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- W3179067815 abstract "Abstract The 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 km 2 ) 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 δ 18 O 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." @default.
- W3179067815 created "2021-07-19" @default.
- W3179067815 creator A5008012610 @default.
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- W3179067815 creator A5089783927 @default.
- W3179067815 date "2021-07-05" @default.
- W3179067815 modified "2023-10-16" @default.
- W3179067815 title "The largest plagiogranite on Earth formed by re-melting of juvenile proto-continental crust" @default.
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