Mapping hydrothermal alteration zones using ASTER images in the Arabian–Nubian Shield: A case study of the northwestern Allaqi District, South Eastern Desert, Egypt

El-Desoky, Hatem M.; Soliman, Nehal; Heikal, Mohamed Ahmed; Abdelrahman, Ahmed S.

doi:10.1016/j.jaesx.2021.100060

Cited by 6 publications

(1 citation statement)

References 28 publications

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“…Porphyry deposits are generally associated with zonation of propylitic, argillic, phyllic, and potassic hydrothermal alteration. These hydrothermal deposits can be detected by remote sensing data using the spectral properties of minerals alteration that have specific wavelengths in the range of 2.0–2.5 μm (Sabins 1999; Abrams et al 2002; Gabr et al 2010; Ranjbar et al 2011; Pour and Hashim 2012; Beiranvand Pour and Hashim 2014; Wambo et al 2020; El-Desoky et al 2021; Mamouch et al 2022). The propylitic alteration is manifested by the presence of chlorite, epidote, and calcite, which have a specific absorption at 2.35 μm.…”

Section: Introductionmentioning

confidence: 99%

Mapping of favourable mining areas in the Tiouit area by multispectral remote sensing and airborne gamma-ray spectrometry coupled with geochemical data (Eastern Anti-Atlas, Morocco)

Miftah

Azzab

Attou

et al. 2022

Applied Earth Science

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The current investigation concern Tiouit region in order to perceive potential mining zones. Remote sensing data were the main component to process. In order to spot geochemical anomalies associated with the target zones, multispectral ASTER data, gamma-ray spectrometry, and stream sediment data were used. Crosta and SAM applications granted to map a spatial distribution of propylitic, phyllic, clay, and ferruginous alteration zones. The normalized ratios let the delineation of potassic alteration zones, including the Tiouit gold mine characterized by an intense alteration in the Ikniwn granodiorite. Thus, the potassic alteration zones are consistently co-located with the tectonic structures materialized by strong fracturing densities. The stream sediment geochemical investigation revealed that the cited areas have an important potential of mineralization, with high concentrations of As (136 g/t), Cu (91 g/t), Pb (141 g/t), Zn (392 g/t), Ag (3 g/t), Mo (11 g/t), Mn (0.2 g/t), and Fe (10.63 %).

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