Thermomechanical modelling of slab detachment

Gerya, Taras; Yuen, David A.; Maresch, Walter V.

doi:10.1016/j.epsl.2004.07.022

Cited by 269 publications

(160 citation statements)

References 40 publications

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“…[16] Previous numerical and analogue studies on continental collision showed that both delamination [Schott and Schmeling, 1998;Morency and Doin, 2004;Göğüş and Pysklywec, 2008;Valera et al, 2008;Göğüş et al, 2011;Bajolet et al, 2012;Ueda et al, 2012] and slab detachment [Davies and Von Blanckenburg, 1995;Wong A Ton and Wortel, 1997;Gerya et al, 2004;Toussaint et al, 2004;Andrews and Billen, 2009;Burkett and Billen, 2009;Duretz et al, 2011;van Hunen and Allen, 2011] are likely to occur. The major control of the lower crustal strength on the evolution of delamination that we observe is consistent with previous models [Schott and Schmeling, 1998;Morency and Doin, 2004].…”

Section: Discussionmentioning

confidence: 99%

Delamination vs. break-off: the fate of continental collision

Magni¹,

Faccenna²,

Hunen³

et al. 2012

Geophys. Res. Lett.

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The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. [1] The fate of a convergent continental margin is investigated. We perform a set of 2D numerical models to study how and why continental collision can evolve in different scenarios. Since the rheology of continental lithosphere has a major control on the dynamics of subduction, we explore a range of different lithosphere and lower crust viscosity values to understand their sensitivity on the possible scenarios. We find that with a rheologically layered crust both delamination and break-off are feasible. We identify three modes: (1) slab detachment, in which the lithospheric mantle and the crust are strongly coupled, subduction slows down and the slab eventually breaks; (2) delamination of the lithospheric mantle that separates from the crust and continue to subduct and (3) an intermediate mode where the lithospheric mantle and the crust remain partially coupled, resulting in an initial stage of delamination followed by the slow down and cessation of subduction.

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Section: Discussionmentioning

confidence: 99%

Delamination vs. break-off: the fate of continental collision

Magni¹,

Faccenna²,

Hunen³

et al. 2012

Geophys. Res. Lett.

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“…[4] We use the modified thermomechanical I2VIS code, which uses a nondiffusive marker-in-cell technique [Gerya and Yuen, 2003b;Gerya et al, 2004a]. The initial thermomechanical setup is based on a 2-D subduction model ( Figure B1 in Appendix B).…”

Section: Petrological and Thermomechanical Modelmentioning

confidence: 99%

Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

Gorczyk

Gerya

Connolly

et al. 2006

Geochem Geophys Geosyst

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[1] Using a combined finite difference and marker-in-cell technique, we performed two-dimensional coupled petrological-thermomechanical numerical simulations of intraoceanic subduction. The simulations indicate that parts of the mantle wedge can become trapped between rheologically weak, hydrated, and partially molten upwellings (cold plumes) and the subducting slab. The structures form at various depths and develop circular, elliptic, or irregular shapes. The combined effect of the tractions caused by upwelling and subduction causes these regions to rotate. Our simulations investigate the parameters controlling the occurrence and long-term stability of such rigid, rotating structures. Circular rotating structures like ''subduction wheels'' are characteristic of models with relatively young (20-30 Myr) slabs and intermediate (2-5 cm/yr) subduction rates. We propose that the development of such circular features may explain some of the isolated seismic velocity anomalies in the mantle wedge.

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“…Due to the increased interest in the process of slab tearing, it has recently been the subject of several numerical modeling studies (e.g. Gerya et al, 2004;Andrews and Billen, 2009;Billen, 2009, 2010;van Hunen and Allen, 2011;Duretz et al, 2012Duretz et al, , 2014. Numerical modeling of slab detachment is computationally 20 challenging due to the mesh-resolution dependency of the strain (van Hunen and Allen, 2011) and the gradual decrease in monitoring particle density, the gradual overlapping of level sets (Hillebrand et al, 2014), or the gradual thinning of compositional fields (as is the case here) in the detachment area.…”

Section: The Slab Detachment Benchmark 15mentioning

confidence: 99%

Implementing nonlinear viscoplasticity in ASPECT: benchmarking and applications to 3D subduction modeling

Glerum

Thieulot

Fraters

et al. 2017

Preprint

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Abstract. ASPECT (Advanced Solver for Problems in Earth's ConvecTion) is a massively parallel finite element code originally designed for modeling thermal convection in the mantle with a Newtonian rheology. The code is characterized by modern numerical methods, high-performance parallelism and extensibility. This last characteristic is illustrated in this work: we have extended the use of ASPECT from global thermal convection modeling to upper mantle-scale applications of subduction.Subduction modeling generally requires the tracking of multiple materials with different properties and with nonlinear 5 viscous and viscoplastic rheologies. To this end, we implemented a frictional plasticity criterion that is combined with a viscous diffusion and dislocation creep rheology. Because ASPECT uses compositional fields to represent different materials (and, since recently, tracers), all material parameters are made dependent on a user-specified number of fields.The goal of this paper is primarily to describe and validate our implementations of complex, multi-material rheology by reproducing the results of four well-known two-dimensional benchmarks: the indentor benchmark, the brick experiment, the 10 sandbox experiment and the slab detachment benchmark. Furthermore, we aim to provide hands-on examples for prospective users by demonstrating the use of multi-material viscoplasticity with three-dimensional, thermomechanical models of oceanic subduction, putting ASPECT on the map as a community code for high-resolution, nonlinear rheology subduction modeling.

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Thermomechanical modelling of slab detachment

Cited by 269 publications

References 40 publications

Delamination vs. break-off: the fate of continental collision

Delamination vs. break-off: the fate of continental collision

Large‐scale rigid‐body rotation in the mantle wedge and its implications for seismic tomography

Implementing nonlinear viscoplasticity in ASPECT: benchmarking and applications to 3D subduction modeling

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