内蒙古东布拉格铅锌钼矿床地质特征及成岩、成矿时代研究

发布时间：2018-04-24 13:40

本文选题：矿床特征 + 成岩时代　；参考：《石家庄经济学院》2015年硕士论文

【摘要】：内蒙古东布拉格铅锌钼矿区位于兴蒙造山带北东-北北东走向的西乌旗早古生代俯冲带哈日根台复背斜西南端之东不拉格向斜两翼内,展布于大兴安岭拜仁达坝-道伦达坝-沙布楞山-花尔包特铜多金属成矿带中。该地区褶皱和断裂构造均很发育,成矿条件有利,是大兴安岭东南缘成矿集中区重要的组成部分。矿区内的花岗斑岩与A型花岗岩地球化学特征相似,具有高硅、富碱、弱过铝质的特点,表现出壳源型岩石地球化学特征;石英二长岩以富碱性为特征,与I型花岗岩地球化学特征相似,表现出壳-幔混源型岩石地球化学特征;流纹斑岩样品测试数据在Si O2-AR(碱度率)图解中落入碱性范围内,在K2O-Na2O图解中落入S型花岗岩范围,表现出壳源型岩石地球化学特征;肉红色花岗岩与A型花岗岩地球化学特征相似,具有高硅、富碱、过铝质的特点,表现出壳源型岩石地球化学特征。东布拉格矿区可能存在两期岩浆活动,第一期岩浆活动时间为164.2±2.7Ma~160.9±2.9Ma;第二期岩浆活动时间为158.5±2.9Ma~155.6±3.2 Ma。东布拉格矿区钼矿床的成矿很可能是多期次成矿,第一次成矿时代为162.2Ma~162.6Ma,第二次成矿时代为151.8±2.8 Ma,都是侏罗纪成矿,并且与可能存在两期岩浆活动相对应。
[Abstract]:The eastern Bragg lead-zinc-molybdenum ore area of Inner Mongolia is located in the two wings of the East Breag syncline at the southwest end of the Harigentai complex anticline in the West Wuqi early Paleozoic subduction zone with the north-northeast strike of the Xingmeng orogenic belt. It is distributed in the Bayrenda-Dalunda-Shablangshan-Huerbao copper polymetallic metallogenic belt in Daxing'anling Mountains. The fold and fault structures are well developed and the metallogenic conditions are favorable in this area, which is an important part of the metallogenic concentration area in the southeast margin of the Daxing'anling Mountains. The granitic porphyry in the mining area is similar to the A-type granite in geochemical characteristics, with the characteristics of high silicon, rich alkali and weak peraluminous, showing the geochemical characteristics of crust-source rocks, and quartz monzonite is characterized by alkalinity. Similar to the geochemical characteristics of I-type granite, it shows the petrogeochemical characteristics of crust-mantle mixed source, and the test data of fluid porphyry samples fall into the alkaline range in the diagram of Sio _ 2-AR (basicity ratio), and fall into the range of S-type granite in the K2O-Na2O diagram. The meat-red granite is similar to A-type granite and has the characteristics of high silicon, rich alkali and peraluminous, showing the geochemical characteristics of crust-type rocks. Two phases of magmatic activity may exist in East Prague mining area, the first stage magmatic activity time is 164.2 卤2.7Ma~160.9 卤2.9 Ma, the second stage magmatic activity time is 158.5 卤2.9Ma~155.6 卤3.2Ma. The mineralization of molybdenum deposit in East Prague ore area is probably multi-stage metallogenic, the first metallogenic age is 162.2 Ma-162.6 Maand the second metallogenic age is 151.8 卤2.8Ma. all of them are Jurassic metallogenic, and correspond to the existence of two periods of magmatic activity.
【学位授予单位】：石家庄经济学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.4;P618.65

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