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001-es BibID:BIBFORM107208
035-os BibID:(WoS)000872370100001 (Scopus)85140010447
Első szerző:El-Desoky, Hatem M.
Cím:Multiscale mineralogical investigations for mineral potentiality mapping of Ras El-Kharit-Wadi Khashir district, Southern Eastern Desert, Egypt / Hatem M. El-Desoky, Ali Shebl, Ahmed M. Abdel-Rahman, Wael Fahmy, Hamada El-Awny, Anas M. El-Sherif, Mahmoud M. El-Rahmany, Árpád Csámer
Dátum:2022
ISSN:1110-9823 2090-2476
Megjegyzések:Through various scales of observation, ranging from remote sensing data, field investigations, hand specimens, microscopic petrographic examinations, XRD, to SEM, indicators of various mineralization types are highlighted in Ras El-kharit-wadi Khashir (Eastern Desert, Egypt). Systematic remote sensing explo- ration of the mineralized zones is performed through integrating Sentinel 2 and ASTER datasets. False- color combinations, informative band ratios, relative absorption band depth, and CEM techniques were applied to discriminate rock units and various types of hydrothermal alterations. Moreover, ALOS PALSAR DEM was utilized to decipher the structural lineaments. Intensive field investigations confirmed hydrothermally altered zones that were picked out through remote sensing analysis and revealed that the study area is affected by cataclastic metamorphism to some extent. Magmatic and metamorphic rock types are represented by propylitic, phyllic, argillic, and silicification zones. Sericitization, chloritization, epidotization, kaolinitization, carbonatization, and silicification are recorded utilizing petrographic and remote sensing investigations. Moreover, the current study reveals that the detected alteration is the main reason for the apparent wide range of petrographic characteristics of each rock type and bearing several opaque minerals, such as pyrite, magnetite, titanomagnetite, chalcopyrite, arsenopyrite, covellite, galena, goethite, and hematite. Most of these opaques were identified using ore microscopy, XRD, and SEM. The distribution of hydrothermal alterations, representative samples bearing mineralization, structurally dissected zones are integrated to build a mineral potentiality map of the study area. The resultant MPM was confirmed via field survey and emphasized the usefulness of the current integrated approach besides highlighting about 125 km2 as potential mineralized zones.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Sentinel 2
ASTER
Hydrothermal alteration
Ore mineralogy
Eastern desert
Megjelenés:Egyptian Journal of Remote Sensing and Space Science. - 25 : 4 (2022), p. 941-960. -
További szerzők:Shebl, Aly (1992-) (geológus) Abdel-Rahman, Ahmed M. Fahmy, Wael El-Awny, Hamada El-Sherif, Anas M. El-Rahmany, Mahmoud M. Csámer Árpád (1976-) (geológus)
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2.

001-es BibID:BIBFORM113375
035-os BibID:(cikkazonosító)826 (WoS)001017187600001 (Scopus)85163963917
Első szerző:Shebl, Aly (geológus)
Cím:Impact of DEMs for Improvement Sentinel 2 Lithological Mapping Utilizing Support Vector Machine: A Case Study of Mineralized Fe-Ti-Rich Gabbroic Rocks from the South Eastern Desert of Egypt / Ali Shebl, Hatem M. El-Desoky, Ahmed M. Abdel-Rahman, Wael Fahmy, Hamada El-Awny, Anas El-Sherif, Mahmoud M. El-Rahmany, Árpád Csámer
Dátum:2023
ISSN:2075-163X
Megjegyzések:Fused remote sensing datasets have greatly contributed to enhancing lithological targets and providing significant information for mineral exploration. For instance, multispectral datasets can discriminate rock units through their unique spectral signatures. Digital Elevation Models (DEMs) could be an effective tool boosting lithological discrimination based mainly on their topographic variations. Consequently, the current study applied the power of the support vector machine (SVM) algorithm and the integrated Phased Array L-type band Synthetic Aperture Radar (PALSAR) DEM and multispectral Sentinel 2 data to: 1-Create an updated lithological map of a poorly mapped arid terrain (Khashir-Ras El-Kharit district, Eastern Desert of Egypt), and 2-Compare and assess the distribution of ferrogabbros with the aim of improving the localization of these rock bodies and investigating their mineral content. Our results enhanced the lithological mapping and revealed a better generalization of mineralized ferrogabbros when the input was a fused DEM with Sentinel 2 compared to the salt and pepper effect observed when adopting the Sentinel 2 solely as the input data. Additionally, the current research strongly recommends detailed exploration programs for Fe-Ti oxide ores within the gabbroic rocks delineated through the resultant thematic map. The ferrogabbros were subjected to a comprehensive analysis involving whole rock geochemistry, XRD, EDX, and lightreflecting investigations, which revealed the existence of magnetite, titanomagnetite, and hematite. The titanomagnetite crystals display subhedral morphology and exhibit fine- to medium-grained surfaces with irregular shapes. X-ray diffraction (XRD) analysis revealed the presence of magnetite and hematite in the concentrated Fe-Ti oxides. Additionally, the whole rock geochemistry highlighted the origin of the ferrogabbros and their proposed tectonic setting as an alkaline to calc-alkaline magma type that developed in a continental arc setting
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
lithological mapping
Sentinel 2
DEMs
Eastern Desert
gabbroic rocks
Fe-Ti oxides
Megjelenés:Minerals. - 13 : 6 (2023), p. 1-36. (cikkazonosító) 826-. -
További szerzők:El-Desoky, Hatem M. Abdel-Rahman, Ahmed M. Fahmy, Wael El-Awny, Hamada El-Sherif, Anas M. El-Rahmany, Mahmoud M. Csámer Árpád (1976-) (geológus)
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
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