本文選題：五龍溝金礦 + 構(gòu)造控礦��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：五龍溝金礦位于青海省西南部的東昆侖山地區(qū),礦區(qū)內(nèi)發(fā)育有NW-NWW向的韌性剪切帶和脆性構(gòu)造,控制了礦區(qū)巖漿巖的分布和金礦體的形成。本文以五龍溝金礦區(qū)的構(gòu)造及其控制的礦體為對象開展研究工作,結(jié)合運(yùn)用構(gòu)造地質(zhì)學(xué)、巖石學(xué)、同位素地質(zhì)年代學(xué)等多門學(xué)科,采用電子背散射衍射(EBSD)、SHRIMP鋯石U-Pb定年等測試方法,結(jié)合前人的研究成果對該區(qū)的構(gòu)造控礦特征進(jìn)行研究,得到以下幾點結(jié)論:1、五龍溝金礦區(qū)礦化蝕變帶均沿NW-NWW向構(gòu)造線展布,說明其形成受到NW-NWW向韌性剪切和斷裂構(gòu)造的控制,因此,五龍溝地區(qū)的NW-NWW向韌性剪切帶和斷裂是該區(qū)的主要控礦構(gòu)造。2、通過電子背散射衍射(EBSD)分析,得到石英組構(gòu)圖。結(jié)果顯示五龍溝地區(qū)韌性剪切變形溫度為350-450℃,其變形溫度反映礦區(qū)成礦環(huán)境為中低溫-中溫,與前人們的觀點基本一致,即五龍溝金礦床為一中低溫的蝕變巖型礦床。3、五龍溝金礦在成礦時代上具多期性的特征,其中印支期為主要成礦期,其主成礦時代與該區(qū)的韌性剪切變形與脆性斷裂構(gòu)造活動的時代相吻合,金礦最早形成受控于晚加里東期韌性剪切構(gòu)造變形活動,造成金礦的初步富集;印支期韌性剪切帶和脆性斷裂的活動使該區(qū)金礦沿斷裂帶處再次得到富集;晚印支-早燕山期,該區(qū)斷裂構(gòu)造再次發(fā)生變形活動并改造了先前形成的礦體。
[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，

本文編號：1805290