Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges

We perform numerical modelling to simulate the shortening of an oceanic basin and the adjacent continental margins in order to discuss the relationship between compressional stresses acting on the lithosphere and the time dependent strength of the mid-oceanic ridges within the frame of subduction in...

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Autores principales:	A. Auzemery, E. Willingshofer, P. Yamato, T. Duretz, F. Beekman
Formato:	article
Lenguaje:	EN
Publicado:	Frontiers Media S.A. 2021
Materias:	subduction initiation passive margins convergence rate mid-oceanic ridge Alps Science Q
Acceso en línea:	https://doaj.org/article/3a5c8f39b0b045a9893308d11744609e
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spelling	oai:doaj.org-article:3a5c8f39b0b045a9893308d11744609e2021-12-02T11:16:34ZKinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges2296-646310.3389/feart.2021.765893https://doaj.org/article/3a5c8f39b0b045a9893308d11744609e2021-12-01T00:00:00Zhttps://www.frontiersin.org/articles/10.3389/feart.2021.765893/fullhttps://doaj.org/toc/2296-6463We perform numerical modelling to simulate the shortening of an oceanic basin and the adjacent continental margins in order to discuss the relationship between compressional stresses acting on the lithosphere and the time dependent strength of the mid-oceanic ridges within the frame of subduction initiation. We focus on the role of stress regulating mechanisms by testing the stress–strain-rate response to convergence rate, and the thermo-tectonic age of oceanic and continental lithospheres. We find that, upon compression, subduction initiation at passive margin is favoured for thermally thin (Palaeozoic or younger) continental lithospheres (<160 km) over cratons (>180 km), and for oceanic basins younger than 60 Myr (after rifting). The results also highlight the importance of convergence rate that controls stress distribution and magnitudes in the oceanic lithosphere. Slow convergence (<0.9 cm/yr) favours strengthening of the ridge and build-up of stress at the ocean-continent transition allowing for subduction initiation at passive margins over subduction at mid-oceanic ridges. The results allow for identifying geodynamic processes that fit conditions for subduction nucleation at passive margins, which is relevant for the unique case of the Alps. We speculate that the slow Africa–Europe convergence between 130 and 85 Ma contributes to the strengthening of the mid-oceanic ridge, leading to subduction initiation at passive margin 60–70 Myr after rifting and passive margin formation.A. AuzemeryA. AuzemeryE. WillingshoferP. YamatoP. YamatoT. DuretzT. DuretzF. BeekmanFrontiers Media S.A.articlesubduction initiationpassive marginsconvergence ratemid-oceanic ridgeAlpsScienceQENFrontiers in Earth Science, Vol 9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	subduction initiation passive margins convergence rate mid-oceanic ridge Alps Science Q
spellingShingle	subduction initiation passive margins convergence rate mid-oceanic ridge Alps Science Q A. Auzemery A. Auzemery E. Willingshofer P. Yamato P. Yamato T. Duretz T. Duretz F. Beekman Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
description	We perform numerical modelling to simulate the shortening of an oceanic basin and the adjacent continental margins in order to discuss the relationship between compressional stresses acting on the lithosphere and the time dependent strength of the mid-oceanic ridges within the frame of subduction initiation. We focus on the role of stress regulating mechanisms by testing the stress–strain-rate response to convergence rate, and the thermo-tectonic age of oceanic and continental lithospheres. We find that, upon compression, subduction initiation at passive margin is favoured for thermally thin (Palaeozoic or younger) continental lithospheres (<160 km) over cratons (>180 km), and for oceanic basins younger than 60 Myr (after rifting). The results also highlight the importance of convergence rate that controls stress distribution and magnitudes in the oceanic lithosphere. Slow convergence (<0.9 cm/yr) favours strengthening of the ridge and build-up of stress at the ocean-continent transition allowing for subduction initiation at passive margins over subduction at mid-oceanic ridges. The results allow for identifying geodynamic processes that fit conditions for subduction nucleation at passive margins, which is relevant for the unique case of the Alps. We speculate that the slow Africa–Europe convergence between 130 and 85 Ma contributes to the strengthening of the mid-oceanic ridge, leading to subduction initiation at passive margin 60–70 Myr after rifting and passive margin formation.
format	article
author	A. Auzemery A. Auzemery E. Willingshofer P. Yamato P. Yamato T. Duretz T. Duretz F. Beekman
author_facet	A. Auzemery A. Auzemery E. Willingshofer P. Yamato P. Yamato T. Duretz T. Duretz F. Beekman
author_sort	A. Auzemery
title	Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
title_short	Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
title_full	Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
title_fullStr	Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
title_full_unstemmed	Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges
title_sort	kinematic boundary conditions favouring subduction initiation at passive margins over subduction at mid-oceanic ridges
publisher	Frontiers Media S.A.
publishDate	2021
url	https://doaj.org/article/3a5c8f39b0b045a9893308d11744609e
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Kinematic Boundary Conditions Favouring Subduction Initiation at Passive Margins Over Subduction at Mid-oceanic Ridges

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