Prehliadanie podľa Autor "Eldosouky, Ahmed Mohammed"
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Položka Deciphering aeromagnetic data for sustainable sedimentary and structural insights in Obudu Plateau, Ikom Mamfe embayment and Oban Massif, southeastern Nigeria(Nature Publishing Group : London, 2025) Eze, Ohara E.; Ekwok, Stephen Eguba; Thompson, Cherish E.; Odey, Eunice Irmia; Okiwelu, Anthony A.; Abdelrahman, Kamal; Fnais, Mohammed S.; Andráš, Peter; Eldosouky, Ahmed MohammedAeromagnetic data acquired over the Obudu Plateau, Ikom Mamfe embayment, and Oban Massif was analyzed to evaluate the study area’s structural pattern and sedimentary thickness. Data filtering and other enhancement methods with 2-D forward modeling were applied to total magnetic intensity (TMI) data to evaluate the structural pattern, possible mineralization potential, sedimentary thickness, and basement framework disparity. To achieve this aim, several data enhancement techniques such as first vertical derivative (FVD), second vertical derivative (SVD), total horizontal derivative (THD), tilt angle derivative (TAD), analytic signal (AS), upward continuation (UC), low pass filter (LPF), high pass filter (HPF), Centre for Exploration Targeting (CET) and 2-D forward modeling were performed on the TMI data from which the buried subsurface structural lineaments and trends were unraveled. The structural lineaments delineated from the various enhancement operations revealed the major structural orientations of NE-SW. In contrast, the minor geologic structures trend in NNE-SSW, NW-SE, N-S, and E-W directions. These high frequency magnetic anomalies (geologic structures) are caused by post-depositional magmatic intrusions occurring at shallow depth and they have significant control over mineralization. They serve as migration pathways for hydrothermal fluids and accumulation zones for minerals. The depth estimation techniques like source parameter imaging (SPI), standard Euler deconvolution (SED) and 2D forward modelling employed in this study, revealed predominantly shallow depths (< 1400 m). These thin sedimentations are attributed to the widespread presence of Precambrian basement rocks in the Oban Massif and Obudu Plateau as well as the significant basaltic intrusions of Ikom-Mamfe Embayment. Furthermore, the 2-D forward model along the SW-NE profile revealed sediment thickness of 0–700 m overlying intruded metamorphic basement with magnetic susceptibility values ranging from 0.00001 to 0.00625 SI. The model which is highly undulant, revealed two sub-basins separated by the magmatic intrusion.Položka Delineating pixels of natural hydrocarbon micro-seepage induced alterations and anomalies in overlying soils and sediments in ugwueme, with ASTER data and band ratio technique(Hard : Olsztyn, 2024) Enoh, Mfoniso Asuquo; Augustine, Ojanikele Willie; Chiemelu, Ndukwe Emmanuel; Ekwok, Stephen Eguba; Akpan, Anthony E.; Eldosouky, Ahmed Mohammed; Alarifi, Saad S.; Andráš, PeterThe earth’s underlying hydrocarbon-bearing reservoirs frequently leak. These reservoirs leak because of their inadequate sealing, and at high pressure, oil and gas escape vertically or nearly vertically to the earth’s surface as seepage. Micro-seepages on the earth’s surface cause oxidationreduction reactions, which cause anomalies in the soils and sediments beneath them. Remote sensing (RS) and geographic information systems (GIS) are important tools for investigating hydrocarbon micro-seepage-induced changes and anomalies in overlying soil and sediments. In this study, ASTER remote sensing data was adopted to delineate pixels of hydrocarbon micro-seepage-induced anomalies in Ugwueme, south-eastern Nigeria. Band Ratio (BR) was used as a spectral enhancement technique to detect alterations and anomalies in the overlying soil and sediments. ASTER BR of 2/1 improves ferric iron; (5+7)/6 improves clay minerals; (1+4)/(2+3) improves ferrous iron; and 4/(6+9) improves gypsum. The study highlights that BR is an excellent spectral enhancement technique for delineating areas of alterations and anomalies induced by hydrocarbon micro-seepage.Položka Mapping of geological structures and sediment thickness from analysis of aeromagnetic data over the Obudu Basement Complex of Nigeria(Oxford University Press, 2024) Ekwok, Stephen Eguba; Eldosouky, Ahmed Mohammed; Thompson, Edward A.; Ojong, Romeo Akombi; George, Anthony M.; Alarifi, Saad S.; Kharbish, Sherif; Andráš, Peter; Akpan, Anthony E.In this study, geologic structures, as well as attendant orientations and sediment thickness, in the Nigerian Obudu Complex were delineated using the Centre for Exploration Targeting (CET), and depth determination methods such as source parameter imaging (SPI) and standard Euler deconvolution (SED). The CET, SPI, and SED procedures were applied on the total magnetic intensity data. Also, the enhanced TMI data using analytic signal, first-vertical derivative, total-horizontal derivative, and tilt-angle derivative filters were further subjected to CET operation, with the aim of mapping both subtle and prominent lineaments. In general, mapped geologic structures trends in the NE–SW, NNE–SSW, E–W, and N–S directions. Overall, the dominant geologic structural orientations of NE–SW and NNE–SSW reflect the regional strike orientation. The regional striking of the lineation, which is caused by the Pan-African orogeny and subsequent post-orogenic processes, has an impact on these orientations. The N–S and E–W structural deviations from the main NE–SW and NNE–SSW trends are initiated by the YGS of the post-orogenic events. Overall, these complex geologic structures are probable sites for metallogenic minerals.Položka Remote sensing and aeromagnetic mapping for unveiling mineralization potential: Nuqrah Area, Saudi Arabia(Springer Nature Switzerland AG : Cham, 2024) Alarifi, Saad S.; El-Qassas, Reda Abdu Yousef; Omar, Ali Elsayed Ali; Al‑Saleh, Ahmad Mohammad; Andráš, Peter; Eldosouky, Ahmed MohammedLately, Saudi Arabia has been developing its mineral exploration. However, comprehensive studies of the collected data are not accessible. Thus, the purpose of this research is to identify and map the hydrothermal alteration zones and structural lineaments that regulate the mineral occurrences in the Nuqrah region of the Kingdom of Saudi Arabia using remote sensing and aeromagnetic data. To achieve the desired goal of the study, ASTER remote sensing data were employed, and they were processed in several ways, including principal component analysis, band ratio, and false color composites to reveal the zones of alteration and structure lineaments. In addition, aeromagnetic data was employed to map the lineaments controlling the mineralization. These datasets were integrated using GIS tools to generate a new mineralization potential map of the Nuqrah area, which was classified into three classes: low, moderate, and high probability mineralization. The results showed thirteen intriguing anomalies (high potential mineralization) dispersed over the research area to be prospected. Additionally, techniques such as residual, regional, first vertical derivative, and tilt derivative were utilized to detect the potential mineral-related geologic structures. The results were validated by plotting known mineralization sites on our maps. Six significant faulting trends have been found, according to the lineament map and rose diagrams from remote sensing: NE–SW, WNW–ESE, N–S, ENE–WSW, NNE–SSW, NW–SE, and E–W. The research region is most affected by the NW–SE, ENE–WSW, E–W, and N–S trends, which are organized in decreasing order of magnitude, according to the rose diagram of the aeromagnetic maps. The applied approach can be employed to map potential mineral deposits in Saudi Arabia and similar zones around the globe.Položka Soil contamination at the dump-field of abandoned Cu-deposit Libiola, Italy(North University of Baia Mare, 2026) Andráš, Peter; Midula, Pavol; Andráš, Peter Jr.; Ševčíková, Janka; Eldosouky, Ahmed Mohammed; Kmeťová, Jarmila; Masný, Matej; Drímal, Marek; Janštová, Jana; Tomaškin, Ján; Kharbish, SherifIn the past centuries significant and now closed Libiola copper deposit in Liguria (Northern Italy) can be considered one of the most important mining areas of the Apennine Peninsula. The environmental risk is caused by the character of the dump matter, whose average pH is 4.03 and whose shows a high proportion of sulphidic sulphur (in average 0.30 %) in comparison with sulphate sulphur (in average of 0.10 %), so it has still great potential to create acidity and release potentially to the country components (soil, water, atmosphere, and biota) potentially toxic elements. The average concentrations of these elements are: Fe 16.37 %, Cu 3.753, Ni 771, Pb 35, As 12, and Cd 1.5 mg·kg-1. To characterize the mineralogical composition of the dump matter was used X-ray diffraction analyses. The risk is increased by the absence of carbonates, which could neutralize the acidity. On the other hand, the soil colloids have negative surface charge which facilitates the sorption of metals released into the solution and thus cause their partial immobilization. This article also presents the potential distribution of main potentially toxic elements, processed as an interpolation model in GIS.Položka Spatial analysis of leachate penetration at Lemna dumpsite, Calabar: Implications for sustainable waste management in Cross River State(Elsevier B.V. : Amsterdam, 2024) Igelle, Evaristus Idaga; Phil-Eze, Philip Ogbonnia; Akim, O. Okang; Kanu, H. Izuakolam; Ekwok, I. C.; Atsa, Joy William Undie; Ojugbo, P. A.; Okputu, Joseph S.; Abdelrahman, Kamal; Ekwok, Stephen Eguba; Andráš, Peter; Eldosouky, Ahmed MohammedThis study rigorously investigated the spatial analysis of leachate penetration at Lemna dumpsite, located in Calabar, Cross River State, Nigeria. Purposeful soil sampling, performed at specific intervals (5 m, 25 m, and 50 m) along the Electrical Resistivity profile line within the dumpsite, was augmented by water sample collection from five boreholes near Lemna dumpsite. Utilizing Electrical Resistivity Tomography (ERT) and Vertical Electric Sounding (VES) survey techniques, resistivity data were systematically gathered to comprehensively analyze the Leachate Penetration in the Lemna dumpsite. Laboratory analysis of soil and borehole water quality focused on Benzene, Toluene, Ethylbenzene, and Xylene (BTEX), with paired sample t-tests applied for statistical scrutiny. Analyzing the ERT and VES data employed sophisticated techniques embedded in Resistivity Two Dimension Invasion software and Advanced Geosciences Incorporation Earth Imager software. Substantial disparities (p < 0.05) emerged in the paired sample t-tests for BTEX in soil compared to National Environmental Standard Regulation and Enforcement Agency (NESREA) limits. Similarly, BTEX in borehole water displayed significant differences (p < 0.05) when compared to World Health Organization (WHO) standards, raising alarming concerns about the safety and portability of groundwater in the area. The examination of dumpsite leachate penetration revealed a resistivity anomaly of 8.01 Ωm and an inverse depth of 12.4 m, underscoring profound environmental implications and necessitating immediate remediation efforts. Additionally, Vulnerability and Aquifer Protective Capacity Index (VES) results, with a rating of <0.1, indicated severely compromised aquifer protective capacity, emphasizing the vulnerability of groundwater resources to further contamination. Our study advocates for strategic management, remediation, and monitoring measures to prevent contamination and safeguard water quality in the region.Položka Synergizing remote sensing, support vector machine, and aeromagnetic data for precise lithological and mineral potential mapping: a case study from Egypt(Taylor & Francis Group : Abingdon, 2026) El-Desoky, Hatem M.; Abdel-Rahman, Ahmed M.; El-Awny, Hamada; Fahmy, Wael; El-Qassas, Reda Abdu Yousef; Abdelrahman, Kamal; Alzahrani, Hassan; Andráš, Peter; Amer, Yahia Z.; Eldosouky, Ahmed MohammedPrecise lithological mapping is not only a strong key for exploring new mineralized areas but also could help in achieving the optimal exploitation of mineralized regions. In the present case, cause lithological mapping may provide advice not only to the distribution of possible placer deposit occurrences within the study region but also to small-scale blocks of gold-bearing rocks that are not specifically described in prior geological maps. Therefore, we effectively mapped the exposed rock units in the Hamash region of the Eastern Desert of Egypt by using Support Vector Machine (SVM) to Sentinel 2 data through executing machine learning algorithms (MLAs). This goal involves extensive fieldwork, petrographical examinations, and image processing remote sensing techniques to accurately reveal the exposed lithologies distribution besides the potential relic areas. Moreover, the results disclosed several occurrences of the gold-bearing rocks (e.g. alkali feldspar granites) within the study area besides highlighting the distribution of placer deposits that are mainly concentrated around the old mining workings. The lithological overall allocation accuracy (93.8%) was assessed through a confusion matrix, ground truth rock samples, and previous geological maps. Additionally, the airborne magnetic data were processed and interpreted to detect the main lineament structures controlling the favorable locations with high potential for gold mineralization and associated minerals. Also, the Center for Exploration Targeting (CET) porphyry map depicts the significant gold mineralization zones, which are regarded as targets for follow-up and ground studies. The current contribution greatly encourages further investigations for brownfields as their results could at least enhance a considered area of economic placer deposits, if not highlighting non-exploited lithological blocks.Položka Unveiling the mineral resources and structural patterns in the Middle Benue Trough: a comprehensive exploration using airborne magnetic and radiometric data(Taylor & Francis Group : Abingdon, 2024) Ekwok, Stephen Eguba; George, Anthony M.; Omori, Asuquo A.; Abdelrahman, Kamal; Ugar, Samuel Izama; Andráš, Peter; Morphy, Morod Iwong; Akpan, Anthony E.; Eldosouky, Ahmed MohammedThe Middle Benue Trough (MBT) in Northcentral Nigeria is a geologically significant area with vast mineral resource potential. Employing airborne magnetic and radiometric data, this study utilized the Centre for Exploration Targeting on enhanced total magnetic intensity data to reveal geologic structures, lithological units and mineralization zones. Lineaments predominantly trended in NE-SW direction, with noteworthy orientations in NNE-SSW and E-W. Radiometric anomalies correlated with distinct lithological units, pinpointing granitic gneiss, alluvium, shale, siltstone and sandstone. A magnetically concentrated and potassium-rich area indicated potential polymetallic-magnetic mineralization. The 2D model illustrated igneous intrusions influencing prevalent geologic structures, such as sediment baking and doming. Thorough analysis, including source parameter imaging, standard Euler deconvolution and 2D forward modelling, revealed sediment thicknesses below 1500 m. This research enhances understanding of the MBT’s geological features, offering valuable insights for mineral exploration and resource assessment in the region.