TITLE:
Application of Different Image Processing Techniques on Aster and ETM+ Images for Exploration of Hydrothermal Alteration Associated with Copper Mineralizations Mapping Kehdolan Area (Eastern Azarbaijan Province-Iran)
AUTHORS:
Golchin Hajibapir, Mohammad Lotfi, Afshar Zia Zarifi, Nima Nezafati
KEYWORDS:
Kehdolan Area, False Color Composite, Band Ratios, Color Ratio Composite, Principal Component Analysis, Crosta Technique, Supervised Spectral Angle Mapping, ASTER Data, ETM+ Data, Alteration
JOURNAL NAME:
Open Journal of Geology,
Vol.4 No.11,
November
28,
2014
ABSTRACT: The Kehdolan area is located at 20 kilometers to thesouth-east of Dozdozan Town (Eastern Azarbaijan Province).
According to structural geology, volconic rocks are situated in
Alborz-Azarbyjan zone, and faultsareobservedinthesame direction to this system with SE-NW trend. The results
show that kaolinite alteration trend with Argilic and propylitic veinsis thesame direction with SW-NE faults in this area. Therefore,
these faults with these trends can be considered as the mineralization control
for determination of the alterations. Different image processing techniques,such as false color composite(FCC), band ratios, color
ratio composite(CRC), principal componentanalysis(PCA), Crosta technique, supervised spectral angle mapping(SAM), are used foridentification of the
alteration zones associated with copper mineralization. In this project ASTERdata are process and spectral analysis to fit for recognizing intensity
and kind of argillic, propylitic,philic, and ETM+ datawhichare process and to fit for iron oxide and relation to metal
mineralization of the area. For recognizing different alterations of the study
area, some chemical and mineralogical analysis data from the samples showed
that ASTER data and ETM+ data werecapable of hydrothermal
alteration mapping with copper mineralization.Copper mineralization in the region is in agreement with argillic
alteration. SW-NE trending faults controlled the mineralization process.