地面高精度磁测在和龙地区铁矿调查中的应用

发布时间：2018-01-01 03:35

本文关键词：地面高精度磁测在和龙地区铁矿调查中的应用　出处：《吉林大学》2017年硕士论文　论文类型：学位论文

【摘要】：磁法勘探是利用仪器测量和分析岩石与矿体的磁异常,以查明地质构造和寻找有用矿产资源的一种有效地球物理方法。作为最早被使用的地球物理方法,磁法勘探在综合性地质调查、普查找矿、研究深部地质构造等方面都有广泛的应用,尤其是在寻找铁磁性矿产中有着突出的表现。本文是在以往工作基础上对已优选的和龙成矿远景区中的磁异常所圈定的成矿远景区进行重点找矿的前提下进行的,应用地面高精度磁法勘探来初步确定未知铁矿(化)体的走向及埋深,为进一步达到探求铁矿资源,圈定铁矿(化)体提供重要参考依据。为了对进一步了解工区地质构造和对未知矿体赋存状态进行解释推断,对磁测数据进行化极、延拓、求导以及解析信号等处理,结合地质、钻探等工程资料进行人机交互2.5D反演,对局部异常实现定性和定量分析,从而实现消除一些浅部小的磁性体的干扰,分离磁性体叠加异常,圈定矿化体的边界及范围,更有效和直观的体现磁异常和磁性体的对应关系。通过地面高精度磁测工作的开展,对研究区中的异常有了更深入的认识和了解:C-1测区主要为北东向与北西向两种构造,同时北西向构造被北东向构造所破坏,由此说明在C-1测区北东向构造要晚于北西向构造;在C-7和C-11异常区发现局部覆盖的玄武岩较破碎,无法形成高磁异常,并且推测其覆盖厚度不大,在C-9测区磁测结果表明高磁异常大都与磁铁矿有关或太古代变质岩内含有部分磁铁矿,在C-9测区南部通过剖面的反演得出深部有磁铁矿存在的推测,在C-11测区同样得出磁异常主要由太古代变粒岩形成的推测,部分变粒岩含有少量的磁铁矿从而形成测区的高磁异常。本文综合Mapgis、Surfer与Geosoft等物探专业软件,利用其各自对数据处理算法的优势与图形处理的优势,相互补充,使其系统的结合起来,令最终成果图元素更丰富、准确、协调。通过Microsoft Visual Basic编译器,编译实用小程序,实现对GSM-19T质子磁力仪数据的各项改正集中处理。
[Abstract]:Magnetic exploration is a measuring instrument and analysis of rock and ore body by using a magnetic anomaly, with effective geophysical method to identify the geological structure and find useful mineral resources. As the earliest use of geophysical methods, magnetic prospecting in the comprehensive geological survey, census prospecting, research on deep geological structure and other aspects are a wide range of applications, especially in the search for outstanding performance. This paper is ferromagnetic minerals are prerequisite for key prospecting eerspective region on the basis of previous work on the choice and mineralization of magnetic anomalies delineated by the application of ground high precision magnetic survey to determine the initial unknown iron ore (mineralized) body trend and depth, to further explore the delineation of iron ore resources, iron ore (mineralized) body. In order to provide an important reference for further understanding the geological structure and the ore body occurrence of the unknown State interpretation, are extremely, on magnetic data continuation, derivation and analytical signal processing, combined with geological and drilling data, interactive 2.5D inversion, realize the qualitative and quantitative analysis of local anomalies, so as to achieve the elimination of some shallow magnetic body small interference, separation of magnetic anomaly, boundary the scope and delineation of ore bodies, the corresponding relation is more effective and intuitive reflect the magnetic anomaly and magnetic body. Through the ground high precision magnetic survey work carried out in the study area of anomalies have a deeper knowledge and understanding of the C-1 test area is mainly the North East and North West and north two structure. West to the North East tectonic structures are destroyed, the test area ne structure later than NW structure in C-1; local coverage is broken in the C-7 and C-11 basalts anomaly area, can not form a high magnetic anomaly, and that the cover The cover thickness was not in the results of C-9 survey area shows that the high magnetic magnetic anomaly mostly with magnetite related or Archean metamorphic rocks containing magnetite and C-9 in the southern part of the surveyed area through the profile inversion of magnetite in the presence of that deep in the C-11 area also got magnetic anomaly is mainly composed of the Archean granulite formation is inferred in part, metadolerite contains a small amount of magnetite to form a high magnetic anomaly area. In this paper Mapgis, Surfer and Geosoft and other geophysical professional software, using their respective advantages of data processing algorithms and graphics processing advantages, complement each other, so that the combination of the system, so that the final results of map elements are more abundant, accurate, coordinated by Microsoft Visual Basic compiler, compile practical small procedures, to achieve the GSM-19T proton magnetometer data correction for centralized treatment.

【学位授予单位】：吉林大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P631.2;P618.31

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