物探方法在内蒙敖汉旗铁矿勘查中的应用研究

发布时间：2018-02-27 02:35

本文关键词： 磁法勘探电法勘探方法组合　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：针对研究区的含矿目标层的分布特点结合区域地质背景、矿区地质条件和物性参数,确定本区沉积变质型铁矿为高磁、低阻的地球物理特征,采用高精度磁测和音频大地电磁测深物探组合方法测量方式。矿区铁矿成矿类型为沉积变质型,赋矿地层属于太古界建平群小塔子沟组的一部分,其性质属于中深变质岩系。岩系特点为断裂构造以及褶皱构造两者。其中,褶皱构造的这个部分体现在王家营子复式向斜的南西段,这段地貌是由太古界建平群变迁出来的喀喇沁,方向为北东东向。利用磁法勘探与电法勘探相结合的物探方法,结合矿区地质条件和已知矿体特征,增加异常解译约束条件,进而充分了解磁异常源的基本性质,掌握这个异常源在地底下的规模、形态以及产状。地面的电磁勘测结果和高精磁扫面,可以良好地吻合已知的地质现象,这也说明,那些具有低阻异常和高磁异常的区域,极有可能是含矿地区。对磁铁矿等多金属矿的搜寻过程中,将多种物探方法进行相互配合,以谋求结果的合理性及有效性,最终结果让人感到欣慰,这种类型的勘探方法为同类型的矿区勘探提供了参考,意义重大。
[Abstract]:In view of the distribution characteristics of the ore-bearing target layers in the study area, combined with the regional geological background, the geological conditions and physical parameters of the mining area, it is determined that the sedimentary metamorphic iron ore in this area is characterized by high magnetic and low resistivity geophysical characteristics. High precision magnetogrammetry and audio frequency magnetotelluric sounding geophysical prospecting method are used. The ore-forming type of iron deposit is sedimentary metamorphic type and ore-bearing strata are part of Xiaotazigou formation of Jianping Group in Archean. It is characterized by fault structure and fold structure. Among them, this part of fold structure is embodied in the south west segment of Wangjiayingzi complex syncline. This section of geomorphology is the Karaerqin changed from Jianping Group of the Archaean, and its direction is north east and west. By using the geophysical exploration method combined with magnetic exploration and electrical exploration, combining with the geological conditions of the mining area and the characteristics of known orebodies, the anomalous interpretation and constraint conditions are added. Furthermore, we can fully understand the basic properties of the source of magnetic anomalies, and grasp the scale, shape and occurrence of the source below ground. The results of electromagnetic survey on the ground and the surface of high precision magnetic scanning can well coincide with the known geological phenomena, which also shows that, Those areas with low resistivity anomalies and high magnetic anomalies are likely to be ore-bearing areas. In the search for polymetallic ores such as magnetite, various geophysical prospecting methods are coordinated in order to obtain the rationality and validity of the results. The result is gratifying. This kind of exploration method provides a reference for the exploration of the same type of mining area and is of great significance.
【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】：2017
【分类号】：P631;P618.31

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