【作者】 张晓龙；

【导师】 杨兴科；

【作者基本信息】 长安大学 ， 构造地质学， 2011， 硕士

【摘要】 西凤山金矿田位于塔里木板块北部,处在秋格明塔什-黄山韧性剪切带南侧边缘,赋存于阿奇山-雅满苏岛弧环境的北侧,在康古尔塔格金矿带上,区域成矿地质条件优越,该金矿带有Au、Ag、As、Sb、Hg等元素的地球化学高背景区。该矿田赋存于下石炭统地层中,赋矿围岩主要为安山岩、安山质凝灰岩和华力西期花岗岩。区域上,该区带金的成矿作用主要受控于二叠纪后碰撞阶段秋格明塔什-黄山大型韧性剪切带形成的右行走滑剪切系统,在这一区带上,所有类型的金矿资源是在同一构造环境下相同区域成矿时间的产物,在不同构造部位产出的金矿床类型可以组成一个连续的金矿化系列。区域一级剪切构造带控制金矿带成矿物质和成矿流体的主要来源,二级剪切构造控制金矿床的发育,三级剪切裂隙系统控制金矿脉的产出,从而构成三级构造控矿系统。西凤山金矿田属于与中浅成花岗岩类侵入体有关的石英脉型金矿床。矿液来源为上地幔和下地壳。成矿流体主要为岩浆水。西凤山金矿田主要受华力西期花岗岩侵入体的断裂裂隙控制。矿田内85%以上的含金石英脉充填于花岗岩体内及其边部裂隙中。华力西期构造-岩浆-热液活动是该矿田内的主要成矿作用。通过对矿田内4个矿区的节理裂隙的统计得出其走向优势方位分别为：Ⅰ矿区285°,Ⅱ矿区270°,Ⅲ矿区310°,Ⅳ矿区32°。综合统计分析得出矿田内的节理裂隙走向优势方位NW向270°～310°。通过对西凤山矿田典型矿脉Ⅲ矿区q6矿脉地表、1036m中段、钻孔的岩石地球化学采样,通过原生晕特征分析对比,从地表到深部原生晕强度依次减弱。确定了西凤山金矿田的地表原生晕纵向分带(轴向分带)Bi-Sb-Hg-Mo-Ag-As-Cu-Au-Zn,得出该脉体的地表剥蚀程度可能已达到中下部。横向分带处于前三位的为Au、Bi、Cu,处于末位的是Pb、Zn, As元素原生晕略具向北偏的趋势,反映了矿体向北陡倾斜的特点。为研究区内寻找和勘查隐伏矿体提供了可靠的地球化学依据。应用控矿构造与原生晕地球化学结合的方法对该矿田进行评价,为该矿田找矿工作提供指导意义。更多还原

【Abstract】 Xifengshan gold field is situated in Tarimu plate, is develeped the south margin of the regional large-csale Qiugemingtashen-Huangshan ductile shear zone, and is located the volacanic island of Aqishan-Yamansu and Kangguertage gold belt. The condition of geological mineralization in the area is outstanding.The area also shows high geochemical background of Au,Ag,As,Sb,and Hg elements.The gold ore-field deposits in earlier Carboniferous strata.The wall rock of the mine are andesite,quartz andesite and granate. Gold mineralization is mainly controlled by the dextral strike-slip shear system developed along the Qiugemingtashen-Huangshan ductile shear zone during the Permian postcollisional stage in the region.All of the gold resources are the products of the same regional matallogenic event in the same tectonic setting, and all of gold types developed on different tectonic section of the shear zone can comprise a gold deposit continuum in this region.The regional first-order shear belt constrains the main sources of ore-forming material and ore-forming fluid,the second-order shear belt constrains the development of different gold type,and the third-order shear fracture system constrains the occurrence of gold orebody,constituting a three-level ore-controlling tectionic system.Xi Fengshan gold in the shallow part and granitoid intrusions into the quartz vein-type gold deposits.Ore fluid source for the upper mantle and lower crust.Ore-forming fluids is mainly magmatic water. Variscan tectonic-magmatic-hydrothermal activity is a mine field to the main mineralization. Through the mine fields of the four mines of the joints to the statistical advantage of its position were obtained for the:Ⅰmine 285°,Ⅱmine 270°,Ⅲmine 310°,Ⅳmine 32°. Comprehensive statistical analysis of the ore field advantage jointed is NW 270°～310°.Through the Xi Fengshan ore veinsⅢtypical surface mining q6 veins,1036m middle, drilling geochemical sampling, by analyzing and comparing features of the original halo, deep from the surface to the primary halo intensities weakened. Xi Fengshan identified gold surface with the primary halo longitudinal (axial banding) Bi-Sb-Hg-Mo-Ag-As-Cu-Au-Zn, come to the surface erosion of the veins may have been reached in the lower level. Horizontal banding in the top three are Au, Bi, Cu, at the bottom are Pb, Zn, As elements of the original halo slightly with the north side of the trend, is reflecting the steep north slope of the ore body characteristics. Search and exploration for the study of hidden ore body area to provide a reliable basis of geochemistry.Ore-controlling structure and application of primary halo geochemical method of combining the evaluation of the mine fields, mine fields to guide the work of prospecting.更多还原