Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications
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State: Public
Version: Final published version
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Serval ID
serval:BIB_4F21DA80ECD4
Type
Inproceedings: an article in a conference proceedings.
Publication sub-type
Poster: Summary – with images – on one page of the results of a researche project. The summaries of the poster must be entered in "Abstract" and not "Poster".
Collection
Publications
Institution
Title
Tracking back Permian--Triassic sections from Oman over the Mesozoic --Cenozoic: Geodynamic and paleogeographic implications
Title of the conference
20th Swiss Geoscience Meeting, Lausanne 2022
Publication state
Published
Issued date
19/11/2022
Language
english
Abstract
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.
Keywords
Oman paleogeography, plate-tectonic
Create date
25/11/2022 12:08
Last modification date
26/11/2022 8:10
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