling structures by using the Riedel shear system shows that the silver and gold veins are the most important ore-hosting structures, mainly in the DUR and T fissures of the Rydell system, in which the D fissures are the most important ore-bearing structures. The orebodies of hydrothermal altered rock type and quartz vein type are lenticular left line oblique in the main fault surface. Along the west side of the main fault plane, the carding quartz vein and T fissures are mainly formed by comb quartz vein. The angle between the fracture and the main fault surface is 15 掳and 35 掳T fissures are geese equidistant, and the angle with the main fault surface is about 45 掳. These ore-vein emplacement systems can be used as a reference for further prospecting in this area.
【作者单位】：中山大学地球科学与地质工程学院;中国科学院广州地球化学研究所矿物学与成矿学重点实验室;广东省海洋地质调查院;
【基金】：国家自然科学基金(编号:41502070) 中国科学院矿物与成矿重点实验室开放基金(编号:KLMM20150204) 中国地质调查局工作项目(编号:1212011120831、1212011085412)资助
【分类号】：P618.5

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