New parametric implementation of metamorphic reactions limited by water content, impact on exhumation along detachment faults

Mezri, Leila; Pourhiet, Laëtitia Le; Wolf, Sylvie; Burov, Evgenii

doi:10.1016/j.lithos.2015.08.021

Cited by 17 publications

(9 citation statements)

References 110 publications

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“…In models that integrate phase transitions controlled by pressure, temperature and the local amount of free fluid that comes from both external (meteoric) and local (dehydration) sources show a strong positive feedback between the asymmetry of the tectonic structures and the depth of penetration of meteoric fluids. From a general point of view, it must be noted that all models involving some type of strain softening favor asymmetric strain localization and the development of a rolling hinge type detachment, even in models where displacements are applied symmetrically and whatever the type of localizing perturbation (Lavier et al, 1999;2000;Lavier and Buck, 2002;Wijns et al, 2005;Gessner et al, 2007;Rey et al, 2009a;2009b;Tirel et al, 2009;Mezri et al, 2015;Schenker et al, 2012;Wang et al, 2015;Wu et al, 2015;Wu and Lavier, 2015). This suggests that strain softening could play a dominant role in the development of detachments and therefore in the evolution of core complex models.…”

Section: Comparison Of With Other Numerical Modelsmentioning

confidence: 99%

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Crustal versus mantle core complexes

et al. 2018

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Contrary to what is commonly believed, it is argued from analogue and numerical models that detachments that accommodate exhumation of core complexes do not initiate at the onset of extension but in the course of progressive extension when the exhuming ductile crust reaches the surface. In models, convex upward detachments result from a rolling hinge process. A C C E P T E D M A N U S C R I P TMantle core complexes develop in either the oceanic lithosphere, at slow and ultra-slow spreading ridges, or in continental lithospheres, whose initial Moho temperature is lower than 750°C, with "sub-Moho mantle-dominated" strength profiles. It is argued that the mechanism of mantle exhumation at passive margins is a nearly symmetrical necking process at ACCEPTED MANUSCRIPTA C C E P T E D M A N U S C R I P T 2 lithosphere scale without major and permanent detachment, except if strong strain localization could occur in the lithosphere mantle. Distributed crustal extension, by upper crust faulting above a décollement along the ductile crust increases toward the rift axis up to crustal breakup.Mantle rocks exhume in the zone of crustal breakup accommodated by conjugate mantle shear zones that migrate with the rift axis, during increasing extension.

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Section: Comparison Of With Other Numerical Modelsmentioning

confidence: 99%

“…Koyi and Skelton, 2001;Tirel et al, 2004;Gessner et al, 2007;Rey et al, 2009b;Huet et al, 2011;Mezri et al, 2015;Wang et al, 2015). However, because…”

Section: Comparison Of With Other Numerical Modelsmentioning

confidence: 99%

Crustal versus mantle core complexes

et al. 2018

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“…for continental lithospheres of ages 400 My and 100 My respectively for the Eastern and Western domains (Burov & Diament, 1995 (Mezri et al, 2015). Here we opted for simpler temperature dependent melting conditions M(T), similarly to Gerya et al, (2008).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

Crustal exhumation during ongoing compression in the Variscan Maures-Tanneron Massif, France-Geological and thermo-mechanical aspects

et al. 2018

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The Maures-Tanneron Massif (MTM), together with Corsica and Sardinia, represent the Southeastern branch of the huge European Variscan belt. A continuous evolution from continental collision to exhumation is described from ca. 350 Ma to ca. 320 Ma, based on an extended compilation of available geological and geochronogical data. This geological compilation is complemented with thermo-mechanical modelling that tests the conditions under which deep-seated HP units can melt and exhume massively during continued convergence. We simulate in two-dimensions the development of gravitational instabilities in a partially melting crust, depending on rheological layering and heat sources, and accounting for temperature dependent elasto-visco-plastic rheologies. In order to reproduce PT exhumation patterns in the MTM, over the appropriate time-scale (>20 My) and spatial extent (>100 km), a best fit was obtained with a convergence rate of 0.5 cm/yr and moderate diffusive surface processes. The contribution of radiogenic heating in the pre-stacked felsic crustal units is crucial. A lateral alternation with mafic units is also required in order to prevent lateral spreading of the orogen. A low viscosity partially molten crust (10² Pa.s, thus rather felsic) accompanies crustal exhumation in a decoupled mode from the deeper mantle. A shallow asthenosphere below the orogen (LAB at ~70 km depth, eg. shallow slab break-off) produces too warm and sudden exhumation as opposed to a competent mantle lithosphere (120 km depth LAB) that restrains it. The MTM witnesses the typical competition between far-field plate convergence and internal body forces, and our study pleads for a progressive evolution of transpression towards perpendicular extension from ca. 320 Ma.

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“…Reynolds and Lister, 1987;Huet et al, 2011). Because detachments may correspond to permeable structures deeply rooted down to the brittle-ductile transition (Famin et al, 2004;Mezri et al, 2015), active extensional domains in back-arc regions could represent favorable settings for HEGRs. The possible sources of heat responsible for regional high temperature-low pressure (HT-LP) metamorphic overprint recorded in these MCCs include (i) heating associated with thermal diffusion of excess heat generated by nappe stacking (increased radiogenic crustal heat, e.g.…”

Section: Introductionmentioning

confidence: 99%