陕西省黄泥坪金矿床成矿规律研究

发布时间：2018-01-01 00:19

本文关键词：陕西省黄泥坪金矿床成矿规律研究　出处：《东华理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：陕西宁强县黄泥坪金矿区以阳平关大断裂为界分,地处南部的扬子地块北缘的后龙门山造山带内,为典型的石英脉(柳树坪矿段、石罐子矿段)、蚀变岩型(山关石矿段、汉树沟矿段)金矿床。依托“陕西省宁强县黄泥坪地区山关石—柳树坪—汉树沟—石罐子矿段金矿勘查”项目,以黄泥坪金矿为研究对象,对研究区的成矿地质特征及成因进行了详细剖析;通过研究矿床地质特征,分析矿体形成与地层、构造、岩浆岩及围岩蚀变之间的关系,探讨黄泥坪金矿成矿地质特征、控矿因素、成矿时代、成矿物质来源、矿床成因,提出黄泥坪金矿成矿模式。本次研究工作取得以下认识:黄泥坪金矿石中金主要分布在毒砂及黄铁矿之中,而黄铁矿中微量元素Ni含量较低,Co/Ni比值一般在1-3之间,独居石微粒中Ce2O3、La2O3含量均较高而Gd2O3含量较低,表明中低温热液交代成因特征明显。黄泥坪金矿的控矿构造不应局限于是地层还是断裂构造,应该统一看作能够为成矿流体提供富集空间的部位。研究区成矿空间上受到逆冲构造变形中期代产生的平移断层的控制,并受到晚期构造世代逆冲构造变形的掩覆。矿体多为隐伏、半隐伏矿体。黄泥坪金矿四个矿段矿体形态、矿石类型、载金矿物、围岩蚀变等特征相似,具有一定的亲缘关系,是后龙门山造山带燕山期成矿事件的结果。黄泥坪金矿应为韧性剪切型金矿,成矿流体为基底火山岩经韧性剪切作用活化而来,矿区深部有存在盲矿体的可能。黄泥坪金矿成矿机理总结为:燕山期华北板块与扬子陆块的陆陆碰撞发生由北向南的逆冲推覆,深部火山岩基底在韧性剪切作用下,使火山岩中金活化形成含金热液,含金热液沿着断裂向上迁移,到弱酸性低级变质的绿片岩相(沉积盖层)中的有利部位富集成矿。且区内金矿体中多含黄铁矿、毒砂、黄铜矿、黝铜矿、板钛矿、闪锌矿及赤铁矿以及次生氧化矿物褐铁矿等显示了中温热液矿物组合特征,初步认为该矿床成因应为中温热液蚀变岩型金矿床。
[Abstract]:Shaanxi Ningqiang County Wong Ping gold mine area to Yangpingguan fault as the boundary, the south is located in the northern margin of the Yangtze block of the Longmen orogenic belt, is a quartz vein (typical of the Liu Shuping ore section, stone pot ore section), altered rock type (Shan Guan ore section, Han Shu ditch mine). Relying on the "gold deposit in Ningqiang County in Shaanxi Province Huang Ni Ping Shan Guan Shi - ping area Chinese willow tree ditch - stone pot ore section gold exploration project, to Wong Ping gold mine as the research object, a detailed analysis of metallogenic characteristics and genesis of the study area; through the study of geological characteristics, formation and formation structural analysis, the relationship between magmatite orebody and wall rock alteration, investigate Huang Ni Ping gold metallogenic character, ore controlling factors, mineralization, genesis of ore forming material source, mineralization model, put forward Wong Ping. This study made the following understanding: Wong Ping gold in gold ore Mainly distributed in arsenopyrite and pyrite, pyrite and trace elements in low Ni Co/Ni ratio is generally between 1-3, Ce2O3 monazite, La2O3 content were higher and lower Gd2O3 content, indicating that the low temperature hydrothermal metasomatic characteristics. Ore controlling structure of yellow Dongping gold deposit should not be limited and stratum or fault construction should be unified as to provide space for the enrichment of ore-forming fluid parts. Mineralization of the area space controlled by strike slip fault thrusting deformation produced by the middle generation, and by the late tectonic generation thrusting deformation under. Ore bodies are mostly concealed, half concealed ore bodies. Morphology, Wong Ping gold mine four mine some types of ores, gold bearing minerals, rock alteration and other similar features, has a certain relationship, is after the Longmen orogenic belt in Yanshan metallogenic events. Wong Ping gold mine should be ductile shear Cut type gold deposit, the ore-forming fluid is the basement rock volcano by ductile shear activation to the deep mining area exist blind orebody may. Gold mineralization mechanism is summarized as Wong Ping Yanshan: North China and Yangtze Landmass collision occurred from north to South thrusting, deep volcano rock basement in toughness under shear, the volcano rock of gold bearing hydrothermal activation, hydrothermal gold upward migration along the fracture, to weak acidic low-grade metamorphic greenschist facies (sedimentary cover) favorable position in mineralization. The ore bodies and within the area containing pyrite, arsenopyrite, chalcopyrite, tetrahedrite, brookite. Sphalerite and hematite and limonite mineral secondary oxidation shows the mesothermal mineral assemblage, it is considered that the gold deposit of altered rock type gold deposit is a mesothermal alteration.

【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P618.51

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