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Remote Sensing for Land & Resources    2019, Vol. 31 Issue (1) : 229-236     DOI: 10.6046/gtzyyg.2019.01.30
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An improved method for extracting alteration related to the ductile shear zone type gold deposits using ASTER data
Jianyu LIU1,2, Ling CHEN2(), Wei LI2, Genhou WANG1, Bo WANG1
1.School of Earth Science and Resources, China University of Geosciences(Beijing), Beijing 100083, China
2.China Aero Geophysical Survey and Remote Sensing Center for Natural Resources, Beijing 100083, China
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Abstract  

The Beishan rift is an important metallic zone in China. The principal analysis component (PCA) technique and band ratio were used to extract alteration information related to gold deposits in the study areas in Hongshijing region and south of Cihai region lying in the west of Beishan rift. As a result of regional metamorphism, the alteration zones extracted by PCA and band ratios contain a great deal of interference information. With the method proposed in this study, most useless alteration information was eliminated and the gold deposits were located at or near the selected alteration areas in Hongshijing region. To prove the capability of this method, the authors validated the selected alteration areas south of Cihai region by fieldwork and found two gold ore spots. It is concluded that this method is effective in eliminating useless alteration information and thus is recommended for application in similar geological settings in Beishan rift.
Keywords ASTER data      Beishan rift      selection of alteration zone      gold deposit     
:  TP79  
Corresponding Authors: Ling CHEN     E-mail: chenling010@126.com
Issue Date: 14 March 2019
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Jianyu LIU
Ling CHEN
Wei LI
Genhou WANG
Bo WANG
Cite this article:   
Jianyu LIU,Ling CHEN,Wei LI, et al. An improved method for extracting alteration related to the ductile shear zone type gold deposits using ASTER data[J]. Remote Sensing for Land & Resources, 2019, 31(1): 229-236.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2019.01.30     OR     https://www.gtzyyg.com/EN/Y2019/V31/I1/229
Fig.1  Sketch regional geological map of the Beishan orogenic belt and the locations of research areas[2]
Fig.2  Image spectrum of the metagabbro before and after FLAASH atmospheric correction and the spectrum measured by ASD
Fig.3  Resampled spectra of the typical altered minerals
主成分分量 B1 B3 B8 B9
PC1 -0.518 738 -0.612 492 -0.443 863 -0.398 434
PC2 -0.387 350 -0.447 231 0.507 629 0.626 304
PC3 -0.753 544 0.651 793 -0.066 844 0.053 567
PC4 0.114 206 0.001 723 -0.735 412 0.667 925
Tab.1  PCA eigenvecter matrix of ASTER B1,B3,B8 and B9
主成分分量 B1 B4 B6 B7
PC1 -0.315 780 -0.599 590 -0.512 250 -0.527 610
PC2 -0.869 520 -0.121 970 0.276 135 0.390 918
PC3 -0.375 520 0.747 630 -0.086 510 -0.540 880
PC4 -0.056 710 0.258 196 -0.808 620 0.525 602
Tab.2  PCA eigenvecter matrix of ASTER B1,B4,B6 and B7
主成分分量 B1 B5 B8 B9
PC1 -0.336 957 -0.561 742 -0.518 172 -0.549 912
PC2 -0.932 867 0.092 350 0.255 631 0.236 398
PC3 -0.126 436 0.786 893 -0.575 168 -0.184 378
PC4 0.015 289 -0.238 152 -0.579 079 0.779 562
Tab.3  PCA eigenvecter matrix of ASTER B1,B5,B8 and B9
Fig.4  Extraction results of alteration information by ASTER in two study areas
Fig.5  Results of ferric alteration anomaly in two study areas
Fig.6  Results of selected anomalies
Fig.7-1  Photos of the fieldwork in south of Cihai region and photomicrograph of the meta-granite and spectra of the samples measured by ASD
Fig.7-2  Photos of the fieldwork in south of Cihai region and photomicrograph of the meta-granite and spectra of the samples measured by ASD
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