Unpaired ophiolite belts in the Neoproterozoic Allaqi-Heiani Suture, the Arabian-Nubian Shield: Evidences from magnetic data

Sehsah, Haytham; Eldosouky, Ahmed M.; Afandy, A. H. El

doi:10.1016/j.jafrearsci.2019.05.002

Cited by 33 publications

(10 citation statements)

References 49 publications

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“…The RTP map in Fig. 4a is upward-continued (UPC) 26 to an altitude of 8 km (4 km depth 3 , Fig. 4b).…”

Section: Potential Data Enhancement and Resultsmentioning

confidence: 99%

“…its interment depth, lateral extent and amplitude of the physical feature variation, is the ultimate intention of a potential (magnetic and gravity) field (PF) survey 1 . Recently, PF data have become prime tools in regional tectonic prospects [2][3][4] , petroleum exploration 5,6 and mineralization prospects [7][8][9][10] . Many techniques can be utilized in an automated mode to map the spatial distribution of physical parameters representing the sources in order to decipher the large scale structures.…”

Section: Large-scale Geological Structures Of the Egyptian Nubian Shieldmentioning

confidence: 99%

“…2 Geology Department, Faculty of Science, Suez University, Suez 43518, Egypt. 3 Geology Department, Faculty of Science, Tanta University, Tanta 31527, Egypt. * email: dr_a.eldosoky@yahoo.com; ahmed.eldosouky@sci.suezuni.edu.eg the previous structural provinces were regarded as tectonic hinges or megashears; Qena-Safaga Shear Zone between NED and CED, Idfu-Mersa Alam Shear Zone (Nugrus-Shait Shear Zone 16 between CED and SED).…”

Section: Large-scale Geological Structures Of the Egyptian Nubian Shieldmentioning

confidence: 99%

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Large-scale geological structures of the Egyptian Nubian Shield

Hamimi

Eldosouky

Hagag

et al. 2023

Sci Rep

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Integration of potential field- and structural data make it possible to trace surface and subsurface large-scale geological structures of the Egyptian Nubian Shield (ENS). Obtained results indicate that the Northern Eastern Desert (NED) of the ENS is dominated by relatively younger (c. 580 Ma) E–W and NE–SW trending extensional structures that were controlled by the evolution and retreat of the Cadomian Arc. Density of such extensional structures increases with depth as displayed by the potential data. The prevailing structural trends in the Central Eastern Desert (CED) are NW–SE and WNW–ESE. Both trends are highly prompted by the timing of deformation upon the Najd Fault System, and are themselves dissected by a relatively younger NE–SW shearing trend. Lineament density in the CED is subordinate for both subsurface and near surface structures. The South Eastern Desert exhibits compressional and extrusion-related structures of two main prominent trends; WNW-to-NW (to the western part) and the N-, NNE- to NE (to the eastern part). The previously mentioned Neoproterozoic trends are remarkably influenced by the Oligocene–Miocene Red Sea-Gulf of Suez rift related fractures in the vicinity of the rift shoulder. The remarkable change in trends and densities of structural trends, especially in the NED, is interpreted in terms of concealing of the older structures by the younger extensional structures which in turns reflect an N-ward progressive deformation in the entire ENS. Gravity data are more appropriate in delineating the structural trends compared to the magnetic data which are largely affected by lithological variations and/or alteration zones and magnetic mineralogy.

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“…The RTP map in Fig. 4a is upward-continued (UPC) 26 to an altitude of 8 km (4 km depth 3 , Fig. 4b).…”

Section: Potential Data Enhancement and Resultsmentioning

confidence: 99%

Section: Large-scale Geological Structures Of the Egyptian Nubian Shieldmentioning

confidence: 99%

Section: Large-scale Geological Structures Of the Egyptian Nubian Shieldmentioning

confidence: 99%

See 1 more Smart Citation

Large-scale geological structures of the Egyptian Nubian Shield

Hamimi

Eldosouky

Hagag

et al. 2023

Sci Rep

Self Cite

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“…Analysis and interpretation of aeromagnetic data allowed mapping the subsurface extension of geologic structures * Corresponding authors at: Suez University E-mail addresses: dr_a.eldosoky@yahoo.com (A.M. Eldosouky) (Abuelnaga et al, 2019;Eldosouky, 2019;Sehsah et al, 2019;Sehsah and Eldosouky, 2020;Eldosouky et al, 2020a,b,c;Pham et al, 2020cPham et al, , 2021aEldosouky & Mohamed, 2021) and revealing porphyry intrusion (Gaafar, 2015;Holden et al, 2011;Wemegah et al, 2015;Eldosouky et al, 2020d). Aeromagnetic surveys play an essential role in searching for mineral deposits attributed to intrusions structures and shear zones.…”

Section: Introductionmentioning

confidence: 99%

Utilization of Landsat-8 Imagery and Aeromagnetic Data for Deciphering Alteration Zones and Structures: Implications for Mineral Exploration in the Southeastern Desert of Egypt

Eldosouky

Pour

Hamed

et al. 2021

Frontiers in Scientific Research and Technology

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Remote-sensing (RS) and aeromagnetic data implemented notable information for mineralization potentiality detection of ore deposits within Al-Allaqi region of the southeastern Desert of Egypt. Several approaches of remote-sensing and aeromagnetic data were implemented. Results of band ratios (BR) and Principal Component Analysis (PCA) practicing Landsat-8 successfully imaged the hydrothermally altered zones and the structures outlined by lithologic contacts, faults, and porphyry features (dyke-like structures). Lineaments well extracted using aeromagnetic datasets. CET system method was applied for generating a heat map of the structural complexity. Likewise, the CET Porphyry Analysis system was performed to extract the likely near-circular porphyry features that revealing a probable site of mineralization and to validate the remote sensing observations. Integrated outcomes showed that areas of highly complex structures, density (fractures/faults) are consistent with the detected hydrothermally altered areas that are rivaled with mining zones in Al-Allaqi region of the Southeastern Desert of Egypt. This approach can be broadly appropriate to other divisions of the Southeastern Desert of Egypt for mineral prospecting.

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“…There are many methods for enhancing the lateral location of the structures, most of which are based on the horizontal and vertical gradients of the gravity anomaly [24][25][26][27][28][29][30]. Recently, applications of enhancement techniques to potential field data have shown great success [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Some authors have developed the different techniques based on the amplitudes of the gradients of the field to detect the edges related to a known gravity anomaly [46][47][48][49].…”

Section: Introductionmentioning

confidence: 99%

The utility of the enhancement techniques for mapping subsurface structures from gravity data

Pham¹,

Xuan²,

Eldosouky³

et al. 2021

Frontiers in Scientific Research and Technology

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An important feature in the interpretation of gravity data is the determination of the edges of the density structures. There are several different enhancement techniques used to achieve the edge locations. In this study, we aim to estimate the effectiveness of some edge enhancement techniques such as the total horizontal gradient, analytic signal, theta map, and logistic function of the total horizontal gradient in terms of their accuracy on detection of subsurface structures from gravity data. These methods were tested on synthetic gravity data with and without noise. Findings show that the logistic function of the total horizontal gradient performs better than other methods under almost all cases. Additionally, the methods are also applied to real gravity data from the Phu Khanh basin as a practical example. The results determined by the LTHG technique reveals the presence of many structures with E-W, NE-SW, NNW-SSE, ENE-WSW, and NNE-SSW trends in the basin.

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Unpaired ophiolite belts in the Neoproterozoic Allaqi-Heiani Suture, the Arabian-Nubian Shield: Evidences from magnetic data

Cited by 33 publications

References 49 publications

Large-scale geological structures of the Egyptian Nubian Shield

Large-scale geological structures of the Egyptian Nubian Shield

Utilization of Landsat-8 Imagery and Aeromagnetic Data for Deciphering Alteration Zones and Structures: Implications for Mineral Exploration in the Southeastern Desert of Egypt

The utility of the enhancement techniques for mapping subsurface structures from gravity data

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