Evaluation of geophysics and spaceborne multispectral data for alteration mapping in the Sar Cheshmeh mining area, Iran

The Sar Cheshmeh porphyry copper deposit is located in the Central Iranian Volcanic-Sedimentary Belt (CIVSB). The hydrothermal alteration zones are well developed within and around the porphyry stock. Given the poor soil and vegetation cover in this area, we evaluated the usefulness of multispectral...

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Bibliographic Details
Published in:	International journal of remote sensing 2011-01, Vol.32 (12), p.3309-3327
Main Authors:	Ranjbar, H, Masoumi, F, Carranza, E. J. M
Format:	Article
Language:	eng
Subjects:	Advanced Spaceborne Thermal Emission and Reflection Radiometer Airborne sensing Alterations Animal, plant and microbial ecology Applied geophysics Biological and medical sciences data collection Earth sciences Earth, ocean, space Exact sciences and technology Fundamental and applied biological sciences. Psychology General aspects. Techniques Geophysics Internal geophysics Mapping mining principal component analysis Remote sensing rocks soil Synthetic aperture radar Teledetection and vegetation maps vegetation cover
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Summary:	The Sar Cheshmeh porphyry copper deposit is located in the Central Iranian Volcanic-Sedimentary Belt (CIVSB). The hydrothermal alteration zones are well developed within and around the porphyry stock. Given the poor soil and vegetation cover in this area, we evaluated the usefulness of multispectral remote sensing data derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Enhanced Thematic Mapper Plus (ETM⁺) images and airborne magnetic–radiometric data for hydrothermal alteration mapping at a local scale. Principal component analysis (PCA), band ratios and the spectral angle mapper (SAM) technique were applied to the multispectral data sets to map hydrothermally altered rocks. PCA and band ratios were also applied to the airborne geophysical data. The overall results showed that the multispectral remote sensing data sets resulted in more accurate hydrothermal alteration mapping and lithological discrimination in the study area as compared with the airborne geophysical data. The radiometric data are also useful in enhancing areas with potassic alteration.
ISSN:	1366-5901 0143-1161 1366-5901