混合矿物组合光谱在蚀变矿物填图中的应用——以云南香格里拉地区Hyperion数据蚀变矿物填图为例  

Application of Combined Spectra of Mixed Minerals to Mapping Altered Minerals:A Case Study in the Yunnan Region Based on Hyperion Data

作　　者：田丰[1] 董丽娜[2] 杨苏明[2] 王润生[2] 

机构地区：[1]中国地质大学(北京),北京100083 [2]中国国土资源航空物探遥感中心,北京100083

出　　处：《地质与勘探》2010年第2期331-337,共7页Geology and Exploration

基　　金：大调查项目:中国地质调查局地质大调查项目"中热红外多/高光谱矿物填图及遥感异常信息提取技术应用研究"(1212010660601)

摘　　要：由于自然界中矿物的共生组合具有一定的规律性,因此,在地质找矿和蚀变矿物填图中,蚀变矿物组合和分带往往比单一的蚀变矿物更具有指导和决策意义。根据矿物在岩石、矿石或蚀变带中的共生和伴生组合规律及工作的地质目标,将某些不易区分且又不必要区分的矿物作为一个矿物组合进行识别,在混合光谱分解中亦作为一个端元进行计算,是解决矿物混合光谱的另一种有效途径。本文使用云南香格里拉地区的hyperion高光谱数据,以提取褐铁矿+绢云母的识别矿物组合作为矿物填图研究的组合端元矿物目标,对云南高海拔地区的岩石蚀变信息进行了提取和分析,制作了遥感蚀变异常图,并在图中蚀变提取异常的研究区实地考察并与提取信息作了比较。识别结果表明:研究区山头海拔高度基本都在4000m以上,原始植被较少,岩石露头较多,虽然受各种干扰较大,但提取出了比较满意的效果,进而可以其它知识的辅助下,可以实现对成矿远景区以及靶区的圈定。In nature,coexistence and combination of minerals have definite rules.Thus the combination and subdivision of altered minerals are more important than single ones in geological mapping and survey.Based on such rules and geological purposes,some minerals,that are not easy or necessary to distinguish,can be identified as one set of minerals.And they are calculated as an end member in decomposition of mixed spectra.This is another approach to solve mixed spectra of minerals.In this work we use the Hyperion spectral data in the Xiangelila area,Yunnan province to identify the mineral combination of limonite and sericite.Then we obtain and analyze the data of altered rocks in high-elevation areas of Yunnan and prepare maps of remote sensing alternation.And we conducted field investigations at the sites where alternation anomalies were extracted from the map.The identification result shows that the study area has mountains over 4000 m,little vegetation and many outcrops.Although the interferences are large,information extraction has attained satisfactory results.With help of other data,this method can be used to delineate prospective mineralization and target areas.

关 键 词：饰变矿物 高光谱 FLAASH MNF变换 MTMF 

分 类 号：P627[天文地球—地质矿产勘探]