云南普朗斑岩型铜矿区矿化蚀变弱信息遥感提取方法及其应用研究

发布时间：2018-04-25 07:05

本文选题：ASTER + 矿化蚀变分带　；参考：《昆明理工大学》2015年硕士论文

【摘要】：在中国的西南三江的中段,义敦岛弧南端的云南普朗斑岩型铜矿区,是目前中国铜多金属重要的成矿带,区内普朗铜矿已达到超大型规模,松诺和地苏嘎铜多金属矿也已达到小型以上规模。随着普朗斑岩型铜矿找矿勘查的深入,该矿床成因与演化等地质研究工作也得到了不断深化。但普朗矿区海拔较高(3000-4800m),相对高差大,地质背景复杂,植被茂密,年积雪时间长,交通条件差,传统地质测量及测试分析工作受到制约,严重影响了该区的找矿勘查进展。矿化蚀变地质异常信息经常会呈现出微弱或低缓的信息,且这些异常信息常常会和背景的干扰信息相互混合与叠加在一起,以往用于矿化蚀变弱异常信息提取的遥感数据在前期处理中往往将植被、阴影、云、雪以及水体等全部作为干扰信息将其去除,这样许多较弱的蚀变异常信息也一起被去除,从而遥感蚀变异常信息完整与准确的提取受到了一定程度的影响；此外,以往的多数研究侧重于对羟基、铁染等类型蚀变信息的提取,针对斑岩型铜矿含矿斑岩体,硅化、钾化—绢英岩化—青磐岩化分带等找矿标志的诊断性波谱特征分析及其精细化提取则较少涉及。针对以往研究中存在的不足：对矿化蚀变信息的提取精细化程度较低、对推进西南三江地区斑岩型铜矿深部找矿勘查支撑作用有限,本论文针对普朗斑岩型铜矿区的矿化蚀变分带,对其矿化蚀变分带的特征矿物组成、诊断性波谱和该区ASTER遥感波谱响应进行分析与研究；采用多重分形“广义自相似性”和“局部奇异性”理论与含量面积法(C-A法),分析研究在复杂地质背景条件下斑岩型铜矿蚀变分带特征矿物的弱信息增强与提取方法,其主要弱信息包括：青磐岩化(绿泥石、绿帘石)、硅化绢云母化(石英、绢云母)、钾化(钾长石)硅化(石英)；最后经对蚀变分带的结果进行实地查证及岩矿鉴定,印证了本文所构建的对于斑岩型铜矿蚀变分带遥感异常增强与提取方法的可靠性。
[Abstract]:The Plang porphyry copper deposit at the southern end of Yidun Island Arc is an important copper polymetallic metallogenic belt in China at present, and the Plang copper deposit has reached a very large scale in the middle section of Sanjiang River in southwest China. Sonno and Disuga copper polymetallic ore have also reached a small scale above. With the exploration of porphyry copper deposits in Plang, the geological research on the genesis and evolution of the deposit has been deepened. But in Plang mining area, the relative height difference is large, the geological background is complex, the vegetation is dense, the annual snow cover is long, the traffic condition is poor, and the traditional geological survey and test and analysis work are restricted, which seriously affects the progress of prospecting and exploration in this area. The information of mineralized alteration geological anomalies often presents weak or low information, and these abnormal information are often mixed and superimposed with the interference information of the background. The remote sensing data, which were used to extract the weak anomaly information of mineralization and alteration in the past, tend to remove vegetation, shadow, cloud, snow and water as interference information in the previous processing, so that many weaker abnormal information of alteration are also removed. Therefore, the complete and accurate extraction of alteration anomaly information by remote sensing is affected to some extent. In addition, most previous studies have focused on extracting alteration information of the type of alteration such as hydroxyl group and iron stain, aiming at silicification of porphyry copper ore-bearing porphyry bodies. The diagnostic spectral characteristics analysis and fine extraction of the ore-prospecting markers such as potated-sericite and Qingiranlizhuan are less involved. In view of the shortcomings of previous studies, the extraction of mineralization alteration information is of low precision, which is of limited support to the Prospecting and exploration of porphyry copper deposits in Sanjiang area, southwest China. In this paper, the characteristic mineral composition, diagnostic spectrum and ASTER remote sensing spectral response of the mineralized alteration zone in Plang porphyry copper ore area are analyzed and studied. Based on the multifractal theory of "generalized self-similarity" and "local singularity" and the content area method of C-A method, the method of enhancing and extracting weak information of porphyry copper alteration zone characteristic minerals under complex geological background is analyzed and studied. The main weak information includes: Qingiranlitization (chlorite, verdanite, siliconized sericite (quartz, sericite), potassium (potassium feldspar) silicification (quartz); finally, the results of altered zonation are verified on the spot and the rock and ore are identified. It is confirmed that the method of remote sensing enhancement and extraction of alteration and variation zones of porphyry copper deposits is reliable.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.41;P627

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