Árpád Csámer | University of Debrecen (original) (raw)

Papers by Árpád Csámer

Ore geology reviews, May 1, 2024

Detailed geological mapping is the decisive key for mineral deposit prospecting, deciphering tect... more Detailed geological mapping is the decisive key for mineral deposit prospecting, deciphering tectonic models, and outlining the main framework for most development programs and constructions. Without a doubt, various remote sensing datasets have introduced reliable lithological and structural mapping solutions. The main defect with remote sensing data is the curse of dimensionality, especially with hyperspectral data, where a lot of time is spent handling and selecting representative bands for various geological analyses. Consequently, and for the first time, our research is an attempt to resolve the complicated structural patterns (lineaments, folds, foliations, and cross-cutting relationships) and enhance lithological discrimination using a single band (of Sentinel 2 and ALOS PRISM data) and textural analysis. Through several trials over different pixel sizes (2.5 m and 10 m) and various kernels (3 × 3, 7 × 7, or 11 × 11), reasonable results are obtained, enabling lithological discrimination, in-depth structural analysis (foliations, faults, joints, and folds), shape recognition of systematic rock bodies, and delineation of quaternary deposits using single band analysis rather than time-consuming multiple band processing. Our results have been verified using intensive fieldwork and accurate visual interpretations using different datasets (e.g., previous geological maps, remote sensing data, etc.). Upon field verification and petrographical investigations of this research outcomes, we strongly recommend the adopted approach for the geological community, as it opens the doors for various applications utilizing single-band second-order statistics. We expect that this research could significantly help the geological community by reviving several previous studies and being applicable for future research, besides offering a reasonable approach for minimizing the time and efforts required for detailed field studies by highlighting micro-and mesoscale structures.

Lunar and Planetary Science Conference, Mar 1, 2019

Environmental Earth Sciences, Aug 16, 2021

Environmental geological survey of a chemical works situated in NE Hungary has been performed for... more Environmental geological survey of a chemical works situated in NE Hungary has been performed for decades. Up till now, several hundreds of drillings of different depths as well as engineering geological soundings have been carried out in the area. Vivianite has been found in a discrete part of a drilling in a gray, silty bed at the depth 6.8-8.5 m. Vivianite was analyzed using X-ray powder diffraction (XRPD), thermal analysis (TG/DTG), and scanning electron microscopic and energy dispersive spectrometry (SEM-EDS) techniques. To demonstrate the spatial distribution of hydrochemical parameters and selected chemical constituents the available data concerning drillings and hydrochemical analyses were collected and evaluated, and field measurements were also performed. For mapping the distribution of relevant physico-chemical parameters and chemical constituents kriging interpolation method was used. Archive aerial photographs demonstrate that a coffered, earth-bedded reservoir for storing huge amounts of extracted plant debris is situated in the vicinity of the drilling. Our study suggests that orthophosphate derived from decomposing biomass entered the groundwater and accumulated within the lowest permeability zone of the intact bedrock. Therefore, the discrete appearance of vivianite in the drilling can be regarded, at least partly, the result of a man-induced mineralogical process.

Scientific Reports

Integrating diverse techniques and datasets, significantly enhances the accurate identification o... more Integrating diverse techniques and datasets, significantly enhances the accurate identification of various mineral deposits. This work aims to determine different types of mineral deposits in the Hamash district (Southern Eastern Desert, Egypt) by combining structural features (derived from ALOS PALSAR DEM), alteration zones (detected using ASTER and Sentinel-2), and ore mineralogy. Multispectral imaging, such as ASTER and Sentinel-2 satellite data, provides a cost-effective and efficient tool for lithological and hydrothermal alteration mapping utilizing selective band ratios (SBR), directed principal component analysis (DPCA), feature-oriented false-color composites (FFCC), and constrained energy minimization (CEM). The deductions drawn from the analysis of ASTER and Sentinel 2 satellite data are solidly corroborated through meticulous investigations of pre-existing lithological maps in the study area, on-site validation via fieldwork, and robust laboratory analysis, attesting to ...

Minerals

Fused remote sensing datasets have greatly contributed to enhancing lithological targets and prov... more 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 min...

Scientific Reports

Integrating various tools in targeting mineral deposits increases the chance of adequate detectio... more Integrating various tools in targeting mineral deposits increases the chance of adequate detection and characterization of mineralization zones. Selecting a convenient dataset is a key for a precise geological and hydrothermal alteration mapping. Remote sensing and airborne geophysical data have proven their efficiency as tools for reliable mineral exploration. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Advanced land imager (ALI), Landsat 8 (L8), and Sentinel 2 data are widely-used data among various types of remote sensing images in resolving lithological and hydrothermal alteration mapping over the last two decades. ASTER is a well-established satellite in geological remote sensing with detailed Short-wave infrared (SWIR) range compared to visible and near-infrared region (VNIR) that controls iron-associated alteration detection. On contrary, ALI has excellent coverage of the VNIR area (6 bands), but does not possess the potentiality of ASTER for the S...

The Egyptian Journal of Remote Sensing and Space Science

The Kaba fell on 15th of April 1857, at the vicinity of Kaba village, in Bihar county, Hungary. K... more The Kaba fell on 15th of April 1857, at the vicinity of Kaba village, in Bihar county, Hungary. Kaba, which is the least metamorphosed meteorite, belongs to the oxidized subgroup of the CV3 carbonaceous chondrite class (McSween 1977, Peck 1984, Bonal et al. 2006, Rubin 2012). The first chemical analysis of the meteorite was performed by a German chemist Friedrich Wöhler, in 1858 (Wöhler 1858, 1859). The first modern geological study was done by Sztrókay et al. in 1961 (Sztrókay et al. 1961). He and his co-authors obtained the mineral composition and the major and minor element concentrations of the bulk. Since then more than hundred scientific papers dealt with the mineralogical, physical and chemical properties of the meteorite, including the compositional analysis of the bulk or certain components (chondrules, CAIs, matrix), and if we consider the number of scientific papers published in the last ten years in this topic, we can conclude that the scientific interest has not decreased yet. The aim of this presentation is to confirm the results of previous chemical analysis based on the analysis of a new sample obtained from Kaba, furthermore to perform trace elemental analysis of the studied sample using highly sensitive analytical techniques. A black, irregular chip of 0.1197 g showing no visible internal structure was used for the digestion. The sample was gradually dissolved in different acid mixtures for subsequent atomic spectrometric studies. M1 solution: the sample was dissolved in 2 ml concentrated analytical grade nitric acid. M2 solution: the solid residue was further dissolved in aqua regia and 0.5 ml concentrated hydrogen fluoride. M3 solution: the residue was further digested in a closed Teflon vessel with the aid of microwave digestion, in the presence of 2 ml concentrated hydrochloric acid, 1 ml concentrated nitric acid and 0.5 ml 40 percent hydrogen fluoride using microwave digestion system (Milestone Ethos Up microwave digestion system equipped with SK15 rotor). Finally, the remaining sample had been almost completely dissolved, except the 2 mass percent reside that is supposed to be carbon powder. During the analysis analyte-free blank samples (reagent blank) also have been prepared and measured. The result values obtained during analyses of the samples were corrected by the average values of the reagent blanks. The major components of the meteorite were measured using Thermo Scientific iCAP 6300 Dual view inductively coupled plasma optical emission spectrometer (ICP-OES). Trace element analysis was carried out using a high sensitivity Thermo Scientific X-Series II inductively coupled plasma mass spectrometer (ICP-MS). After the treatment with concentrated nitric acid, 42 mass percent of the sample had been dissolved (M1 fraction). Other 45 mass percent were dissolved after the subsequent treatment with the mixture of nitric acid, hydrochloric acid and hydrogen fluoride under atmospheric pressure (M2 fraction), the remaining part was digested in the same mixture of nitric acid, hydrochloric acid and hydrogen fluoride by microwave assisted digestion in a closed vessel (M3 fraction). Following the concentrated nitric acid treatment all sulfides, some oxide minerals and probably a part of the glass had been dissolved. Larger part of REEs also were connected to these mineral phases. Silicon was leached into M2 samples only, when the silicates and the remnant glass were in soluble fluoro-silicate complex form. The elements determined in the sample M2, probably were connected to the silicate minerals and/or glass. The presence of major elements (e.g. Al, Mg, Fe) in the M3 fraction supports the occurrence of Mg-Al and Fe-Al mixed oxides (spinel group) (sample M3). The major elements of the meteorite sample are in the concentration range between 1 and 30 mass percent. Some other elements, such as Na, Cr, Mn, K, Ti, Co and Zn are presented in the concentration range of tenth or hundredth mass percent. Further 37 elements can be found in ppm or ppb range, and 10 of the studied elements are below the limit of detection of the applied instrumental techniques. Though the results show quite diverse chemical composition, the concentrations of the major elements show good agreement with the elemental constituents of main mineral phases determined by Sztrókay et al. (1961). Good correspondence can be observed between the literature and the new results in the

IOP Conference Series: Earth and Environmental Science, 2021

Remote sensing datasets have introduced remarkable advancements in mapping rock units, structural... more Remote sensing datasets have introduced remarkable advancements in mapping rock units, structural elements, and hydrothermal alteration zones. This study applied Landsat Operational Land Imager (OLI) multispectral dataset in discriminating the intricate basement of Um Salim area, Central Eastern Desert (CED), Egypt. Moreover, a panchromatic 15m pixel size band is implemented to extract the study area’s linear structural features. Several image processing methods including False Color Combination (FCC), Band Ratio (BR), Optimum Index Factor (OIF), and Density slicing were utilized in lithological and alteration mapping. The widely used, LINE module of the PCI Geomatica is applied for lineament extraction. Results reasonably discriminate the complicated rock units using selected composites depending on OIF results. A photo-geological map is constructed and shows greater coincidence with recently published maps. Lineaments map and its density revealed the preponderance of NE-SW and WNW...

International Journal of Applied Earth Observation and Geoinformation, 2021

The Egyptian Journal of Remote Sensing and Space Science

Groundwater demand has dramatically increased due to the swift demographic explosion, especially ... more Groundwater demand has dramatically increased due to the swift demographic explosion, especially in arid areas, where groundwater is considered the main source for all purposes. Thus, this research integrates climatological, lithological, structural, topographical, hydro-morphological, and geoelectrical data to explore groundwater potential zones in the central part of Sinai Peninsula, Egypt using the GIS-based Analytic Hierarchy Process (AHP). Seven thematic layers of soil moisture, rainfall, normalized difference vegetation index, drainage density, lineament density, slope, and land use/land cover were built from different remote sensing data sets. The eighth layer represents a high-resolution lithological map of the study area, constructed utilizing the power of the support vector machine over Sentinel 2 data and accurately assessed with a previously published geological map. Ground Water Potentiality Map (GWPM) was constructed and highlighted four main areas as promising zones. Comprehensive geoelectrical analysis was executed through seventeen deep vertical electrical soundings (VESs) using Schlumberger configuration, isoresistivity mapping, and geoelectric cross-sections along five different profiles. 3D view of the studied area’s subsurface geological and structural pattern with groundwater flow direction specification, and adequate aquifer characterization, revealed four main geoelectrical units. Geoelectrical data results reasonably coincided with remote sensing data findings in highlighting three freshwater potential zones. Furthermore, the study strongly recommends integrating low-cost remote sensing datasets in narrowing the zone to be intensively investigated using further costly geophysical approaches or drilling test boreholes.

Minerals, 2021

In this research, airborne geophysical and remote sensing datasets were integrated for gold poten... more In this research, airborne geophysical and remote sensing datasets were integrated for gold potentiality mapping (GPM) over the Atalla area in Central Eastern Desert, Egypt. Utilizing aeromagnetic data, detailed structural complexity maps were constructed using the center for exploration targeting (CET) procedure. Then, spectrometric gamma-ray data primarily located hydrothermally altered tracts with discriminating various rock units. The latter are precisely outlined by implementing various techniques (false-color composite (FCC), band ratio (BR), relative absorption band depth (RBD), directed principal component analysis (DPCA), and constrained energy minimization (CEM)) to ASTER, Sentinel 2 and ALOS PRISM datasets, with reference to the geological maps. The study exhibits that gold mineralization is structurally controlled by NW-SE direction. The findings of structural complexity and hydrothermal alteration (argillic, advanced argillic, phyllic, and propylitic) were used as weigh...

Arabian Journal of Geosciences

Different types of remote sensing data are commonly used as inputs for lithological classificatio... more Different types of remote sensing data are commonly used as inputs for lithological classification schemes, yet determining the best data source for each specific application is still unresolved, but critical for the best interpretations. In addition, various classifiers (i.e., artificial neural network (ANN), maximum likelihood classification (MLC), and support vector machine (SVM)) have proven their variable efficiencies in lithological mapping, yet determining which technique is preeminent is still questionable. Consequently, this study aims to test the potency of Earth observing-1 Advanced Land Imager (ALI) data with the frequently utilized Sentinel 2 (S2), ASTER, and Landsat OLI (L8) data in lithological allocation using the widely accepted ANN, MLC, and SVM, for a case study in the Um Salatit area, in the Eastern Desert of Egypt. This area has a recent geological map that is used as a reference for selecting training and testing samples required for machine learning algorithms...

These works make it clear that phenomena of magma/wet sediment interactions are common in geologi... more These works make it clear that phenomena of magma/wet sediment interactions are common in geological environments where thick sediment sequences accumulate during active volcanism. Miocene palaeogeographic environment (HÁMOR, 2001) and neutral volcanism of the East Borsod Basin allowed the formation of different types of these rocks.

Ore geology reviews, May 1, 2024

Detailed geological mapping is the decisive key for mineral deposit prospecting, deciphering tect... more Detailed geological mapping is the decisive key for mineral deposit prospecting, deciphering tectonic models, and outlining the main framework for most development programs and constructions. Without a doubt, various remote sensing datasets have introduced reliable lithological and structural mapping solutions. The main defect with remote sensing data is the curse of dimensionality, especially with hyperspectral data, where a lot of time is spent handling and selecting representative bands for various geological analyses. Consequently, and for the first time, our research is an attempt to resolve the complicated structural patterns (lineaments, folds, foliations, and cross-cutting relationships) and enhance lithological discrimination using a single band (of Sentinel 2 and ALOS PRISM data) and textural analysis. Through several trials over different pixel sizes (2.5 m and 10 m) and various kernels (3 × 3, 7 × 7, or 11 × 11), reasonable results are obtained, enabling lithological discrimination, in-depth structural analysis (foliations, faults, joints, and folds), shape recognition of systematic rock bodies, and delineation of quaternary deposits using single band analysis rather than time-consuming multiple band processing. Our results have been verified using intensive fieldwork and accurate visual interpretations using different datasets (e.g., previous geological maps, remote sensing data, etc.). Upon field verification and petrographical investigations of this research outcomes, we strongly recommend the adopted approach for the geological community, as it opens the doors for various applications utilizing single-band second-order statistics. We expect that this research could significantly help the geological community by reviving several previous studies and being applicable for future research, besides offering a reasonable approach for minimizing the time and efforts required for detailed field studies by highlighting micro-and mesoscale structures.

Lunar and Planetary Science Conference, Mar 1, 2019

Environmental Earth Sciences, Aug 16, 2021

Environmental geological survey of a chemical works situated in NE Hungary has been performed for... more Environmental geological survey of a chemical works situated in NE Hungary has been performed for decades. Up till now, several hundreds of drillings of different depths as well as engineering geological soundings have been carried out in the area. Vivianite has been found in a discrete part of a drilling in a gray, silty bed at the depth 6.8-8.5 m. Vivianite was analyzed using X-ray powder diffraction (XRPD), thermal analysis (TG/DTG), and scanning electron microscopic and energy dispersive spectrometry (SEM-EDS) techniques. To demonstrate the spatial distribution of hydrochemical parameters and selected chemical constituents the available data concerning drillings and hydrochemical analyses were collected and evaluated, and field measurements were also performed. For mapping the distribution of relevant physico-chemical parameters and chemical constituents kriging interpolation method was used. Archive aerial photographs demonstrate that a coffered, earth-bedded reservoir for storing huge amounts of extracted plant debris is situated in the vicinity of the drilling. Our study suggests that orthophosphate derived from decomposing biomass entered the groundwater and accumulated within the lowest permeability zone of the intact bedrock. Therefore, the discrete appearance of vivianite in the drilling can be regarded, at least partly, the result of a man-induced mineralogical process.

Scientific Reports

Integrating diverse techniques and datasets, significantly enhances the accurate identification o... more Integrating diverse techniques and datasets, significantly enhances the accurate identification of various mineral deposits. This work aims to determine different types of mineral deposits in the Hamash district (Southern Eastern Desert, Egypt) by combining structural features (derived from ALOS PALSAR DEM), alteration zones (detected using ASTER and Sentinel-2), and ore mineralogy. Multispectral imaging, such as ASTER and Sentinel-2 satellite data, provides a cost-effective and efficient tool for lithological and hydrothermal alteration mapping utilizing selective band ratios (SBR), directed principal component analysis (DPCA), feature-oriented false-color composites (FFCC), and constrained energy minimization (CEM). The deductions drawn from the analysis of ASTER and Sentinel 2 satellite data are solidly corroborated through meticulous investigations of pre-existing lithological maps in the study area, on-site validation via fieldwork, and robust laboratory analysis, attesting to ...

Minerals

Fused remote sensing datasets have greatly contributed to enhancing lithological targets and prov... more 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 min...

Scientific Reports

Integrating various tools in targeting mineral deposits increases the chance of adequate detectio... more Integrating various tools in targeting mineral deposits increases the chance of adequate detection and characterization of mineralization zones. Selecting a convenient dataset is a key for a precise geological and hydrothermal alteration mapping. Remote sensing and airborne geophysical data have proven their efficiency as tools for reliable mineral exploration. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Advanced land imager (ALI), Landsat 8 (L8), and Sentinel 2 data are widely-used data among various types of remote sensing images in resolving lithological and hydrothermal alteration mapping over the last two decades. ASTER is a well-established satellite in geological remote sensing with detailed Short-wave infrared (SWIR) range compared to visible and near-infrared region (VNIR) that controls iron-associated alteration detection. On contrary, ALI has excellent coverage of the VNIR area (6 bands), but does not possess the potentiality of ASTER for the S...

The Egyptian Journal of Remote Sensing and Space Science

The Kaba fell on 15th of April 1857, at the vicinity of Kaba village, in Bihar county, Hungary. K... more The Kaba fell on 15th of April 1857, at the vicinity of Kaba village, in Bihar county, Hungary. Kaba, which is the least metamorphosed meteorite, belongs to the oxidized subgroup of the CV3 carbonaceous chondrite class (McSween 1977, Peck 1984, Bonal et al. 2006, Rubin 2012). The first chemical analysis of the meteorite was performed by a German chemist Friedrich Wöhler, in 1858 (Wöhler 1858, 1859). The first modern geological study was done by Sztrókay et al. in 1961 (Sztrókay et al. 1961). He and his co-authors obtained the mineral composition and the major and minor element concentrations of the bulk. Since then more than hundred scientific papers dealt with the mineralogical, physical and chemical properties of the meteorite, including the compositional analysis of the bulk or certain components (chondrules, CAIs, matrix), and if we consider the number of scientific papers published in the last ten years in this topic, we can conclude that the scientific interest has not decreased yet. The aim of this presentation is to confirm the results of previous chemical analysis based on the analysis of a new sample obtained from Kaba, furthermore to perform trace elemental analysis of the studied sample using highly sensitive analytical techniques. A black, irregular chip of 0.1197 g showing no visible internal structure was used for the digestion. The sample was gradually dissolved in different acid mixtures for subsequent atomic spectrometric studies. M1 solution: the sample was dissolved in 2 ml concentrated analytical grade nitric acid. M2 solution: the solid residue was further dissolved in aqua regia and 0.5 ml concentrated hydrogen fluoride. M3 solution: the residue was further digested in a closed Teflon vessel with the aid of microwave digestion, in the presence of 2 ml concentrated hydrochloric acid, 1 ml concentrated nitric acid and 0.5 ml 40 percent hydrogen fluoride using microwave digestion system (Milestone Ethos Up microwave digestion system equipped with SK15 rotor). Finally, the remaining sample had been almost completely dissolved, except the 2 mass percent reside that is supposed to be carbon powder. During the analysis analyte-free blank samples (reagent blank) also have been prepared and measured. The result values obtained during analyses of the samples were corrected by the average values of the reagent blanks. The major components of the meteorite were measured using Thermo Scientific iCAP 6300 Dual view inductively coupled plasma optical emission spectrometer (ICP-OES). Trace element analysis was carried out using a high sensitivity Thermo Scientific X-Series II inductively coupled plasma mass spectrometer (ICP-MS). After the treatment with concentrated nitric acid, 42 mass percent of the sample had been dissolved (M1 fraction). Other 45 mass percent were dissolved after the subsequent treatment with the mixture of nitric acid, hydrochloric acid and hydrogen fluoride under atmospheric pressure (M2 fraction), the remaining part was digested in the same mixture of nitric acid, hydrochloric acid and hydrogen fluoride by microwave assisted digestion in a closed vessel (M3 fraction). Following the concentrated nitric acid treatment all sulfides, some oxide minerals and probably a part of the glass had been dissolved. Larger part of REEs also were connected to these mineral phases. Silicon was leached into M2 samples only, when the silicates and the remnant glass were in soluble fluoro-silicate complex form. The elements determined in the sample M2, probably were connected to the silicate minerals and/or glass. The presence of major elements (e.g. Al, Mg, Fe) in the M3 fraction supports the occurrence of Mg-Al and Fe-Al mixed oxides (spinel group) (sample M3). The major elements of the meteorite sample are in the concentration range between 1 and 30 mass percent. Some other elements, such as Na, Cr, Mn, K, Ti, Co and Zn are presented in the concentration range of tenth or hundredth mass percent. Further 37 elements can be found in ppm or ppb range, and 10 of the studied elements are below the limit of detection of the applied instrumental techniques. Though the results show quite diverse chemical composition, the concentrations of the major elements show good agreement with the elemental constituents of main mineral phases determined by Sztrókay et al. (1961). Good correspondence can be observed between the literature and the new results in the

IOP Conference Series: Earth and Environmental Science, 2021

Remote sensing datasets have introduced remarkable advancements in mapping rock units, structural... more Remote sensing datasets have introduced remarkable advancements in mapping rock units, structural elements, and hydrothermal alteration zones. This study applied Landsat Operational Land Imager (OLI) multispectral dataset in discriminating the intricate basement of Um Salim area, Central Eastern Desert (CED), Egypt. Moreover, a panchromatic 15m pixel size band is implemented to extract the study area’s linear structural features. Several image processing methods including False Color Combination (FCC), Band Ratio (BR), Optimum Index Factor (OIF), and Density slicing were utilized in lithological and alteration mapping. The widely used, LINE module of the PCI Geomatica is applied for lineament extraction. Results reasonably discriminate the complicated rock units using selected composites depending on OIF results. A photo-geological map is constructed and shows greater coincidence with recently published maps. Lineaments map and its density revealed the preponderance of NE-SW and WNW...

International Journal of Applied Earth Observation and Geoinformation, 2021

The Egyptian Journal of Remote Sensing and Space Science

Groundwater demand has dramatically increased due to the swift demographic explosion, especially ... more Groundwater demand has dramatically increased due to the swift demographic explosion, especially in arid areas, where groundwater is considered the main source for all purposes. Thus, this research integrates climatological, lithological, structural, topographical, hydro-morphological, and geoelectrical data to explore groundwater potential zones in the central part of Sinai Peninsula, Egypt using the GIS-based Analytic Hierarchy Process (AHP). Seven thematic layers of soil moisture, rainfall, normalized difference vegetation index, drainage density, lineament density, slope, and land use/land cover were built from different remote sensing data sets. The eighth layer represents a high-resolution lithological map of the study area, constructed utilizing the power of the support vector machine over Sentinel 2 data and accurately assessed with a previously published geological map. Ground Water Potentiality Map (GWPM) was constructed and highlighted four main areas as promising zones. Comprehensive geoelectrical analysis was executed through seventeen deep vertical electrical soundings (VESs) using Schlumberger configuration, isoresistivity mapping, and geoelectric cross-sections along five different profiles. 3D view of the studied area’s subsurface geological and structural pattern with groundwater flow direction specification, and adequate aquifer characterization, revealed four main geoelectrical units. Geoelectrical data results reasonably coincided with remote sensing data findings in highlighting three freshwater potential zones. Furthermore, the study strongly recommends integrating low-cost remote sensing datasets in narrowing the zone to be intensively investigated using further costly geophysical approaches or drilling test boreholes.

Minerals, 2021

In this research, airborne geophysical and remote sensing datasets were integrated for gold poten... more In this research, airborne geophysical and remote sensing datasets were integrated for gold potentiality mapping (GPM) over the Atalla area in Central Eastern Desert, Egypt. Utilizing aeromagnetic data, detailed structural complexity maps were constructed using the center for exploration targeting (CET) procedure. Then, spectrometric gamma-ray data primarily located hydrothermally altered tracts with discriminating various rock units. The latter are precisely outlined by implementing various techniques (false-color composite (FCC), band ratio (BR), relative absorption band depth (RBD), directed principal component analysis (DPCA), and constrained energy minimization (CEM)) to ASTER, Sentinel 2 and ALOS PRISM datasets, with reference to the geological maps. The study exhibits that gold mineralization is structurally controlled by NW-SE direction. The findings of structural complexity and hydrothermal alteration (argillic, advanced argillic, phyllic, and propylitic) were used as weigh...

Arabian Journal of Geosciences

Different types of remote sensing data are commonly used as inputs for lithological classificatio... more Different types of remote sensing data are commonly used as inputs for lithological classification schemes, yet determining the best data source for each specific application is still unresolved, but critical for the best interpretations. In addition, various classifiers (i.e., artificial neural network (ANN), maximum likelihood classification (MLC), and support vector machine (SVM)) have proven their variable efficiencies in lithological mapping, yet determining which technique is preeminent is still questionable. Consequently, this study aims to test the potency of Earth observing-1 Advanced Land Imager (ALI) data with the frequently utilized Sentinel 2 (S2), ASTER, and Landsat OLI (L8) data in lithological allocation using the widely accepted ANN, MLC, and SVM, for a case study in the Um Salatit area, in the Eastern Desert of Egypt. This area has a recent geological map that is used as a reference for selecting training and testing samples required for machine learning algorithms...

These works make it clear that phenomena of magma/wet sediment interactions are common in geologi... more These works make it clear that phenomena of magma/wet sediment interactions are common in geological environments where thick sediment sequences accumulate during active volcanism. Miocene palaeogeographic environment (HÁMOR, 2001) and neutral volcanism of the East Borsod Basin allowed the formation of different types of these rocks.