【作者】 李磊；

【导师】 王万银； 刘宽厚；

【作者基本信息】 长安大学 ， 地质工程（专业学位）， 2014， 硕士

【摘要】 宁夏中卫市香山地区是宁夏重要的金属矿产和非金属矿产分布区，但是由于其所处特殊的大地构造位置和复杂的地质背景，虽然一直以来开展了很多的地质与地球物理工作，但是经过几十年的工作，目前尚无大的突破，仍然处于找矿的初级阶段，需要探讨地下地质体和岩体的分布。本篇文章通过收集了宁夏中卫市香山某地区的大比例尺磁力资料，通过相关方法的处理，分析了地下岩体和地质体的分布，为进一步找矿提供指导。本文通过该地区的磁力异常资料为基础，依据研究区域当地的区域地质资料和岩石物性资料，通过磁异常形成原因分析，利用磁力解释方法处理技术中的垂向一阶导数技术、归一化总水平导数垂向导数技术和人机交互式正反演技术探索了研究区圈定岩浆岩体的一套理论方法。取得了一定的成果与结论：（1）通过对研究区的收集到的磁力异常资料，进行相关的处理，得到了一些研究区的磁异常基础图件，同时分析找到了磁异常产生的原因：磁异常是由研究区内的未发生围岩蚀变的辉绿岩岩体引起的，蚀变之后的辉绿岩磁性较弱，几乎不能引起磁异常。（2）作了垂向一阶导数处理和归一化总水平导数垂向导数处理之后，结合两种处理技术的结论，圈定了研究区域的辉绿岩岩体的平面分布范围，然后结合出露辉绿岩岩体，分析预测了辉绿岩发生围岩蚀变的区域，并根据蚀变区域对辉绿岩岩体的平面范围进行修正，最后得到了整个研究区的全部辉绿岩岩体的平面分布范围结果。（3）通过RGIS2010处理软件分别作了2.5维人机交互式反演和反演结果立体可视化，清楚地表征了研究区的辉绿岩岩体的空间分布形态：利用不同模型磁力2.5维人机交互反演方法的相互对比，表现了剖面上岩体的形态，通过反演结果可视化方法的结果和2.5维人机交互反演方法的对比，发现了反演结果立体可视化处理之后，图面更加清楚、细节更加清晰、内容更加丰富、结果与真实的地质体更加接近。（4）通过对辉绿岩岩体做空间规模形态分析，最终确定了该区域辉绿岩岩体的规模，大块的辉绿岩岩体规模比较大，位于研究区近中心位置的大面积磁异常之下，是一块大的辉绿岩岩盘，出露的辉绿岩是由岩盘上涌侵入到地层之中的，比较清楚准确地反映了地下辉绿岩岩体的形态，为以后的地质工作提供了基础，也同时证明了研究方法的适用性。更多还原

【Abstract】 Xiangshan area of Ningxia Zhongwei City is an important metal mineral and nonmetaldistribution area in Ningxia province, but because of the special tectonic location andcomplex geological background, although in this area it has been developed a lot of Geologyand Geophysics work, after decades of work, there is no big breakthrough, it still in theprimary stage of prospecting, distribution of subsurface geological body and rock mass. Thisarticle through the collection of large scale magnetic data in a certain Xiangshan area ofNingxia Zhongwei city, by processing the correlation method, analyses the distribution ofunderground rock and geological body, and provide guidance for further ore prospecting.In this paper, the magnetic anomaly data bases on the Ningxia Zhongwei Xiangshan HillArea, bases on the local regional geological and petrophysical data, uses the causes of theformation of the magnetic anomaly, uses first vertical derivative method,NVDR_THDRmethod and men-computer interactive inversion technology in the gravitational and magneticinterpretation methods have been explored a set of method to delineate the magmatic rock, atthe same time, applies of this method to the study area.. The paper has explore achieved someResults and conclusion:(1) Using the collected magnetic anomaly data from the study area, do some relatedtreatment work, acquirs the magnetic anomaly map of study area and some analysis,meanwhile, finds the cause of magnetic anomaly generated: magnetic anomaly is caused bythe diabase rock mass without the occurrence of wall rock alteration, When the alterationoccurres, magnetism becomes weak, it almost cannot cause magnetic anolomy.(2) When finished the work of the first vertical derivative processing and theNVDR_THDR processing, combining with two kinds of processing technology of conclusion,planed the distribution of diabase rock mass delineation of the study area, and then exposeddiabase rock mass, analysed and predicted of the wall rock alteration zone, and revise the rockmass plane according to the alteration zone of diabase, finally got the plane distribution rangeof diabase rock mass in the whole research area. (3) Using RGIS2010processing software finished the2.5D human-computerinteractive inversion works and3D visualization inversion works, Clearly represent thedistribution of diabase rock of the study area space: Using different magnetic models2.5Dhuman-computer interactive inversion, Through the comparison of different models,Performes of the section morphology of rock mass. Through the comparison of3Dvisualization inversion results with2.5D human-computer interactive inversion results, find itclearly that the3D human-computer interactive inversion’s drawing clearer, its detail sharper,its content richer, its result closer to the real geological body.(4) Using distribution analysis of diabase rock mass, ultimately point out thedistrbution ofthe region’s diabase rock bodies. Large scale diabase body is relatively large, large area islocated in the study area near the center position of the magnetic anomaly, a piece of diabaserock, diabase is exposed by rock upwelling into strata, more clearly reflect accurately theshape of diabase rock mass of underground, the result also proves that the methods isapplicable to the research, besides the paper gives out the wall rock alteration zone in the area,provide the base of the future geological work.更多还原