AMT及磁法在拉拉铜矿外围航磁异常查证中的应用研究

发布时间：2018-06-27 19:52

本文选题：拉拉铜矿 + 航磁查证　；参考：《成都理工大学》2017年硕士论文

【摘要】：拉拉铜矿外围及M163-1航磁异常查证区位于我国四川会理拉拉矿集区外围南部区域,处于我国著名的康滇地轴铜多金属成矿带上。同时,查证区位于本区重磁资料所示的高磁、高重力异常范围之内。通过观察和分析该区内航磁异常的规模、强度及构造情况,我们判断该区异常可能为有意义的找矿异常。因此,在该查证区内开展相关的地球物理查证工作具有十分重要的意义。本文在研究区成矿背景的基础上,选择地面高精度磁法及音频大地电磁测深两种方法开展相关的航磁查证工作。旨在运用地面高精度磁法来精准圈定研究区内磁性隐伏岩矿矿体的空间位置;运用音频大地电磁法来勘探查明研究区地下2km以内的深部电性结构特征情况。最后,依据已有的数据资料进行综合分析,解释并推测拉拉外围M163-1研究区内磁异常体形态、埋藏深度和电性特征。通过研究工作,摸清了查证区内主要控矿地层为河口群的天生坝组和落凼组,其中天生坝组呈高磁、高电阻特性,而落党组呈高磁低电阻特性;发现查证区内磁异常具有三级叠加特点,可以详细划分为两个浅部次级异常和一个深部主要异常;该查证区内地下构造整体表现为一大的向斜构造,且层状性良好,由浅到深依次呈现低-高-低-高的基本电性特征;综合地质-地球物理资料,解释并推测了拉拉外围M163-1研究区内磁异常体的形态、埋藏深度、电性特征并推断该区落凼组地层内物质可能是导致主异常的原因,即异常区内的落凼组地层为主要富矿层。
[Abstract]:The periphery of Lala Copper Mine and the M163-1 aeromagnetic anomaly checking area are located in the southern region of the periphery of the Lala Ore concentration area in Huili Sichuan Province and are located in the famous Kangdian axis copper polymetallic metallogenic belt in China. At the same time, the verification area is within the range of high magnetic and high gravity anomalies shown by gravity and magnetic data in this area. By observing and analyzing the scale, intensity and structure of aeromagnetic anomaly in this area, we can judge that the anomaly may be a significant ore prospecting anomaly. Therefore, it is of great significance to carry out geophysical verification in the verification area. In this paper, based on the metallogenic background of the study area, two methods, ground high precision magnetic method and audio frequency magnetotelluric sounding, are selected to carry out the related aeromagnetic verification work. The purpose of this paper is to precisely delineate the spatial position of the magnetic concealed rock ore bodies in the study area by using the surface high precision magnetic method, and to use the audio frequency magnetotelluric method to explore and find out the characteristics of the deep electrical structure within the underground 2km in the study area. Finally, based on the existing data, we explain and speculate the shape, burial depth and electrical characteristics of the magnetic anomaly in the M163-1 study area around Lala. Through the research work, we find out that the main ore-controlling strata in this area are the natural dam group and the Luodang formation, which are characterized by high magnetic field and high resistance, while those of the Luodang group are high magnetic and low resistance. It is found that the magnetic anomaly in the verified area has the characteristics of tertiary superposition, which can be divided into two shallow secondary anomalies and one main anomaly in depth in detail, and the underground structure in this area is characterized by a large syncline structure with good stratification. From shallow to deep, the basic electrical characteristics of low to high and low to high are presented, and the morphology and burial depth of magnetic anomaly in the study area M163-1 around Lala are explained and inferred by synthesizing geological and geophysical data. It is inferred that the material in the formation of Luodang formation may be the cause of the main anomaly, that is, the strata of the Luodang formation in the abnormal area are the main ore-rich strata.
【学位授予单位】：成都理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631

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