高光谱遥感在硅化带识别中的应用
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摘要
硅化带是多个矿种的找矿指示性信息,快速地大面积探测硅化带信息是遥感技术在地质找矿应用领域一项重要的应用。随着遥感技术的不断发展,针对不同的遥感数据,出现了多种不同的硅化带提取方法。首先通过分析JHU(约翰霍普金斯大学)波谱库中10多种不同Si O_2的岩性光谱特征,研究与Si O_2含量密切相关的波段;其次,使用热红外地面光谱仪102F实测的样品光谱和样品的地球化学数据(Si O_2含量),通过线性回归方程统计出Si O_2含量的计算公式;最后,使用该公式对TASI航空高光谱热红外数据进行处理,获取研究区Si O_2含量图,提取高Si O_2条带;并在进行野外验证。实验结果表明:8.62μm和9.25~9.5μm是Si O_2含量相关性极大的波段;TASI(thermal airborne hyperspectral imager)数据中有多个Si O_2对应的波谱特征,B6(8.62μm)的发射峰、B6两侧的斜坡及B14、B17左侧的斜坡与Si O_2呈正相关关系;该方法提取研究区高Si O_2条带非常精确,在花岗岩区亦能识别出硅化带。
Silicified zone is close to several kinds of ores,and extracting spectral information of silification fast and largely is a significant application of remote sensing in geological prospecting. With the development of remote sensing technology,kinds of methods are proposed to extract silicified zone because of different data. Firstly,more than 10 kinds of rocks with different Si O_2 of JHU( Johns Hopkins University) Spectral Library were analyzed,and point out several bands which are closely related to Si O_2 content. Secondly,102 F was used to measure spectrum of samples and formula to compute Si O_2 was obtain by linear regression with the spectrum and Si O_2 content of samples. Finally,TASI data was used to extract silicified zone to verify the relation between the bands and Si O_2 content,Si O_2 content map of study area was obtained,high Si O_2 belts were extracted from the map and field work prove that they are right. Thus,conclusions are drawn that( 1) 8. 62 μm and 9. 25-9. 5 μm are closely related to Si O_2 content,( 2) that several spectral feature of Si O_2 are in TASI data,( 3) that the emission peak at B6( 8. 62μm),the slope at both side of B6 and the left side of B14 and B17 have positive correlation with Si O_2 content,( 4) and that this method is very precise to extract high Si O_2 belts in study area,including granite area.
Silicified zone is close to several kinds of ores,and extracting spectral information of silification fast and largely is a significant application of remote sensing in geological prospecting. With the development of remote sensing technology,kinds of methods are proposed to extract silicified zone because of different data. Firstly,more than 10 kinds of rocks with different Si O_2 of JHU( Johns Hopkins University) Spectral Library were analyzed,and point out several bands which are closely related to Si O_2 content. Secondly,102 F was used to measure spectrum of samples and formula to compute Si O_2 was obtain by linear regression with the spectrum and Si O_2 content of samples. Finally,TASI data was used to extract silicified zone to verify the relation between the bands and Si O_2 content,Si O_2 content map of study area was obtained,high Si O_2 belts were extracted from the map and field work prove that they are right. Thus,conclusions are drawn that( 1) 8. 62 μm and 9. 25-9. 5 μm are closely related to Si O_2 content,( 2) that several spectral feature of Si O_2 are in TASI data,( 3) that the emission peak at B6( 8. 62μm),the slope at both side of B6 and the left side of B14 and B17 have positive correlation with Si O_2 content,( 4) and that this method is very precise to extract high Si O_2 belts in study area,including granite area.
引文
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10 杨杭,张立福,黄照强,等.基于热红外发射光谱的岩石Si O2定量反演模型.光谱学与光谱分析,2012;32(6):1611—1615Yang H,Zhang L F,Huang Z Q,et al.Quantitative inversion of rock Si O2content based on thermal emissivity spectrum.Spectroscopy and Spectral Analysis,2012;32(6):1611—1615
2 张守林.基于ETM数据矿化识别信息定量提取方法研究.北京:中国地质大学,2006Zhang S L.A study on methods used to quantitatively extract mineralized alteration information from ETM data.Beijing:China University of Geosciences,2006
3 杨波,吴德文,赖健清,等.矿化信息提取定量遥感模型的建立:以鹰嘴山硅化蚀变为例.遥感学报,2005;9(6):717—724Yang B,Wu D W,Lai J Q,et al.The Set up of quantitation remote sensing medels for mineralization and alteration:take silicification in yingzuishan gold mine as an example.Journal of Remote Sensing,2005;9(6):717—724
4 二宫芳树,傅碧宏.帕米尔东北缘ASTER多光谱热红外遥感数据的岩性信息提取田.新疆地质,2003;21(1):22—30Ninomiya,Fu B H.Extracting lithologic information from ASTER multispectral thermal infrared data in the northeastern Pamirs.Xinjiang Geology,2003;21(1):22—30
5 闫柏琨,刘胜伟,王润生,等.热红外遥感定量反演地表岩石的Si O2含量.地质通报2006;25(5):640—644Yan Bokun,Liu Shengwei,Wang Runsheng,et al.Study on mechanism of spectrums of rocks and minerals and information extraction method in thermal remote sensing geology.Geoligical Bulletion of China,2006
6 杨长保,朱群,姜琦刚,等.ASTER热红外遥感地表岩石的二氧化硅含量定量反演.地质与勘探,2009;45(6):692—696Yang C B,Zhu Q,Jiang Q G,et al.Silicon dioxide content of surface rock quantify inversion and retrieval by thermal infrared ASTER data.Geology and Exploration,2009;45(6):692—696
7 陈江,王安建.利用ASTER热红外遥感数据开展岩石化学成分填图的初步研究.遥感学报,2007;11(4):601—608Chen Jiang,Wang Jianan.The pilot study on petro chemistry components mapp ing with ASTER thermal infrared remote sensing data.Journal of Remote Sensing,2007;11(4),601—608
8 曾江维.热红外数据(TASI)预处理及矿物信息提取方法研究.北京:中国地质大学,2014Zeng Jiangwei.Study on thermal infrared data(TASI)pretreatment and mineral information extraction method.Beijing:China University of Geosciences,2014
9 Guo Bangjie,Zhang Jielin.Airborne hyperspectral remote sensing technology for polymetallic ore and uranium deposits exploration in east junggar.Acta Geologica Sinica(English Edition),2014;88(s2):1347—1348
10 杨杭,张立福,黄照强,等.基于热红外发射光谱的岩石Si O2定量反演模型.光谱学与光谱分析,2012;32(6):1611—1615Yang H,Zhang L F,Huang Z Q,et al.Quantitative inversion of rock Si O2content based on thermal emissivity spectrum.Spectroscopy and Spectral Analysis,2012;32(6):1611—1615