Integration of remote-sensing, structural, and geochemical data for characterizing granitoid rocks in Um Naggat pluton, Central Eastern Desert, Egypt

Al‐Arifi, Nassir; El-Din, Gamal Kamal; Abdelkareem, Mohamed; Abdalla, Fathy

doi:10.1007/s12517-020-06274-x

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…The recognition of surface alteration zones using remote sensing data along with detecting lineaments are significant factors in revealing the hydrothermal mineral resources [51]. Several methods have been successfully employed for this aim including PCA, band ratios, and spectral analysis [1,9,52].…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, applying bands 4, 5, and 6 in PCA revealed the areas of hydrothermal alteration. This is because the chosen PC2 indicates positive loading of band 4 (0.357) and a negative loading of bands 5 (−0.531) and 6 (−0.76), and reveals the existence of alunite and kaolinite minerals [52] (Figure 6e).…”

Section: Discussionmentioning

confidence: 99%

“…This is because combining several prospective layers using GIS-based fuzzy overlay maximized the optimum area of mineral prospectively (Figure 9a). The process of combining multi-criteria considers that each GIS-layer is an evidential map that has prospective and non-prospective pixels [1,2,52]. Therefore, the produced map successfully characterized the plausible areas of hydrothermal mineral resources into six prospective zones-excellent, very high, high, moderate, low, and very low (Figure 9a).…”

Section: Discussionmentioning

confidence: 99%

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Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Abdelkareem

Al‐Arifi

2021

Remote Sensing

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The Arabian Nubian Shield (ANS) contains a variety of gold deposits in the form of veins and veinlets formed by hydrothermal fluids. Characterizing potential areas of hydrothermal alteration zones therefore provides a significant tool for prospecting for hydrothermal gold deposits. In this study, we develop a model of exploration for hydrothermal mineral resources in an area located in the ANS, Egypt, using multiple criteria derived from Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Landsat-Operational Land Imager (OLI), and Sentinel-2 data and field work through GIS-based fuzzy logic approach. The hydrothermal alteration zones (HAZs) map extracted from combining mineral indices, spectral bands, and ratios is consistent with observed argillic alteration zones around the mineralized veins. Combining HAZs and lineament density led to identification of six zones based on their mineralization potential, and provides a tool for successful reconnaissance prospecting for future hydrothermal mineral deposits. The detected zones are labeled as excellent, very high, high, moderate, low, and very low, based on their potential for Au production, and the predictive excellent and very high zones cover about 1.6% of the study area. This model also shows that target prospective zones are quartz veins controlled by NNW-SSE trending fracture/fault zones all crosscutting Precambrian rocks of the ANS. Field observations and petrographic and X-ray diffraction analyses were performed to validate the mineral prospective map and revealed that quartz veins consist of gold–sulfide mineralization (e.g., gold, pyrite, chalcopyrite, and sphalerite). Consistency between the high potential hydrothermal alterations zones (HAZs) and the location of gold mineralization is achieved.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Abdelkareem

Al‐Arifi

2021

Remote Sensing

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“…Numerous studies have investigated rocks' physical and mechanical properties following thermal treatment. For instance, Arifi et al [14] observed that the mechanical properties of granite undergo significant alterations at elevated temperatures, often attributed to transformations in rock components and crystalline phases. In a similar context, Balme et al [15] conducted high-temperature experiments on three distinct varieties of basalts, uncovering intriguing findings.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cyclic Loading on Mode I Fracture Toughness of Granite under Real-Time High-Temperature Conditions

Lv,

Zhang,

Zhang

et al. 2024

Applied Sciences

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Under hot dry rock development, rock formations undergo the combined challenges of cyclic loading and high temperatures, stemming from various sources such as cyclic hydraulic fracturing and mechanical excavation. Therefore, a fundamental understanding of how rocks fracture under these demanding conditions is fundamental for cyclic hydraulic fracturing technology. To this end, a series of three-point bending tests were conducted on granite samples. These tests entailed exposing the samples to cyclic loading under varying real-time high-temperature environments, ranging from 25 °C to 400 °C. Furthermore, different upper load limits (75%, 80%, 85%, and 90% of the peak load) obtained in monotonic three-point bending tests were used to explore the behavior of granite under these conditions. The analysis encompassed the study of load–displacement curves, elastic stiffness, and mode I fracture toughness under cyclic loading conditions. In addition, the microscopic features of the fracture surface were examined using a scanning electron microscope (SEM). The findings revealed notable patterns in the behavior of granite. Cumulative vertical displacement in granite increased with the growing number of cycles, especially at 25 °C, 200 °C, and 300 °C. This displacement exhibited a unique trend, initially decreasing before subsequently rising as the cycle count increased. Additionally, the critical damage threshold of granite exhibited a gradual decline as the temperature rose. As the temperature ascended from 25 °C to 200 °C, the damage threshold typically ranged between 80% and 85% of the peak load. At 300 °C, this threshold declined to approximately 75–80% of the peak load, and at 400 °C, it fell below 75% of the peak load. Within the temperature ranging from 25 °C to 300 °C, we noted a significant increase in the incidence of cracks, crystal microfracture zones, and the dislodging of mineral particles within the granite as the number of cycles increased.

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Gold–sulfide mineralization in the Sir Bakis mine area, Central Eastern Desert, Egypt

Abdelkareem

El‐Shazly

2022

Int J Earth Sci (Geol Rundsch)

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Integration of remote-sensing, structural, and geochemical data for characterizing granitoid rocks in Um Naggat pluton, Central Eastern Desert, Egypt

Cited by 9 publications

References 52 publications

Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Synergy of Remote Sensing Data for Exploring Hydrothermal Mineral Resources Using GIS-Based Fuzzy Logic Approach

Effect of Cyclic Loading on Mode I Fracture Toughness of Granite under Real-Time High-Temperature Conditions

Gold–sulfide mineralization in the Sir Bakis mine area, Central Eastern Desert, Egypt

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