Geology, structure, geochemistry and ASTER-based mapping of Neoproterozoic Gebel El-Delihimmi granites, Central Eastern Desert of Egypt

Asran, Asran Mohamed; Emam, Ashraf; El-Fakharani, Abdelhamid

doi:10.1016/j.lithos.2017.03.022

Cited by 24 publications

(6 citation statements)

References 47 publications

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“…Methods applied for rigorous analysis of the SWIR data include band-rationing (BR), principal component analysis (PCA), independent component analysis (ICA), and the relative absorption band depth (RBD). Ninomiya's mineralogical indices were also used to effectively help in lithological and hydrothermal alteration mapping, integrated with fieldwork data (Figure 3) [22][23][24][25][26][27][28][29][30][31]. Adaptive filtering, band math, PCA, and directional filtering were applied to PALSAR and Sentinel-1 data for lineament extraction by manual and automated means.…”

Section: Data Characteristics and Methodsmentioning

confidence: 99%

Multispectral and Radar Data for the Setting of Gold Mineralization in the South Eastern Desert, Egypt

et al. 2019

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Satellite-based multi-sensor data coupled with field and microscopic investigations are used to unravel the setting and controls of gold mineralization in the Wadi Beitan–Wadi Rahaba area in the South Eastern Desert of Egypt. The satellite-based multispectral and Synthetic Aperture Radar (SAR) data promoted a vibrant litho-tectonic understanding and abetted in assessing the regional structural control of the scattered gold occurrences in the study area. The herein detailed approach includes band rationing, principal component and independent component analyses, directional filtering, and automated and semi-automated lineament extraction techniques to Landsat 8- Operational Land Imager (OLI), Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), Phased Array L-band Synthetic Aperture Radar (PALSAR), and Sentinel-1B data. Results of optical and SAR data processed as grayscale raster images of band ratios, Relative Absorption Band Depth (RBD), and (mafic–carbonate–hydrous) mineralogical indices are used to extract the representative pixels (regions of interest). The extracted pixels are then converted to vector shape files and are finally imported into the ArcMap environment. Similarly, manually and automatically extracted lineaments are merged with the band ratios and mineralogical indices vector layers. The data fusion approach used herein reveals no particular spatial association between gold occurrences and certain lithological units, but shows a preferential distribution of gold–quartz veins in zones of chlorite–epidote alteration overlapping with high-density intersections of lineaments. Structural features including en-echelon arrays of quartz veins and intense recrystallization and sub-grain development textures are consistent with vein formation and gold deposition syn-kinematic with the host shear zones. The mineralized, central-shear quartz veins, and the associated strong stretching lineation affirm vein formation amid stress build-up and stress relaxation of an enduring oblique convergence (assigned as Najd-related sinistral transpression; ~640–610 Ma). As the main outcome of this research, we present a priority map with zones defined as high potential targets for undiscovered gold resources.

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Section: Data Characteristics and Methodsmentioning

confidence: 99%

Multispectral and Radar Data for the Setting of Gold Mineralization in the South Eastern Desert, Egypt

et al. 2019

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“…In ED in Egypt, several studies have shown that appropriate image enhancements of remotely sensed data significantly improved the lithological discrimination and aided in field observations for lithological mapping. These studies pointed out that Landsat-8 with (OLI) sensor is considered one of the most effective data widely and successfully used for lithological mapping and exploration targets (Gabr et al, 2015;Hassan et al, 2015;Sadek et al, 2015;Asran et al, 2017;Aboelkhair et al, 2020;. The Landsat-8 data, in combination with other remotely sensed data (e.g., ASTER and Sentinel) have been used to discriminate the exposed lithological units of ENS.…”

Section: Remotely Sensed Data Processingmentioning

confidence: 99%

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

et al. 2022

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The Late Neoproterozoic Egyptian Nubian Shield (ENS) has attracted increasing attention since the establishment of the Egyptian Geological Survey and Mining Authority (EGSMA (1896)), which conducted the first mapping. In the last three decades, rapid improvements in analytical techniques, along with field-oriented studies, have made it possible for the interpretation of the ENS as an integral part of the juvenile Arabian–Nubian Shield (ANS) as a portion of the East African Orogen (EAO). However, a consistent tectonic map of the ENS does not exist. Presentation of such a map is the main objective of the present work where Landsat-based lithological discrimination is combined with the systematic structural investigation and careful reassessment of previously published geological maps. Our interpretation of this map indicates that in accordance with previous work, the basement units of the Eastern Desert (ED) can be divided into three structural domains: Northern, Central, and South-Eastern Desert provinces. The proposed provinces are ascribed to three different plate tectonic far-field boundary conditions. The earliest magmatic, metamorphic, and tectonic history was set off by the approximate north–south convergence of the Gabgaba-Gebeit, Jiddah-Asir terranes, and Eastern Desert-Midyan terranes along the Yanbo-Onib-Sol-Hamid-Gerf-Allaqi-Heiani (YOSHGAH) suture between c. 800 and 620 Ma. The second event between c. 640 and 580 Ma was correlated with the Nabitah Orogeny when the Ad Dawadimi-Ar Rayn terranes in the eastern Arabian Shield accreted to the earlier consolidated arc terranes (Afif and Tathlith terranes). During this period, east–west convergence between northwestern Saudi Arabia and the Central Eastern Desert (CED) in Egypt caused a pronounced strike-slip deformation associated with the displacement along the wider Najd Fault system. The third orogenic phase, which was younger than c. 580 Ma, was controlled by the evolution and retreat of the Cadomian Arc. The northern portions of the ENS and the northern Arabian Shield experienced extension whereas extensive post-orogenic magmatism was related to mantle delamination and associated crustal thinning.

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“…Although the granitoid rocks from the ANS have been subjected to numerous investigations concerning their petrogenesis and geotectonic evolution, but much controversy still persists for their source, regional geotectonic regimes and peculiar individual petrogenetic paths such as the role of fractional crystallization against crustal anatexis (e.g., Stern and Gottfried, 1986;Beyth et al, 1994). Therefore, different researches maintained that one group, or both groups, evolved by partial melting of lower/middle crustal materials or instead by fractionation of mantle-derived melts (e.g., Moghazi et al, 2001Moghazi et al, , 2012Moghazi, 2002;Farahat et al, 2007Farahat et al, , 2011Eliwa et al, 2008;Ali et al, 2009a;Azer, 2013;El-Bialy and Omar, 2015;Mahdy et al, 2015Asran et al, 2017;Sami et al, 2017;El-Bialy and Shata, 2018;Azer et al, 2019;El-Bialy et al, 2020). The Wadi El-Akhder area, southwestern Sinai, Egypt (Fig.…”

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Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

Mogahed

Abdelfadil

2021

Acta Geologica Sinica (Eng)

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Geology, structure, geochemistry and ASTER-based mapping of Neoproterozoic Gebel El-Delihimmi granites, Central Eastern Desert of Egypt

Cited by 24 publications

References 47 publications

Multispectral and Radar Data for the Setting of Gold Mineralization in the South Eastern Desert, Egypt

Multispectral and Radar Data for the Setting of Gold Mineralization in the South Eastern Desert, Egypt

The Tectonic Map and Structural Provinces of the Late Neoproterozoic Egyptian Nubian Shield: Implications for Crustal Growth of the Arabian–Nubian Shield (East African Orogen)

Constraints of Mantle and Crustal Sources Interaction during Orogenesis of Pre‐ and Post‐collision Granitoids from the Northern Arabian‐Nubian Shield: A Case Study from Wadi El‐Akhder Granitoids, Southern Sinai, Egypt

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