基于江西灵山岩体成矿模式的重磁场特征研究

发布时间：2018-03-18 23:31

本文选题：磁法勘探　切入点：灵山岩体　出处：《东华理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：江西灵山岩体位于江西省上饶市境内,属于环状复式花岗岩体,出露在赣东北断裂的南东侧。岩体经历了四个重要地史阶段,侵入岩类众多,岩浆活动频繁,矿产资源丰富。本文以江西省矿产资源调查项目为依托,在灵山地区开展1:5万地面高精度磁测,分析研究了灵山地区成矿条件与磁异常的相关性,并对该区航磁异常进行查证。本文通过统计分析灵山地区采集的1300多块岩矿石标本磁化率,对灵山岩体及其他各类岩性的分布规律和磁性特征进行了研究。结果表明,该地区不同范围、不同时期花岗岩的磁化率特征有所不同。对岩矿石磁化率的研究,丰富了该区的物性资料,为磁异常的解释提供了可靠的依据。作者在大量收集和查阅灵山地区相关地质资料和前人研究成果的基础上,结合地面磁异常对灵山地区的地质条件、成矿特征和分布规律进行了相互验证,分析了控矿构造、成矿特征与磁异常形成的内在关系。在磁异常处理与转换中,分别采用了化极、解析延拓、导数计算等方法,较好地突出了有用的异常信息。作者还采用匹配滤波对磁异常进行区域场和局部场的分离,据此确定了磁性地质体的埋深,同时利用小波多尺度分解提取了不同深度磁异常信息,对比已知地质资料可知,所提取的磁异常信息较好地反映了磁性地质体的结构特征,表明磁异常存在的可信性。在磁异常反演解释中,选取了一条实测剖面,采用希尔波特变换反演和2.5D人机交互反演,在大量的模型计算的基础上,取得了较好的反演效果。最后,对灵山地区的磁异常特征和形成机制进行了研究,根据磁异常预测了灵山岩体外围的成矿远景。
[Abstract]:Jiangxi Lingshan pluton is located in the territory of Jiangxi city of Shangrao Province, which belongs to the annular composite granite body, exposed in the South East Northeast Jiangxi fracture. The rock experienced four important historical stages, intrusive rocks, frequent magmatic activities, rich in mineral resources. This paper based on the project of mineral resources in Jiangxi Province as the basis, to carry out 1:5 million high ground precision magnetic survey in the Lingshan area, analyzed the correlation of metallogenic conditions of Lingshan area and the magnetic anomalies, and the aeromagnetic anomaly verification. Through statistical analysis of Lingshan collected more than 1300 blocks of rock sample magnetic susceptibility of Lingshan rock and other types of lithologic distribution and magnetic properties were studied. The results showed that in this area, different scope, different periods of granite magnetic susceptibility characteristics are different. To study the magnetic susceptibility of rocks and ores, enrich the physical data of the area, for magnetic anomaly interpretation To provide a reliable basis. Based on the collection and access to a large number of geological data in Lingshan area and the results of previous studies, combined with the ground magnetic anomaly on the geological conditions of Lingshan area, the metallogenic characteristics and distribution rules of mutual verification, analysis of the ore control structure, internal relation and magnetic anomaly characteristics of ore formation. In the magnetic anomaly processing and conversion, the pole, the analytic continuation and derivative calculation methods, reflect the abnormal information useful. The author also used to separated region field and the local magnetic anomalies of matched filtering, to determine the depth of magnetic geologic body, and the use of multi-scale wavelet decomposition the different depth of the magnetic anomaly information extraction, comparison of the geological data shows that the extracted magnetic anomaly information can reflect the structural characteristics of magnetic geologic body, show that the magnetic anomaly existing in magnetic credibility. Anomaly inversion interpretation, selecting a survey section, using the Hill Porter transform inversion and 2.5D interactive inversion, based on a large number of calculation model, achieved good inversion effect. Finally, the magnetic anomaly characteristics in Lingshan area and the formation mechanism was studied according to the magnetic anomaly predicted metallogenic rock body in Lingshan periphery.

【学位授予单位】：东华理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P631

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