基于ASTER与Sentinel-2A融合数据的云南普朗铜矿化蚀变信息提取  

Extraction of Mineralization Alteration Information from ASTER and Sentinel-2A Remote Sensing Fusion Data in the Pulang Copper Mine of Yunnan Province

作　　者：陈琪[1,2,3,4] 赵志芳 姜琦刚[5] 夏既胜 孙涛[1] 曾诗卉[1,3,4] CHEN Qi;ZHAO Zhifang;JIANG Qigang;XIA Jisheng;SUN Tao;ZENG Shihui(School of Earth Sciences,Yunnan University,Kunming,Yunnan 650500;Institute of International Rivers and Eco-Security,Yunnan University,Kunming,Yunnan 650500;Engineering Research Center of Domestic High-Resolution Satellite Remote Sensing Geology for Universities of Yunnan Province,Kunming,Yunnan 650500;MLR Key Laboratory of Sanjiang Metallogeny and Resources Exploration&Utilization,Kunming,Yunnan 650051;College of Geoexploration Science and Technology,Jilin University,Changchun,Jilin 130000)

机构地区：[1]云南大学地球科学学院,云南昆明650500 [2]云南大学国际河流与生态安全研究院,云南昆明650500 [3]云南省高校国产高分卫星遥感地质工程研究中心,云南昆明650500 [4]国土资源部三江成矿作用与资源勘查利用重点实验室,云南昆明650051 [5]吉林大学地球探测科学与技术学院,吉林长春130000

出　　处：《地质与勘探》2021年第4期728-738,共11页Geology and Exploration

基　　金：国家自然科学基金项目(编号:41462015、41872251和42061038)资助。

摘　　要：云南普朗铜矿区是我国提高战略性金属矿产铜矿资源的主要潜力地段,该矿区位于多云多雨山地高原区,采用传统地面调查方法开展找矿勘查工作受限较大,而遥感技术可在其中发挥重要作用。鉴于此,本研究选取ASTER和Sentinel-2A多光谱遥感数据,在光谱协同统一两种数据源的地表反射率基础上,采用高通滤波(High-Pass Filtering,HPF)的融合方法兼顾两种数据在短波红外波段和可见光近红外波段的优势,获取了具有高空间分辨率和高光谱保真度的ASTER-Sentinel-2A融合数据集;进而利用“比值+主成分分析法”与“主成分分析+能谱-面积法”,开展了普朗铜矿区矿化遥感蚀变信息识别,并通过深入分析及野外验证,提出了对普朗铜矿蚀变信息分布特征及找矿潜力地带的新认识:(1)在原蚀变填图工作中判定为青磐岩化带的东部区域,重新进行了蚀变带的划分;(2)东部区域中新划分的钾化硅化带和绢英岩化带,具有较大找矿潜力。本研究可为普朗铜矿找矿勘查提供参考。The Pulang copper mine of Yunnan Province is a major potential area of the strategic metal mineral copper resources in China.It is located in a mountainous and plateau area with often cloudy and rainy weather.The traditional ground survey method is limited in prospecting in this district,and remote sensing technology can play an important role in this operation.In this work,ASTER and sentinel-2A data,which are freely available and complementary,are used to unify surface reflectances through spectrum collaboration.Then,ASTER-Sentinel-2A fusion data with high spatial resolution and high spectral resolution are obtained by the high-pass filtering(HPF)fusion method.The optimized“Ratio+PCA”and“PCA+S-A”are used to extract mineralization alteration information from remote sensing data.Through in-depth analysis and field verification,a new understanding to the Pulang porphyry copper mine is proposed as follows.(1)The alteration zone should be redivided in the eastern area which has been determined to be a propylitic zone in original alteration mapping.And(2)it is speculated that the newly divided potassium-silicified and sericitization belts in the eastern region have great prospecting potential.This study can provide a scientific basis for further prospecting in the Pulang copper mine.

关 键 词：遥感蚀变 图像融合 ASTER Sentinel-2A 普朗铜矿 云南省 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]