柴北缘都兰地区Pb-Zn矿化信息提取与评价  

Pb-Zn Mineralization Information Extraction and Evaluation in Doulan Area,Qaidam

作　　者：王会敏[1] 陈守余[1,2] 赵江南[1,2] 董凯[1] Wang Huimin Chen Shouyu Zhao Jiangnan Dong Kai(Faculty of Earth Resources State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China)

机构地区：[1]中国地质大学(武汉)资源学院,武汉430074 [2]中国地质大学(武汉)地质过程与矿产资源国家重点实验室,武汉430074

出　　处：《地质科技情报》2016年第5期131-138,共8页Geological Science and Technology Information

基　　金：国家自然科学基金项目(41302264)

摘　　要：青海都兰地区是我国重要的铅锌矿集区之一。对该区域化探数据使用多重分形滤波(S-A)和衬值累加法提取了与铅锌矿化有关的异常信息并进行了评价,以进一步指导该地区找矿工作,首先使用主成分分析法确定与铅锌矿化有关的元素组合,然后使用多重分形反距离加权插值方法(MIDW)获取了Pb,Zn,Ag,Cd的栅格图像,最后运用S-A法和衬值累加法对组合元素矿化信息进行了提取。结果表明:1主成分分析确定与铅锌矿化相关的组合元素为:Pb-Zn-Ag-Cd。MIDW得到的栅格图像表明异常分布具有相似性,结合区域地质概况得到Pb、Zn矿化类型为热液交代(充填)型和接触交代型。2S-A法能够提取不同层次的致矿异常信息,包括区域异常信息和局部异常信息,揭示的局部铅锌异常突出了某些低背景中受断层控制的弱异常,衬值累加法进一步突出了Pb、Zn矿化相关的致矿异常,削弱了背景异常,但其异常面积相对较大,不利于靶区的优选。3综合对比2种方法得出热液交代(充填)型铅锌矿床受断层发育的滩间山群地层控制,在研究区中部断层较发育的高异常区有进一步寻找热液交代(充填)型铅锌矿床的潜力;接触交代型铅锌矿化受碳酸盐岩地层和岩体接触带构造控制,在研究区南部高异常区中的接触带构造中有进一步寻找这类矿床的潜力。The Dulan area in Qinghai Province is an important Pb-Zn mine set area.We extracted geochemical anomaly associated with Pb-Zn mineralization by principal component analysis,multi-fractal filtering（SA）and contrast accumulation in this paper.Firstly,the principal component analysis is used to identify geochemical element association associated with Pb-Zn mineralization.Then,the raster maps of Pb,Zn,Ag and Cd are obtained by multi-fractal inverse distance weighted（MIDW）.Finally,we extracted geochemical anomaly associated with Pb-Zn mineralization by S-A and contrast accumulation.The study reached the following results.1The principal component analysis is used to identify geochemical element association associated with Pb-Zn mineralization：Pb-Zn-Ag-Cd.These raster maps of Pb,Zn,Ag and Cd obtained by MIDW have similarity and indicate that there have hydrothermal metasomatic（filling）type and contact metasoinatic type according to mineralized types associated with Pb-Zn combined with regional geological background.2S-A method can extract different levels of mineral anomaly information,including regional and local anomalies.Local anomalies highlight some weak anomaly in low background controlled by faults.Contrast accumulation can further highlight Pb and Zn mineralization related mineral anomaly and weak background abnormalities,but the abnormal area is relatively larger,which is not conducive for locating Pb-Zn deposits.3By general comparison methods,we can know that the distribution of Pb-Zn deposits of hydrothermal metasomatic（filling）type is mainly controlled by Tanjianshan Group.In the middle of the study area where faults are developed there is the potential for this type of ore deposits.The distribution of Pb-Zn deposits of contact metasoinatic type is mainly controlled by contact zone between carbonate formations and rock mass.In the north of the study area where contact zone is developed,structures have the potential for such deposits.

关 键 词：主成分分析 多重分形滤波 衬值 矿化信息 都兰地区 

分 类 号：P624.6[天文地球—地质矿产勘探]