Dramatic effect of elasticity on thermal softening and strain localization during lithospheric shortening

Détails

ID Serval
serval:BIB_B3321671F7D2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Dramatic effect of elasticity on thermal softening and strain localization during lithospheric shortening
Périodique
Geophysical Journal International
Auteur⸱e⸱s
Jaquet Y., Duretz T., Schmalholz S.M.
ISSN
0956-540X
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
204
Pages
780-784
Langue
anglais
Résumé
We present two-dimensional numerical simulations for shortening a viscoelastoplastic lithosphere to quantify the impact of elasticity on strain localization due to thermal softening. The model conserves energy and mechanical work is converted into heat or stored as elastic strain energy. For a shear modulus G = 10^10 Pa, a prominent lithospheric shear zone forms and elastic energy release increases the localization intensity (strain rate amplification). For G = 5 × 10^10 Pa shear zones still form but deformation is less localized. For G = 10^12 Pa, the lithosphere behaves effectively viscoplastic and no shear zones form during homogeneous thickening. Maximal shearing-related increase of surface heat flux is 15-25 mW.m^−2 and of temperature at lower crustal depth is ∼150 °C, whereby these peak values are transient (0.1-1 My). Elasticity and related energy release can significantly contribute to strain localization and plate-like behaviour of the lithosphere required for plate tectonics.
Création de la notice
14/03/2016 14:24
Dernière modification de la notice
20/08/2019 15:21
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