胶西北罗山金矿床蚀变—矿化网络结构

发布时间：2018-03-27 05:33

  本文选题：罗山金矿床　切入点：破头青断裂　出处：《中国地质大学(北京)》2015年硕士论文

【摘要】：罗山金矿床位于胶西北玲珑金矿田南部破头青断裂与九曲蒋家断裂的交汇处,是玲珑金矿田典型的蚀变岩型矿床。近年来,随着浅中部已经被采空,该矿床保有储量急剧下降。矿化网络是成矿系统应用于预测找矿的重要环节,为更深入的认识金矿床、扩大其资源储量并延长其服务年限,对其进行蚀变-矿化网络结构研究,服务于该矿床的深部找矿工作。论文以系统的野外地质观测和矿床探采资料为基础,对罗山金矿床控矿构造、蚀变分带及矿化网络结构进行了研究。罗山金矿主要受断裂控制,破头青断裂与次级控矿断裂或节理裂隙分别控制了蚀变岩型矿体和多金属硫化物脉型矿体的形态及产状。控矿断裂经历了四期变形演化:早期韧性剪切变形、成矿前韧-脆性剪切变形、成矿期张剪脆性变形及成矿后压剪脆性变形。围岩蚀变主要受破头青断裂控制,在水平方向整体具有明显的分带性,自主断裂向下盘方向蚀变带总体为:断层泥→黄铁绢英岩→绢英岩→钾化花岗岩→新鲜花岗岩的渐变趋势。而由于受次级断裂和节理裂隙影响,在局部地段出现蚀变叠加。依据各蚀变带包含及穿插关系厘定蚀变时序为:钾长石化→绢英岩化→黄铁矿化→碳酸盐化。依据质量平衡分析,蚀变过程中:主量元素Si、K、Fe、Al元素主要为迁入,Na元素迁出;微量元素Ba、Sr、Cu和Ag表现活跃,其次为Au、Pb、Rb和Zn;其中Ba、Sr明显迁出,Au元素与Cu、Pb、Rb、Zn均为迁入,表明多金属硫化物与矿化作用同阶段。矿化在水平方向上具有渐变规律,从主断裂面近旁的挤压片理带至远离断面的节理带,矿化类型也出现由破碎蚀变岩型矿化带至多金属硫化物脉型矿化带变化。蚀变岩型矿化主要赋存于压扭性的破头青断裂破碎带内,而脉型矿化多发育在主断裂下盘的次级张性、张扭性断裂-节理带中。断裂-裂隙系统的多期次活动、不同部位的变性差异及其中对应成矿流体的输运-反应-沉淀等的变化导致了蚀变-矿化多样性及其网络结构的形成。
[Abstract]:At the junction of Luoshan gold deposit is located in the northwest of Linglong gold field in southern potouqing fault and nine Jiangjia fracture, is typical of the Linglong gold deposit of altered rock type gold deposit. In recent years, with the shallow middle has been mined, the deposit reserves fell sharply. The mineralization network is an important part of the metallogenic system applied to forecast the prospecting for gold deposits, more in-depth understanding, expand its reserves and prolong its service life, study the mineralization alteration of its network structure, deep prospecting work in the service of the deposit. The deposit and geological observation system based on data mining, the Luoshan gold deposit control the ore structure, alteration and mineralization network structure were studied. The gold deposits of Luoshan mainly controlled by faults, potouqing fault and secondary ore controlling faults or fissures respectively controlled altered rock type ore bodies and polymetallic sulfide vein type ore body The morphology and occurrence. Ore controlling fracture has experienced four stages of evolution: the early deformation of ductile shear deformation before mineralization of ductile brittle shear deformation, tensile shear deformation and brittle mineralization mineralization after shear brittle deformation. Wall rock alteration is mainly affected by the potouqing fault control has obvious zonation in the horizontal direction. Independent fracture to footwall alteration zone for the overall direction: the gradual trend of fault gouge, pyrite sericite quartz rock, phyllic, potassic granite to fresh granite. Due to secondary faults and fissures, appear superimposed alteration in the local area. On the basis of the alteration zone contains and define the relation between alteration with timing for potash feldspathization, sericitization, pyritization and carbonatization. Based on the analysis of the mass balance, the alteration of the main elements: Si, K, Fe, immigration elements are mainly Al, Na elements from; trace elements Ba, Sr, Cu and Ag showed active, followed by Au, Pb, Rb and Zn; Ba, Sr were moved out, Au element and Cu, Pb, Rb, Zn were moved, that polymetallic sulfide mineralization and mineralization stage. The same has change rule in the horizontal direction, near surface compressional schistosity belt to far away from the joint section from the main fracture zone, mineralization types are also by the altered rock type mineralization belt to metal sulfide vein type mineralization changes. The altered rock type mineralization occurs mainly in the potouqing shear fracture zone, secondary tensile and vein type mineralization in the development of the main fault footwall, joint transtensional fault zone fault -. Fracture system multi period activities, and the degeneration of different position corresponding to the change of the ore-forming fluid transport reaction precipitation resulted in the formation of alteration and mineralization diversity and network structure.

【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】：2015
【分类号】：P618.51

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