Digital Image Processing and Analysis Techniques for Detection of Hydrothermal Alteration Zones: A Case Study in Siah-Jangal Area, North of Taftan Volcano, Southeastern Iran

Mokhtari, Zahra; Boomeri, Mohammad; Bagheri, Sasan

doi:10.1007/s12524-014-0422-4

Cited by 11 publications

(2 citation statements)

References 27 publications

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“…The PCA reduces spectral redundancy in multispectral data, segregates noise components and creates a new set of images that enhanced interest targets based on input bands and their combination in the new PCs. This well-known method is widely used for mapping hydrothermal alteration using Landsat data (e.g., Abrams et al, 1983;Bennett et al, 1993;Tangestani & Moore, 2001;Ranjbar et al, 2004;Mia & Fujimitsu, 2012;Corumluoglu et al, 2015;Mokhtari et al, 2015).…”

Section: Pcamentioning

confidence: 99%

“…The Landsat-7 Enhanced Thematic Mapper plus (ETM+) was successfully launched on April 15, 1999 (Markham et al, 2008) and has been providing multispectral observations ever since. Since the Landsat-7 was put into orbit, much research has been successfully conducted for hydrothermal alteration mapping by taking advantage of the ETM+ images, especially in arid and semiarid regions (e.g., Ranjbar et al, 2004;Mia & Fujimitsu, 2012;Sadeghi et al, 2013;Mokhtari et al, 2015). Landsat-8, carrying the Operational Land Imager (OLI) and the Thermal Infrared Sensor (TIRS), was launched on 4 February 2013 (Roy et al, 2014;Poursanidis et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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A Comparative Study of Landsat‐7 and Landsat‐8 Data Using Image Processing Methods for Hydrothermal Alteration Mapping

et al. 2016

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Comparing spaceborne satellite images of Landsat‐8 Operational Land Imager (OLI) and Landsat‐7 Enhanced Thematic Mapper plus (ETM+) was undertaken to investigate the relative accuracy of mapping hydrothermal alteration minerals. The study investigated the northern part of Rabor, which contains copper mineralization occurrences, and is located in the Kerman Cenozoic magmatic assemblage (KCMA), Iran. Image processing methods of band ratio, principal component analysis (PCA), and spectral angle mapper (SAM) were used to map the distribution of hydrothermally altered rocks associated with the porphyry copper mineralization. The band ratio combination of both sensors for mapping altered areas showed similar outcomes. PCA exposed variations in the spatial distribution of hydroxyl‐bearing minerals. The representation of hydrothermal areas using OLI data was more satisfactory than when using ETM+ data. SAM analysis found similar results for mapping hydroxyl‐bearing zones. Verification of the results came through ground investigation and laboratory studies. Rock samples (n = 56) were collected to validate results using thin sections, X‐ray diffraction (XRD) and spectral analyses. Field observations and laboratory analysis revealed that phyllic and propylitic alterations dominate the alteration zones in the study area. Argillic and iron oxides/hydroxides alterations were observed to a lesser degree. The results indicate that alteration maps prepared by OLI data using PCA for visual interpretation are more suitable than those of ETM+ due to a higher radiometric resolution and lower interference between vegetation and altered areas. As the spectral bandwidth of ETM+ band 7 covers absorption feature of propylitic alteration, better mapping of propylitic alterations is achieved using ETM+ data.

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