Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications
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Version: Final published version
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serval:BIB_4F21DA80ECD4
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Actes de conférence (partie): contribution originale à la littérature scientifique, publiée à l'occasion de conférences scientifiques, dans un ouvrage de compte-rendu (proceedings), ou dans l'édition spéciale d'un journal reconnu (conference proceedings).
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Titre
Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications
Titre de la conférence
20th Swiss Geoscience Meeting, Lausanne 2022
Statut éditorial
Publié
Date de publication
19/11/2022
Langue
anglais
Résumé
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.
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.
Mots-clé
Oman paleogeography, plate-tectonic
Création de la notice
25/11/2022 12:08
Dernière modification de la notice
26/11/2022 8:10
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