华南地质2024，Vol.40Issue(2)：380-392,13.DOI:10.3969/j.issn.2097-0013.2024.02.013
基于分形理论的蚀变异常遥感解译——以广东阳山县为例
Remote Sensing Interpretation of Altera-tion Anomaly Based on Fractal Theory:A Case Study of Yangshan County,Guangdong Prov-ince
摘要
Abstract
The abnormal information of wall rock alteration is an important prospecting indicator for hydro-thermal deposits.The interpretation of wall rock alteration information by remote sensing technology is an important method to extract alteration information.This article used principal component analysis to extract iron contamination and mud alteration information from Landsat-5 TM remote sensing images in the Yang-shan area of Guangdong Province.The abnormal principal components extracted from the images were divid-ed into"pixel-area"and the number of pixels was counted.Then,the abnormal threshold was divided into fractal nonlinear divisions to achieve a more accurate classification method.The threshold method is based on the mutation point selection threshold for grading.The results of extracting alteration anomalies often con-tain a large amount of background information,impact of which was reduced by using the fractal theory to de-termine the critical value for grading.This study compared threshold method with fractal method used in the alteration anomalies in the study area.Finally,based on the fractal characteristics of the alteration anomaly information,the summation method was used to classify the iron staining and mud alteration anomaly infor-mation in the study area.The results show that compared with the threshold method,the fractal method en-hances the accuracy of threshold selection in the extraction of remote sensing alteration information.It is found that the mud alteration and iron staining alteration in the study area are mainly distributed in the north-eastern and northern regions,and are scattered in a small area in other regions,which provides better techni-cal support and data support for mineral exploration.关键词
蚀变异常/遥感解译/分形理论/主成分分析法/门限法/广东阳山县Key words
alteration anomaly/remote sensing interpretation/fractal theory/principal component analysis/threshold method/Yangshan county,Guangdong Province分类
地质学引用本文复制引用
祝一丹,吴志春,马粉玲,李华亮,秦耀祖..基于分形理论的蚀变异常遥感解译——以广东阳山县为例[J].华南地质,2024,40(2):380-392,13.基金项目
国家自然科学基金项目(41802247) （41802247）
江西省自然科学基金项目(20212BAB211001) （20212BAB211001）
核资源与环境国家重点实验室开放基金项目(2022NRE14) （2022NRE14）
江西省博士后择优资助项目(2021KY52) （2021KY52）
云南省地球系统科学重点实验室开放课题(ESS2021005) （ESS2021005）
