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- W2079854701 abstract "Results of seismic and other geophysical investigations suggest that strike-slip processes controlled the break-up of the Arabian plate from Africa and initiated the Red Sea Rift. Early oceanisation was facilitated by nucleation of pull apart basins and massive intrusives. The evolution of the Red Sea has gone through different stages. It was a zone of structural weakness already during the Pan-African orogeny approximately 600 Ma. A major reactivation, however, that gradually led to the present-day configuration was initiated during the late Oligocene with intense magmatic activity and the development of a continental rift. Wrench faulting played a key role in the early evolution of the Red Sea, as it shaped most of its western flank as a sharp plate boundary and resulted in the generation and rapid oceanisation of linearly arranged pull apart basins. Spatial distribution of these basins reflects the geometry of the strike-slip zone, which was controlled by pre-existing fault systems like the Najd Shear System, the Central African Fault Zone or the Onib-Hamisana and Baraka suture zones. Strike-slip motion along the latter zones of weakness influenced mainly the Egyptian and Sudanese coastal areas. Arabia was therefore separated from Africa by oceanisation in those regions, where pull apart basins developed. They were still connected in the in-between segments by stretched continental crust. With Arabia as the “moving” and Africa as the “stable” plate the eastern Red Sea flank was formed by pure shear through stretching, thinning and diffuse extension. As a consequence, the eastern and western flanks of the Red Sea are asymmetrical. The acceleration of the movement of Arabia in early/middle Miocene could no longer be accommodated by the opening in the Gulf of Suez and consequently the Dead Sea strike-slip fault developed approximately 14 Ma ago. Since plate motion was still oblique to the major structural trends, the pull apart evolution on the western flank continued and the oceanisation was accentuated, while in the north the eastern flank developed en-echelon fractures of “Aqaba-orientation”. Seafloor spreading commenced 5 Ma ago at parts of the central and southern Red Sea. This final stage is also responsible for the bathymetry with maximum depth values of 3000 m in the seafloor spread areas and a much shallower basin in the north. The metalliferous “Red Sea deeps” are either associated with this infant mid-ocean ridge or with the en-echelon fractures in the north." @default.
- W2079854701 created "2016-06-24" @default.
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- W2079854701 date "1991-11-01" @default.
- W2079854701 modified "2023-10-14" @default.
- W2079854701 title "Shear-controlled evolution of the Red Sea: pull apart model" @default.
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- W2079854701 doi "https://doi.org/10.1016/0040-1951(91)90166-p" @default.
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