Reaction-induced volume change triggers brittle failure at eclogite facies conditions

Yamato, Philippe; Duretz, Thibault; Baïsset, Marie; Luisier, Cindy

doi:10.1016/j.epsl.2022.117520

Cited by 8 publications

(13 citation statements)

References 79 publications

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“…We use the 2D numerical code MDOODZ 38 , 42 based on the finite difference method/marker-in-cell approach, which is suitable for the study deformation of heterogenous visco-elasto-plastic materials. The latest developments incorporate the effect of compressibility and progressive mineral transformations on rheology and strain localization 37 . The equation of momentum is formulated as: where denotes the deviatoric strain rate tensor components, is the pressure and corresponds to the spatial coordinates.…”

Section: Methodsmentioning

confidence: 99%

“…Recent improvements in computing tools enable us to account for complex geometries (e.g., multiple mineral phases, digitalized thin sections). In contrast with past studies, elastic, viscous and plastic properties of the phases are now also incorporated, which allows for consistently simulating the coupling between reaction-induced volume changes and deformation 37 . Furthermore, recent studies have shown that UHP rocks, such as eclogites and, in particular, the mineral garnet, can deform in a brittle manner at high P conditions, where they are expected to be viscous 37 , 38 .…”

Section: Introductionmentioning

confidence: 99%

“…In contrast with past studies, elastic, viscous and plastic properties of the phases are now also incorporated, which allows for consistently simulating the coupling between reaction-induced volume changes and deformation 37 . Furthermore, recent studies have shown that UHP rocks, such as eclogites and, in particular, the mineral garnet, can deform in a brittle manner at high P conditions, where they are expected to be viscous 37 , 38 . In fact, the brittle-ductile transition (BDT) of garnet for a whole range of strain rates intersects the decompression path of the UHP rocks such as the Dora Maira Massif (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Garnet microstructures suggest ultra-fast decompression of ultrahigh-pressure rocks

Luisier,

Tajčmanová,

Yamato

et al. 2023

Nat Commun

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Plate tectonics is a key driver of many natural phenomena occurring on Earth, such as mountain building, climate evolution and natural disasters. How plate tectonics has evolved through time is still one of the fundamental questions in Earth sciences. Natural microstructures observed in exhumed ultrahigh-pressure rocks formed during continental collision provide crucial insights into tectonic processes in the Earth’s interior. Here, we show that radial cracks around SiO2 inclusions in ultrahigh-pressure garnets are caused by ultrafast decompression. Decompression rates of at least 8 GPa/Myr are inferred independently of current petrochronological estimates by using thermo-mechanical numerical modeling. Our results question the traditional interpretation of fast and significant vertical displacement of ultrahigh-pressure tectonic units during exhumation. Instead, we propose that such substantial decompression rates are related to abrupt changes in the stress state of the lithosphere independently of the spatial displacement.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Garnet microstructures suggest ultra-fast decompression of ultrahigh-pressure rocks

Luisier,

Tajčmanová,

Yamato

et al. 2023

Nat Commun

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“…Viscoplasticity is straightforward to implement and is already used in codes such as LaMEM (Moulas et al., 2022), M2Di (Duretz et al., 2020) and MDoodz (Duretz et al., 2021; Yamato et al., 2022). Nevertheless, a finer control on shear banding patterns is achievable using spatial regularizations such as gradient plasticity or Cosserat continuum.…”

Section: Implications For Geodynamic Simulation Toolsmentioning

confidence: 99%

A Comparison of Plasticity Regularization Approaches for Geodynamic Modeling

Duretz

Räss

Borst

et al. 2023

Geochem Geophys Geosyst

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Strain localization is ubiquitous and controls the development of shear zones and the establishment of plate boundaries. The outermost portion of the lithosphere, the crust, is relatively cold. In these regions, deformation is governed by elasto-plasticity, which allows tectonic plates to behave both as rigid solid and, locally, as a deformable solid. The rocks that make up the crust exhibit a frictional behavior, which causes their strength to depend on pressure (Byerlee, 1978). Moreover, the dilatancy angles of rocks are generally smaller than friction angles (Zhao & Cai, 2010), therefore frictional plasticity models should be non-associated. Geodynamic models are typically employed to simulate the deformations of the Earth's upper shell, such as the opening of rifts zone (e.g., Naliboff et al., 2017), the growth of orogenic wedges (e.g., Buiter et al., 2016), or the formation of transform boundaries (e.g., Gerya, 2013) heavily rely on the simulation of frictional deformation processes. Nonetheless, the inclusion of frictional plasticity in numerical models poses problems as standard model implementations may not achieve force equilibrium and may exhibit mesh dependence. The absence of characteristic spatial or temporal scales in standard frictional constitutive laws is the primary cause for these problems. To overcome these issues, models should be augmented by including additional physics (e.g., fluid pressure diffusion, viscoplastic dissipation) (e.g., Brantut et al., 2017), which from a mathematical point of view can be considered as regularization techniques (e.g., de Borst et al., 1993).Numerous regularization strategies have been proposed, which have the effect of introducing a length or a time scale in the model. Viscoplastic regularization relies on the inclusion of a time scale W. M. Wang et al., 1997) which implicitly rather than directly introduces a length scale like in (e.g., H. Wang, 2019). The yield function does not depend on the gradients of plastic strain: it is defined locally. As a consequence, return mapping can be achieved without solving an additional partial differential equation. Thus, the total number of degrees of freedom is not increased. The implementation of viscoplastic regularization in existing codes is

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“…Indeed, both stress and pressure field at the tip of the propagating eclogite finger are expected to be transiently disturbed by (i) the volume change associated with plagioclase breakdown, as at the tip of an elongated inclusion (Sternlof et al 2005;Yamato et al 2022), or (ii) strength drop due to eclogitization (Mancktelow 2008;Moulas et al 2014), the combination of the two being also possible. The part of the rock located at the tip of the finger (Fig.…”

Section: Implications For the Early Mechanical Alteration Of The Reac...mentioning

confidence: 99%

Twinning and partial melting as early weakening processes in plagioclase at high pressure: insights from Holsnøy (Scandinavian Caledonides, Norway)

Baïsset

Labrousse

Yamato

et al. 2023

Contrib Mineral Petrol

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Reaction-induced volume change triggers brittle failure at eclogite facies conditions

Cited by 8 publications

References 79 publications

Garnet microstructures suggest ultra-fast decompression of ultrahigh-pressure rocks

Garnet microstructures suggest ultra-fast decompression of ultrahigh-pressure rocks

A Comparison of Plasticity Regularization Approaches for Geodynamic Modeling

Twinning and partial melting as early weakening processes in plagioclase at high pressure: insights from Holsnøy (Scandinavian Caledonides, Norway)

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