nubian shield
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2022 ◽  
pp. 105078
Author(s):  
Mohamed Zaki Khedr ◽  
Eiichi Takazawa ◽  
Christoph Hauzenberger ◽  
Akihiro Tamura ◽  
Shoji Arai ◽  
...  

Lithos ◽  
2021 ◽  
pp. 106525
Author(s):  
Hilmy E. Moussa ◽  
Mokhles K. Azer ◽  
Moustafa A. Abou El Maaty ◽  
Ayman E. Maurice ◽  
Nagy N. Yanni ◽  
...  

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Hamed Gamal El Dien ◽  
Zheng-Xiang Li ◽  
Mohamed Abu Anbar ◽  
Luc S. Doucet ◽  
J. Brendan Murphy ◽  
...  

AbstractThe growth of continental crust through melt extraction from the mantle is a critical component of the chemical evolution of the Earth and the development of plate tectonics. However, the mechanisms involved remain debated. Here, we conduct petrological and geochemical analyses on a large (up to 5000 km2) granitoid body in the Arabian-Nubian shield near El-Shadli, Egypt. We identify these rocks as the largest known plagiogranitic complex on Earth, which shares characteristics such as low potassium, high sodium and flat rare earth element chondrite-normalized patterns with spatially associated gabbroic rocks. The hafnium isotopic compositions of zircon indicate a juvenile source for the magma. However, low zircon δ18O values suggest interaction with hydrothermal fluids. We propose that the El-Shadli plagiogranites were produced by extensive partial melting of juvenile, previously accreted oceanic crust and that this previously overlooked mechanism for the formation of plagiogranite is also responsible for the transformation of juvenile crust into a chemically stratified continental crust.


2021 ◽  
Vol 359 ◽  
pp. 106211
Author(s):  
Hamed Gamal El Dien ◽  
Zheng-Xiang Li ◽  
Mohamed Abu Anbar ◽  
Luc S. Doucet ◽  
J. Brendan Murphy ◽  
...  

2021 ◽  
Vol 12 (4) ◽  
pp. 101148
Author(s):  
Ali A. Khudier ◽  
Jean-Louis Paquette ◽  
Kirsten Nicholson ◽  
Åke Johansson ◽  
Tyrone O. Rooney ◽  
...  

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