内蒙古浩尧尔呼洞金矿床构造控矿解析

发布时间：2018-03-14 17:15

本文选题：内蒙古　切入点：浩尧而忽洞　出处：《中国地质大学(北京)》2015年硕士论文　论文类型：学位论文

【摘要】：浩尧尔忽洞超大型金矿床产出于华北地台北缘,赋存于黑色岩系含矿建造之中,该矿床品位低、储量大、易开采,为该区典型金矿床之一。矿体产于白云鄂博群比鲁特组第一、第二岩性段的炭质板岩、炭质千枚岩之中,严格受地层及构造控制,总体呈层状、似层状产出。本文着重对矿床的构造控矿特征进行工作,对矿区的褶皱、断裂以及构造活动产生的节理、显微构造等进行了细致的工作,从而分析构造活动对矿床形成的影响,探究构造成矿演化模式。矿区构造活动强烈,岩石变质强烈,破碎、节理等构造发育明显。矿区内节理大量的统计分析表明,矿区内节理倾向优选方位主要集中于50~70°、240~260°范围内,其次为NNE-SSW方位;通过对矿区内部共轭剪节理的分析,估算矿区所受应力情况,得出矿体的所受到的主应力σ1方向集中于NE-SW,应力方向较为集中。矿区显微构造特征表明,矿区经历了由韧性变形到脆性变形的转变。通过石英SR型动态重结晶与方解石双晶纹类型,得出矿床经历了一个由较高温度向低温转变的过程;通过石英重结晶颗粒法估算,石英动态重结晶时古差应力值在25.64MPa~55.38MPa之间,表现为较低的应力值范围。综上可知由于矿区温压条件的改变,浩尧而忽洞向斜岩层由韧性变形转变为脆性变形,在韧-脆性过渡域作用下,出现大量的节理、破碎带等利于成矿热液流体运移的通道,而后,晚古生代海西期大规模的岩浆侵入活动带来了大量的岩浆热液,从而导致了金的富集。
[Abstract]:The super large gold deposit of Haoyaoerhuodong occurred in the Taibei margin of North China and occurred in the ore-bearing formation of the black rock series. The deposit is of low grade, large reserves and easy to be mined, which is one of the typical gold deposits in this area. The carbonaceous slate and carbonaceous phyllite of the second lithologic member are strictly controlled by stratigraphy and structure, and are generally stratiform and bedded. This paper focuses on the structural ore-controlling characteristics of the deposit and the fold of the ore area. In order to analyze the influence of tectonic activity on the formation of ore deposits and to explore the tectonic metallogenic evolution model, the tectonic activity of the mining area is strong, the rock metamorphism is strong and the rock is broken. A large number of statistical analysis of the joints in the mining area show that the preferred orientation of the joints in the mining area is mainly concentrated in the range of 5070 掳/ 240 ~ 260 掳, followed by the NNE-SSW azimuth, and the conjugate shear joints in the mining area are analyzed. By estimating the stress in the mining area, it is concluded that the principal stress 蟽 _ 1 of the orebody is concentrated in NE-SWand the stress direction is relatively concentrated. Through the dynamic recrystallization of quartz SR type and the double grain type of calcite, the ore deposit has undergone a process of transition from higher temperature to lower temperature, and the quartz recrystallization particle method is used to estimate, During the dynamic recrystallization of quartz, the paleo-differential stress is between 25.64 MPA and 55.38 MPA, which shows a lower stress range. In summary, it is found that due to the change of temperature and pressure conditions in the mining area, the paleo-differential stress in the syncline of Haoyaodong has changed from ductile deformation to brittle deformation. Under the action of ductile and brittle transition zone, a large number of joints and broken zones were found to facilitate the migration of ore-forming hydrothermal fluids, and the massive magmatic intrusions during the late Paleozoic Hercynian period resulted in a large amount of magmatic hydrothermal fluids. This leads to the enrichment of gold.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.51

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