Articles | Volume 11, issue 6
https://doi.org/10.5194/se-11-2327-2020
https://doi.org/10.5194/se-11-2327-2020
Research article
 | 
07 Dec 2020
Research article |  | 07 Dec 2020

Impact of upper mantle convection on lithosphere hyperextension and subsequent horizontally forced subduction initiation

Lorenzo G. Candioti, Stefan M. Schmalholz, and Thibault Duretz

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Cited articles

Agrusta, R., van Hunen, J., and Goes, S.: Strong plates enhance mantle mixing in early Earth, Nat. Commun., 9, 1–10, 2018. a, b
Baes, M., Sobolev, S. V., and Quinteros, J.: Subduction initiation in mid-ocean induced by mantle suction flow, Geophys. J. Int., 215, 1515–1522, 2018. a, b
Beaussier, S. J., Gerya, T. V., and Burg, J.-P.: 3D numerical modelling of the Wilson cycle: structural inheritance of alternating subduction polarity, Geological Society, London, Special Publications, 470, 439–461, 2019. a
Becker, T. W.: Superweak asthenosphere in light of upper mantle seismic anisotropy, Geochem. Geophy. Geosy., 18, 1986–2003, 2017. a
Behn, M. D., Conrad, C. P., and Silver, P. G.: Detection of upper mantle flow associated with the African Superplume, Earth Plane. Sc. Lett., 224, 259–274, 2004. a, b, c
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With computer simulations, we study the interplay between thermo-mechanical processes in the lithosphere and the underlying upper mantle during a long-term (> 100 Myr) tectonic cycle of extension–cooling–convergence. The intensity of mantle convection is important for (i) subduction initiation, (ii) the development of single- or double-slab subduction zones, and (iii) the forces necessary to initiate subduction. Our models are applicable to the opening and closure of the western Alpine Tethys.
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