内蒙古巴彦敖包土壤地球化学特征及成矿潜力初步预测

发布时间：2018-02-20 18:14

本文关键词： 土壤地球化学异常特征成矿预测巴彦敖包内蒙古　出处：《石家庄经济学院》2015年硕士论文　论文类型：学位论文

【摘要】：内蒙古巴彦敖包处于古亚洲洋构造域的二连-东乌旗成矿带,是中国北方和蒙古国最重要的多金属矿产地,成矿地质背景较好。区内构造主要以北西向断层为主,节理发育次之,褶皱不十分明显。研究区内侵入岩主要岩性为细粒黑云母二长花岗岩、中细粒似斑状黑云母二长花岗岩、中细粒花岗闪长岩和花岗斑岩。地层主要为上泥盆统安格尔音乌拉组砂质板岩及下白垩统大磨拐河组砂砾岩,其中上泥盆统安格尔音乌拉组砂质板岩与中侏罗世侵入岩接触带矿化蚀变发育,主要为硅化、褐铁矿化、云英岩化、角岩化等。本论文对土壤地球化学测量的工作方法进行了概述,分析了研究区内元素分布情况。元素异常下限由迭代法计算得出,利用地质软件(Mapgis6.7、sufer8.0)绘制了地球化学异常图,圈定了多个异常区。在1:5万土壤地球化学测量的基础之上,结合区域地质特征及本次地质调查工作,得出以下认识与结果:1)矿产的形成与构造关系密切,断层是区内岩浆活动的通道,是重要的导矿控矿构造。内生矿产以热液型矿产为主,其形成所需矿液流通的通道及矿石赋存的空间均与构造关系密切,矿脉或矿体均赋存在北东向断裂的次一级北西向张性裂隙中。2)利用多元统计方法进行了相关分析、聚类分析及因子分析,区内厘定3个找矿指示元素组合:(1)Ag-Pb-Cd-Zn-Hg-Sn;(2)Cu-Ni-Y-Li-Nb;(3)As-Bi-Mo-W。经组合异常评价,圈定了3个乙3类组合异常。3)矿化主要集中在区内西南部,根据化探异常及地质特征对研究区进行成矿预测,圈定位于研究区西南部的一处靶区,该靶区异常可能与热液活动有关。
[Abstract]:Bayan Aobo, Inner Mongolia, is located in the Erlian-Donwuqi metallogenic belt of the Paleo-Asian oceanic tectonic domain. It is the most important polymetallic mineral area in northern China and Mongolia with a good metallogenic geological background. The main lithology of the intrusive rocks in the study area is fine biotite monzogranite and medium fine porphyritic biotite monzomorphic granite. The middle and fine granodiorite and granitic porphyry are mainly composed of slate of upper Devonian Angaryinwula formation and conglomerate of Lower Cretaceous Damoguahe formation. In the contact zone of the Upper Devonian Angaryinwula formation between the slate and the Middle Jurassic intrusive rocks, the mineralized alteration is mainly silicification, limonite mineralization, and quartz petrolization. In this paper, the working methods of soil geochemical survey are summarized, and the distribution of elements in the study area is analyzed. The lower limit of element anomaly is calculated by iterative method, and the geochemical anomaly map is drawn by using the geological software Mapgis 6.7sufer 8.0). Several anomalous areas have been delineated. On the basis of 1: 50 000 soil geochemical survey, combined with regional geological characteristics and this geological survey, it is concluded that the following understanding is closely related to the formation and structure of mineral resources. Fault is the passage of magmatic activity in this area and is an important ore-conducting and ore-controlling structure. The correlation analysis, cluster analysis and factor analysis were carried out by using multivariate statistical method. Three ore-prospecting indicator element assemblages were determined in this area. The results show that the ore-prospecting indicator elements are composed of Cu-Ni-Ni-Y-Li-Nb3As-Bi-Mo-W, and three ore-prospecting indicator element assemblages are determined in this area, I. e., Cd-Pb-Cd-Zn-Hg-SnOU 2Cu Ni-Y-Li-Nb3As-Bi-Mo-W.by means of multivariate statistical analysis, cluster analysis and factor analysis, the ore veins or orebodies are located in the subprimary NW trending fractures. Three types of assemblage anomalies. 3) mineralization are mainly located in the southwest of the area. According to geochemical anomalies and geological characteristics, the metallogenic prediction of the study area is carried out, and the circle is located in a target area in the southwest of the study area. The anomaly of the target area may be related to hydrothermal 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】：P612;P632.1

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