Landsat8 OLI数据斑岩铜矿遥感蚀变矿物组合提取研究  

Extraction of hydrothermal alteration mineral groups of porphyry copper deposits using Landsat8 OLI data

作　　者：汪子义 张廷斌[1,2,3] 易桂花 钟康惠[1] 别小娟[1] 王继斌[1] 孙姣姣[1] WANG Ziyi;ZHANG Tingbin;YI Guihua;ZHONG Kanghui;BIE Xiaojuan;WANG Jibin;SUN Jiaojiao(College of Earth Sciences,Chengdu University of Technology,Chengdu 610059,China;College of Engineering and Technical,Chengdu University of Technology,Leshan 614000,China;Key Laboratory of Geoscience Spatial Information Technology,Ministry of Nature Resources,Chengdu 610059,China)

机构地区：[1]成都理工大学地球科学学院,成都610059 [2]成都理工大学工程技术学院,乐山614000 [3]自然资源部地学空间信息技术重点实验室,成都610059

出　　处：《国土资源遥感》2018年第3期89-95,共7页Remote Sensing for Land & Resources

基　　金：国家自然科学基金项目"西藏典型斑岩型铜矿床遥感蚀变信息重现性机理研究"(编号:41202233);自然资源部公益性行业科研专项"斑岩-浅成低温热液成矿系统研究及勘查评价示范--以西藏多龙整装勘查区为例"(编号:201511017);中国地质调查局地质调查项目"西藏物玛-先遣地区斑岩型铜金矿成矿规律研究与找矿靶区优选"(编号:12120113095300)共同资助

摘　　要：Landsat8 OLI数据NIR波段(0. 845~0. 885μm)和SWIR2波段(2. 100~2. 300μm)波谱分辨率的提高,已分别成为含Fe^(3+)类、Al-OH类和Mg-OH类蚀变矿物的诊断性谱段。通过利用混合调制匹配滤波(mixture tuned matched filtering,MTMF)方法,开展多龙矿集区铁格隆远景区含Fe^(3+)类、Al-OH类和Mg-OH类蚀变矿物信息提取研究,并与Hyperion数据蚀变矿物信息提取结果进行对比分析。研究结果表明,基于Landsat8 OLI提取的3类蚀变矿物较为可靠;铁格隆远景区蚀变矿物组合的空间分布与斑岩铜矿经典蚀变分带特征基本吻合;遥感蚀变分带由内而外分别为绢英岩化+泥化带(Al-OH类蚀变矿物)和青磐岩化带(Mg-OH类蚀变矿物),Fe^(3+)矿物组合则分布在绢英岩化+泥化带和青磐岩化带之间或过渡带上。The enhancing of NIR band and SWIR2 band of OLI data makes the spectra become the diagnostic spectra of ferric iron minerals,Al-OH and Mg-OH alteration minerals.The authors used the mixture tuned matched filtering(MTMF)mapping method to extract ferric iron,Al-OH and Mg-OH alteration minerals in Tiegelong prospective block of the Duolong porphyry Cu-Au ore concentration area.Compared with the results of mineral mapping from Hyperion data,the three mineral mapping types extracted from Landsat8 OLI are reliable.At the same time,the spatial distribution pattern of alteration minerals agrees with the hydrothermal alteration zone of typical porphyry copper deposits.The remote sensing alteration zones from interior to exterior of the Tiegelong porphyry Cu ore block are phyllic+argillic zone(Al-OH minerals)and propylitic zone(Mg-OH minerals),and the ferric iron minerals are between the arephyllic+argillic and propylitic zones.

关 键 词：OLI 斑岩铜矿 蚀变分带 MTMF 遥感 铁格隆 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]