江西相山地区遥感蚀变信息提取及综合成矿预测

发布时间：2018-06-25 00:08

本文选题：遥感蚀变信息 + 证据权法　；参考：《东华理工大学》2015年硕士论文

【摘要】：相山地区位于赣杭火山岩成矿带南西段,断裂构造和岩浆岩发育,变质作用广泛,地层露头齐全。前人针对相山地区的成矿规律、大地构造背景、矿产类型等做了很多研究,发现相山地区具有需找大型铀矿床的潜力。本文在对研究区已有地质相关资料进行研究的基础上,选用了OLI遥感数据进行铀矿化蚀变信息异常提取并且通过目视方法进行了线环构造的解译。论文运用“证据权法”定量分析了地层、线性构造、地球化学异常、蚀变信息异常等致矿信息与矿床(点)空间分布关系;通过各成矿相关信息的权重值进一步选取最终的有利证据因子:U地球化学异常、有利地层单元(Qbss1、ηγπk1s)、线性构造(中心对称度)、铁染蚀变异常等作为构建成矿预测模型的地质变量;最终通过所得的后验概率值对相山铀矿床进行预测并划分不同级别的成矿远景区。圈定的铀成矿靶区共有4处,其中A类远景区有1处,B类远景区2处,C类远景区1处。成矿远景区主要受NNE和NNW的断裂构造控制;遥感蚀变异常和各异常权重值表明远景区内成矿主要与铁染异常相关;越高级别的矿产资源潜力区U化探异常值越高;圈定的远景区内也存在众多矿床(点),证明预测结果具有一定的可靠性,圈定出的成矿靶区具有进一步研究的工作价值。
[Abstract]:Xiangshan area is located in the south of the Gan-hang volcanic metallogenic belt. Fault structures and magmatic rocks are developed, metamorphism is extensive, strata outcrop is complete. Many researches have been done on the metallogenic law, tectonic background and mineral type of Xiangshan area. It is found that Xiangshan area has the potential to find large uranium deposits. On the basis of the research on the geological related data in the study area, Oli remote sensing data are selected to extract the uranium mineralization alteration information anomaly and to interpret the linear ring structure by visual method. The paper uses "evidence weight method" to quantitatively analyze the relationship between ore-causing information, such as strata, linear structures, geochemical anomalies, alteration information anomalies, and the spatial distribution of deposits (points). The final favorable evidence factor: U geochemical anomaly, favorable stratigraphic unit (Qbss1, 畏纬蟺 k1s), linear structure (centrosymmetric degree), iron-stained alteration anomaly and so on are further selected as geological variables of metallogenic prediction model. Finally, through the obtained posterior probability values, the Xiangshan uranium deposit is predicted and divided into different metallogenic areas. There are 4 uranium metallogenic targets in the delineated area, of which there are 1 type A scenic spot and 2 B type scenic spot and 1 C type scenic spot. The ore-forming area is mainly controlled by the fault structure of NNE and NNW, the value of remote sensing alteration anomaly and the weight value of each anomaly indicate that the ore forming anomaly is mainly related to iron stain anomaly, the higher the ore resource potential area is, the higher the U geochemical anomaly value is. There are also many deposits (points) in the delineated prospective area, which proves that the prediction results have certain reliability, and the delineated metallogenic target area has the work value of further study.
【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】：P627

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