遥感线性构造分形统计和蚀变信息提取在桂东地区金铅锌锡多金属成矿预测中的应用  

Application of Fractal Statistics of Linear Structure and Alteration Information Extraction of Remote Sensing on the Au,Pb,Zn,Sn Polymetallic Minerogenetic Prognosis in Eastern Guangxi

作　　者：赵少杰[1] 钱建平[1] 陈宏毅[1] 

机构地区：[1]桂林理工大学地球科学学院,广西桂林541004

出　　处：《大地构造与成矿学》2011年第3期364-371,共8页Geotectonica et Metallogenia

基　　金：有色及贵金属隐伏矿床勘查教育部工程研究中心和广西地质工程中心重点实验室基金;中国科学院地球化学研究所矿床地球化学国家重点实验室开放基金(200913)资助

摘　　要：在桂东地区ETM+遥感影像742波段融合的基础上,进行了线性构造和环形构造解译,运用分形几何学的原理和方法对研究区的遥感线性构造进行定量分析,利用计盒维数法求得研究区的线性构造分维值,得出该区线性构造具有良好的统计自相似性和分形特征,利用Surfer软件求得线性构造分维等值线图,采用主成分分析和比值法组合提取遥感蚀变异常信息。结果表明,本区环形构造、线性构造集中区、铁染羟基异常和地球化学异常区在空间上基本重合,且呈NE、NW向点阵式分布。线性构造分维值(D)介于1.4到1.85的强构造活动带为成矿优势区域。综合分析线性构造分维等值线、遥感蚀变信息异常、区域地质和地球化学等信息、已知矿床(点)信息,确定了三级成矿远景区。其中Ⅰ级远景区3个,Ⅱ级远景区2个,Ⅲ级远景区3个。Based on the fusion of band 742 of ETM＋ remote sensing image in Eastern Guangxi,the linear and circular structures were interpreted.The linear structures were analyzed quantitatively using the principle and method of fractal geometry.The fractal dimension values of linear structure were calculated by the box-counting dimension,and the linear structures showed good statistical self-similarity and fractal characteristics in this area.The contour map of the fractal dimension values was done by Surfer software.The anomaly of alteration information of remote sensing was extracted by the main component analysis and ratio method.These results show that the circular structure and linear structure concentration areas are basically coincide with iron and hydroxyl alteration and geochemical anomalies spatially,and have the characteristic of lattice distribution in NE and NW.The strong structural deformation belt with fractal dimension values（1.4～1.85） of linear structure is favorable metallogenic region.Based on comprehensive analysis for the fractal dimension values,anomalies of alteration information,regional geological and geochemical information,and the known ore occurrences（deposits）,three orders of metallogenetic prospective areas are proposed,which include three first,two secondary,and three tertiary order metallogenic prospect areas.

关 键 词：遥感影像 线性构造 环形构造 分维 蚀变信息提取 成矿预测 

分 类 号：P627[天文地球—地质矿产勘探] P612[天文地球—地质学]