Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications
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19 novembre 2022
- ISIDORE Id: 10670/1.a15efe...
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Oman paleogeography; plate-tectonicSujets proches
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Aymon Baud et al., « Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications », Serveur académique Lausannois, ID : 10670/1.a15efe...
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Three sections from Oman Wadi Musjah, Jebel Rabat A, and Jebel Aweri spanning the Changhsingian (Upper Permian) to Olenekian (Lower Triassic) are studied in detail to investigate changes in seawater chemistry during this interval (see other posters). We here define their palæo-location and palæogeography through time using the PANALESIS plate tectonic model. We propose that the sections of Wadi Musjah and Jebel Rabat A were part of a seamount (or seamount chain) located at some 900 km relative to where they are found now. The seamount(s) was (were) caught in the subduction prism of the Hawasina nappes and transported towards the Omani margin, before the Semail plate obduction brought them onto the passive margin where they are currently located. The third section Jebel Aweri has a different history. As part of the Batain Mountains, the section is proposed to belong to the Masirah tectonic element, a zone along the eastern Oman and Yemen margin, which underwent a transpressive motion, in particular in the Late Cretaceous – Palæogene when the India tectonic plate rotated relative to the Africa plate, triggering a ‘scissor effect’ with up to 250 km shortening and thrusting onto the Oman – Yemen passive margin. We infer that the “Eastern Ophiolite Belt” from the Masirah Island and metamorphism in the Batain is associated with this event.
