青海省五龙沟金矿构造控矿特征研究

发布时间：2018-04-26 08:44

  本文选题：五龙沟金矿 + 构造控矿　； 参考：《中国地质大学(北京)》2015年硕士论文

【摘要】：五龙沟金矿位于青海省西南部的东昆仑山地区,矿区内发育有NW-NWW向的韧性剪切带和脆性构造,控制了矿区岩浆岩的分布和金矿体的形成。本文以五龙沟金矿区的构造及其控制的矿体为对象开展研究工作,结合运用构造地质学、岩石学、同位素地质年代学等多门学科,采用电子背散射衍射(EBSD)、SHRIMP锆石U-Pb定年等测试方法,结合前人的研究成果对该区的构造控矿特征进行研究,得到以下几点结论:1、五龙沟金矿区矿化蚀变带均沿NW-NWW向构造线展布,说明其形成受到NW-NWW向韧性剪切和断裂构造的控制,因此,五龙沟地区的NW-NWW向韧性剪切带和断裂是该区的主要控矿构造。2、通过电子背散射衍射(EBSD)分析,得到石英组构图。结果显示五龙沟地区韧性剪切变形温度为350-450℃,其变形温度反映矿区成矿环境为中低温-中温,与前人们的观点基本一致,即五龙沟金矿床为一中低温的蚀变岩型矿床。3、五龙沟金矿在成矿时代上具多期性的特征,其中印支期为主要成矿期,其主成矿时代与该区的韧性剪切变形与脆性断裂构造活动的时代相吻合,金矿最早形成受控于晚加里东期韧性剪切构造变形活动,造成金矿的初步富集;印支期韧性剪切带和脆性断裂的活动使该区金矿沿断裂带处再次得到富集;晚印支-早燕山期,该区断裂构造再次发生变形活动并改造了先前形成的矿体。
[Abstract]:The Wulonggou gold deposit is located in the East Kunlun Mountains in the southwest of Qinghai Province. There are ductile shear zones and brittle structures in NW-NWW direction in the mining area, which control the distribution of magmatic rocks and the formation of gold bodies. In this paper, the structure of the Wulonggou gold deposit and its controlled orebodies are taken as the object of study, combined with the application of many disciplines, such as tectonic geology, petrology, isotope geochronology, etc. By means of electron backscatter diffraction (EBSD) diffraction and shrimp zircon U-Pb dating method, combined with previous research results, the authors studied the characteristics of tectonic ore-control in this area, and obtained the following conclusions: the mineralization alteration zones of the Wei 1 and Wulonggou gold deposits are distributed along the NW-NWW tectonic line. It shows that its formation is controlled by NW-NWW ductile shear and fracture structure. Therefore, the NW-NWW ductile shear zone and fault in Wulonggou area are the main ore-controlling structures in this area. The composition of quartz group is obtained by electron backscattering diffraction (EBSD) analysis. The results show that the ductile shear deformation temperature in Wulonggou area is 350-450 鈩，

本文编号：1805290