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The Primary Studing Halo Characteristics and Au Ore-controlling Structure of Xifengshan Ore Field in Xinjiang

Author: ZhangXiaoLong
Tutor: YangXingKe
School: Chang'an University
Course: Structural Geology
Keywords: ductile shear zone gold ore field of Xifengshan ore-controlling structure characteristics of the original halo
CLC: P618.51
Type: Master's thesis
Year: 2011
Downloads: 123
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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.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Precious metals > Gold
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