摘要
南岭九龙脑矿田淘锡坑钨矿是赣南地区典型的石英脉型黑钨矿床,受断裂构造与花岗岩体控制。本文通过8个中段坑道填图,结合地表钻和坑内钻揭露,对含矿石英脉、矿脉组、矿体以及成矿花岗岩体的几何形态、结构构造进行仔细观测,统计矿脉及成矿后断裂产状并进行构造解析。淘锡坑黑钨矿石英脉矿体整体呈平直长板状,具有尖灭侧现,单脉之间以左行斜列为主,而矿脉组呈菱形网格状排列等特征;花岗岩体呈矩形块状、阶梯状。岩突以顶蚀和岩墙扩展两种方式由南东向北西侵位。矿床为多期多阶段的成岩成矿,断裂对花岗岩的侵位与成矿起到主导控制作用。本文综合分析并构建了淘锡坑钨矿构造-岩浆的成矿演化模式,即区域构造应力作用生成共轭断裂构造网格体系,然后岩浆侵位上拱被共轭断裂切割的"几何体"围岩移位而侵位,并沿共轭断裂体系内充填云英岩脉、含矿石英脉体,完成一次成岩成矿作用;区域构造再次活动使围岩与花岗岩体发生断裂,并再次诱导岩浆侵位,在早期花岗岩体和围岩内断裂中形成矿体和云英岩脉体,从而形成内带和外带含矿石英脉;成岩成矿后区域构造小规模错动、破坏岩脉与矿脉,但未改变岩脉矿脉的整体展布。
Taoxikeng tungsten deposit of Jiulongnao orefield in Nanling area is a typical quartz-vein-type wolframite deposit,and was formed both by the limits of faults and the granites in the south area of Jiangxi Province.In order to do structural analysis of the deposit,eight middle-tunnels mapping and near-ground or hole drillings were completed,by which the geometry and structural and constructional characteristics of orebearing quartz veins,vein group,ore body and ore-bearing granites were measured in detail,as well as collected statistical data of occurrences of ore veins and ore-related faults.The quartz-vein orebodies existed in long straight plates with pinch-out ends,and arranged in sinistral diagonal pattern,and the vein groups in different trend were crossed each other in diamond stockwork shapes.The ore-bearing granite is a step-like rectangular block emplaced by stoping and dyke spreading intruded from NE to NW.The deposit and orebearing granite is of multi-period in metallogeny and was formed by faults in a predominant factor.Thus the paper established a comprehensively structural and magmatic metallogenic model.That is,the conjugate fault grid system was induced by regional geological stress firstly;the granite upwelled and emplaced in diamonds cut by the faults and filled with greisen and ore-bearing quartz veins secondly;thirdly,reaction of regional tectonic events triggered breaks in wall rock and granite that induced another magma intrusion with ore and greisen veins,such as inner and outer belts of ore-bearing quartz veins.Although there were some slight displacements in the veins,the whole distribution was unchanged.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2016年第4期148-165,共18页
Earth Science Frontiers
基金
国土资源部公益性行业科研专项(201411050
201411035)
国家科技支撑计划项目(2011BAB04B07)
中央地质勘查基金项目(2013360010)
关键词
成矿构造解析
构造岩浆作用与成矿
淘锡坑石英脉型黑钨矿床
南岭九龙脑矿田
structural analysis of metallogeny
tectono-magma event and metallogeny
Taoxikeng wolframite
Jiulongnao orefield in Nanling area
