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dc.contributor.authorSchettino, Antonioes_ES
dc.contributor.authorMacchiavelli, Chiaraes_ES
dc.contributor.authorPierantoni, Pietro Paoloes_ES
dc.contributor.authorZanoni, Davidees_ES
dc.contributor.authorRasul, Najeeb Mes_ES
dc.identifier.citationGeophysical Journal International, 207(1): 457-480 (2016)es_ES
dc.description.abstractThe Red Sea and Gulf of Aden represent two young basins that formed between Africa and Arabia since the early Oligocene, floored by oceanic crust or by transitional and thinned continental crust. While in the easternmost Gulf of Aden, the rift-drift transition can be dated chron C6 (~20.1 Ma), here we show that in the Red Sea the first pulse of seafloor spreading occurred during chron C3n.2n (~4.6 Ma) around ~17.1°N (present-day coordinates) and propagated southwards from this location, separating the Danakil microplate from Arabia. It is also shown that seafloor spreading between Arabia and Nubia started later, around chron 2A (~2.58 Ma), and propagated northwards. At present, there is no magnetic evidence for the existence of a linear spreading centre in the northern Red Sea at latitudes higher than ~24°N and in the southern Red Sea below ~14.8°N. The present-day plate kinematics of this region can be described with high accuracy by a network of five interacting plates (Nubia, Arabia, Somalia, Sinai and Danakil) and six triple junctions. For times older than anomaly 2A (~2.58 Ma) and up to anomaly 3, the absence of marine magnetic anomalies between Arabia and Nubia prevents a rigorous kinematic description of the five-plates system. However, there is strong evidence that the unique changes in plate motions during the last 5 Myr were a dramatic slowdown at chron C2 (~1.77 Ma) in the spreading or extension rates along the ridge and rift axes, thereby a good representation of the real plate motions can be obtained anyway by backward extension of the oldest Arabia-Nubia and Arabia-Danakil stage rotations determined on the basis of marine magnetic anomalies, respectively, C2-C2A and C2A-C3. The proposed kinematic reconstructions are accompanied by a geodynamic explanation for the genesis of large continent-continent fracture zones at the rift-drift transition and by an analysis of the strain associated with plate motions in Afar, northeastern Egypt and Sinai. © The Authors 2016.es_ES
dc.description.sponsorshipThis work was funded by the MIUR, PRIN prot. 20125JKANY. The GEODAS ship-track data used in this study can be found at NGDC (http://www.ngdc.noaa.gov/mgg/geodas/trackline.html).es_ES
dc.publisherOxford University Presses_ES
dc.relation.isversionofPublisher's versiones_ES
dc.subjectKinematics of crustal and mantle deformationes_ES
dc.subjectMagnetic anomalieses_ES
dc.subjectmodelling and interpretationes_ES
dc.subjectMarine magnetics and palaeomagneticses_ES
dc.titleRecent kinematics of the tectonic plates surrounding the red sea and gulf of adenes_ES
dc.description.peerreviewedPeer reviewedes_ES
oprm.item.hasRevisionno ko 0 false*
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