九瑞矿集区三维电性结构研究及找矿意义

发布时间：2018-04-30 05:24

本文选题：九瑞矿集区 + 音频大地电磁法　；参考：《东华理工大学》2015年硕士论文

【摘要】：江西九瑞地区位于长江中下游成矿带,是全国重点整装勘查区之一,也是我国重要的铜金铅锌矿集区。多年地质勘查和科学研究已经证明,长江成矿带资源远景广阔,找矿潜力巨大,其深部找矿工作一直是研究重点和热点,而研究该区域的地下电性结构特征,对长江中下游找矿具有重要意义。本文依托“十二五”国家科技支撑项目“江西九瑞矿集区控矿地层和岩体三维探测与找矿预测研究(编号2011BAB04B03)”课题,以九瑞地区的音频大地电磁测深面积性剖面数据为基础开展研究。论文在综合分析研究区地质资料并对典型地层和岩石标本进行电阻率参数测试的基础上,利用研究区面积性AMT数据开展地下三维电性结构研究。为获得AMT最佳反演参数,选择三条典型AMT剖面开展二维非线性共轭梯度(NLCG)反演试验研究,总结出利用TM极化模式数据、拉格朗日乘子等于3的二维反演方案。综合利用地质、钻探和电性特征对全区23条AMT剖面进行二维约束反演后,将所有剖面的反演电阻率三维网格化,得到了研究区的三维电性结构。最后,我们通过对三维电性结构的综合分析,确定研究区地下地层、岩体展布、断裂构造分布特征以及基底起伏情况。通过与已知矿床对比,结果表明浅部北西向断裂与北东向区域性深部断裂交汇处、基底隆起凹槽边缘以及岩浆通道附近为成矿有利区。
[Abstract]:Jiurui area in Jiangxi Province is located in the middle and lower reaches of the Yangtze River. It is one of the key integrated exploration areas in China, and is also an important copper, gold, lead and zinc deposit concentration area in China. Years of geological exploration and scientific research have proved that the metallogenic belt of the Yangtze River has a broad prospect of resources and great prospecting potential, and its deep prospecting work has always been the focus and hot spot of research, and the study of the characteristics of underground electrical structure in this area. It is of great significance for prospecting in the middle and lower reaches of the Yangtze River. This paper relies on the "12th Five-Year Plan" National Science and Technology support Project, "Three-dimensional exploration and prediction of ore-controlling strata and rock mass in Jiurui ore concentration area, Jiangxi Province (No. 2011BAB04B03)". Based on the area profile data of Audio magnetotelluric sounding in Jiurui area, the research is carried out. Based on the comprehensive analysis of geological data of the study area and the measurement of resistivity parameters of typical strata and rock specimens, the underground three-dimensional electrical structure is studied by using the area AMT data of the study area. In order to obtain the best inversion parameters of AMT, three typical AMT profiles are selected to carry out the experimental study of 2-D nonlinear conjugate gradient inversion, and a two-dimensional inversion scheme with Lagrange multiplier equal to 3 using TM polarization model data is summarized. Using geological, drilling and electrical characteristics, the inversion resistivity of 23 AMT sections in the whole area was meshed and the three-dimensional electrical structure of the study area was obtained after 2-D constrained inversion of all the sections. Finally, through the comprehensive analysis of the three-dimensional electrical structure, we determine the underground strata, the distribution of rock mass, the distribution characteristics of fault structures and the fluctuation of basement in the study area. By comparison with known deposits, the results show that the junction of shallow NW-trending faults with NE-trending regional deep faults, the margin of basement uplift trough and the vicinity of magmatic channels are favorable areas for mineralization.
【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】：P631.3

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