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001-es BibID:BIBFORM126013
Első szerző:Daoud Abazar Mohamed Ahmed (földtudományi kutató, geológus, geográfus)
Cím:Remote sensing and gravity investigations for barite detection in Neoproterozoic rocks in the Ariab area, Red Sea Hills, Sudan / Daoud, Abazar M.A.; Shebl, Ali; Abdelkader, Mohamed M.; Mohieldain, Ali Ahmed; Csámer, Árpád; Satti, Albarra M.N.; Rózsa, Péter
Dátum:2024
ISSN:2352-9385
Megjegyzések:The increasing global demand for barite, driven by its geological importance and various industrial applications, advises the scientific community to improve attempts to identify and explore its deposits in different geological settings. This boost in interest aims to ensure sustainable supply by locating new sources and better understanding the conditions in which barite forms. This study presents an integrated approach using multispectral (Landsat 8 & 9, Sentinel-2, and ASTER) and hyperspectral (PRISMA) remote sensing data, along with geophysical gravity data, to improve the localization of barite deposits. Several image processing methods, including false colour composites, principal component analysis, band ratios, minimum noise fraction, and spectral analysis, were employed for the discrimination of barite deposits, revealing their association with felsic rocks (referred to as group C). Additionally, lineament extraction was performed using the recent and advanced different filters like Tilt Angle Horizontal Gradient (TAHG) and Enhanced Horizontal Gradient Amplitude (EHGA) on Bouguer anomalies, highlighting the structural control of barite deposits by the D3 deformation phase. Field investigations were conducted to validate our findings. Based on these field observations, the integrated methodology successfully mapped the distribution of barite and its host rocks, resulting in an updated geological map for barite distribution that can be used in further exploration phases. We strongly recommend the adopted approach and the newly proposed image combinations for preliminary explorations of barite in similar arid terrains.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Barite
Remote sensing
Felsic rocks
Enhanced horizontal gradient amplitude (EHGA)
Bouguer anomalies
Megjelenés:Remote Sensing Applications: Society and Environment. - 37 (2025), p. 1-27. -
További szerzők:Shebl, Ali (1992-) (geológus) Abdelkader, Mohamed M. Mohieldain, Ali Ahmed Csámer Árpád (1976-) (geológus) Satti, Arshad Mehmod Rózsa Péter (1956-) (petrográfus)
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2.

001-es BibID:BIBFORM125954
Első szerző:Daoud Abazar Mohamed Ahmed (földtudományi kutató, geológus, geográfus)
Cím:Integrated Multi-Sensor Remote Sensing and Geophysical Data for Barite Potential Mapping in Ariab Districts, Northeast Sudan / Abazar Daoud, Ali Mohieldain, Mohamed Abdelkader, Ali Shebl, Aya Shereif, Albarra Satti, Péter Rózsa
Dátum:2024
Megjegyzések:Extensive scientific inquiries into barite have escalated due to increasing global demand, prompted by its resourceful applications in crucial industries and its association with mineralization of gold and copper. The current re-search utilizes a combination of multi-sensor approaches (Landsat 9 and PRISMA) along with the free satellite gravity data to optimize the detection and delineation of the barite deposit in the Sudanese part of the Nubian Shield. Techniques such as false color composites (FCC), principal compo-nent analysis (PCA), band ratios (BR), minimum noise fraction (MNF), Total Horizontal Gradient (THG), the Second Vertical Derivatives (SVD), and spectral analysis were utilized to distinguish lithological features, displaying the barite occur in association with acidic metavolcanic rocks within the Ari-ab district. Additionally, the gravity methods delineate structurally controlled barite mineralization associated with the north-east deformation phase. Our results were validated through comprehensive field investigations; the find-ings were exceptionally robust , enhancing the development of an updated map delineating additional prospective zones for barite deposits within the study area. The integrated geospatial, hyperspectral, and gravity data are strongly recommended for reconnaissance exploration of barite in other simi-lar regions.
Tárgyszavak:Természettudományok Földtudományok előadáskivonat
könyvrészlet
Landsat 9
PRISMA
Total Horizontal Gradient
Second Vertical Derivatives
Barite
Megjelenés:Mediterranean Geosciences Union (MedGU) 4th annual meeting. - accepted for publication : - (2024), p. 1. -
További szerzők:Mohieldain, Ali Ahmed Abdelkader, Mohamed M. Shebl, Ali (1992-) (geológus) Shereif, Aya S. (1994-) (Geologist) Satti, Albarra Rózsa Péter (1956-) (petrográfus)
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3.

001-es BibID:BIBFORM124179
Első szerző:Daoud Abazar Mohamed Ahmed (földtudományi kutató, geológus, geográfus)
Cím:Relationship between petrography and geomechanical properties of the sandstone: A case study from Wadi Halfa, North Sudan / Daoud, Abazar M. A.; Abdelkader, Mohamed M.; Sediek, Kadry N.; Elsharief, Ahmed M.; Rashed, Mohamed A.; Elamein, Abdelaziz M.; Abdalrahiem, Khaled O.; Rózsa, Péter
Dátum:2024
ISSN:2062-0810 2063-4269
Megjegyzések:The investigation of the effect of petrography and diagenetic features on the geomechanical properties of the sandstone and their relationship to rock failure are of vital importance for different construction projects. The present study involves analyzing multi-vertical lithofacies profiles around the region of Wadi Halfa, North Sudan. The sandstone is dominantly composed of monocrystalline quartz grains (60%) accompanied by some polycrystalline quartz, feldspars, lithic fragments, micas, and heavy minerals. Iron oxides are the main type of cementing materials (14%), with some (2%) of carbonates and clay minerals. The average porosity of all studied samples is 12%. The compressive strength ranges widely, influenced by weathering, grain size, cementing materials, and bedding planes. The uniaxial compressive strength is more influenced by wetting when the load is parallel to bedding planes. Sandstone anisotropy is suggested by a U-shaped curve, with lower values at 458 and higher values at 908 and 08. The geomechanical behavior of rocks masses in Wadi Halfa was evaluated through a combination of field and laboratory analyses which revealed a variable Rock Mass Rating (RMR) ranging from 58 to 92 and a Geological Strength Index (GSI) ranging from 33 to 61.
Tárgyszavak:Természettudományok Földtudományok idegen nyelvű folyóiratközlemény hazai lapban
folyóiratcikk
sandstone
compressive strength
anisotropy
post-specimen failure
softness coefficient
RMRGSI
Megjelenés:International Review of Applied Sciences and Engineering. - [Epub ahead of print] (2024), p. 1-17. -
További szerzők:Abdelkader, Mohamed M. Sediek, Kadry N. Elsharief, Ahmed M. Rasheed, Mohammed Elamein, Abdelaziz M. Abdalrahiem, Khaled O. Rózsa Péter (1956-) (petrográfus)
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