Computational approaches to studying non-linear dynamics of the crust and mantle

Moresi, Louis; Quenette, Steve; Lemiale, Vincent; Meriaux, Catherine Anne Marie Dominique; Appelbe, Bill; Mühlhaus, H. B.

doi:10.1016/j.pepi.2007.06.009

Cited by 246 publications

(181 citation statements)

References 48 publications

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“…The exhumation of lower crust is simulated in a 3D Cartesian geometry using a visco-plastic rheology with the numerical 30 code Underworld (Moresi et al, 2003(Moresi et al, , 2007. The code uses a Lagrangian PIC finite element scheme.…”

Section: Methods and Model Setupmentioning

confidence: 99%

“…CC BY 4.0 License. momentum and energy conservation equations are solved under the Underworld standard modelling framework, which is expressed as follows (Moresi et al, 2003(Moresi et al, , 2007):…”

Section: Methods and Model Setupmentioning

confidence: 99%

“…gradient of 20 °C/km. The solid-deformation behaviour is modelled with a depth-dependent yielding criterion (Drucker and Prager, 2013), which is expressed as follows (Moresi et al, 2007;Sharples et al, 2015):…”

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confidence: 99%

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3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

Feng

Wang

Ganne

et al. 2018

Preprint

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Abstract. High-grade tectono-metamorphic domains in the Sefwi terrane of Ghana are separated from adjacent low-grade greenstone belts by two main shear zones. The high-grade rocks are thought to have been exhumed along sinistral shear zones during the D2 ENE-WSW transtension. To better understand the role boundary conditions and the spatial relationship of faults play in the re-distribution of partially molten lower crust, ten 3D thermo-mechanical models have been constructed.The results show that the normal component of velocity boundary conditions mainly controls the exhumation of the lower 15 crust which occurred along pre-existing faults, while the exhumation in the relay zones between faults is controlled by the ratio of extension rate to shear rate applied at the boundaries. The strike of the exhumation belt made of partially molten lower crust rocks in the relay zone is sub-orthogonal to the transtension direction. The isostatic compensation from lowdensity upper mantle to overlying crust (thinning) is higher under transtension than under extension. 20The lower crust exhumation influenced by inherited shear zones can be used to better understand the loci of the high-grade rocks in the Sefwi terrane. We suggest that the Kukuom-Juaboso domain composed of up to amphibolite-migmatite facies probably resulted from the concentration of partially molten rocks in the relay zone between the Ketesso and Kenyase shear zones during the D2 ENE-WSW transtension. The two shear zones probably underwent two main stages for growth and maturation from the D1 to D2 deformation phases. The regional exhumation of the high-grade rocks in the Sefwi terrane 25 probably occurred within a duration of less than 5Ma.

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Section: Methods and Model Setupmentioning

confidence: 99%

Section: Methods and Model Setupmentioning

confidence: 99%

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3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

Feng

Wang

Ganne

et al. 2018

Preprint

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“…Thermal models of Danis et al (2012) were developed using a finiteelement code, named "Underworld" designed by Moresi et al (2007). The model applies constant top and bottom conditions of 15 and 350 °C, respectively, with reflecting side conditions.…”

Section: Previous Thermal Modellingmentioning

confidence: 99%

The effect of temperature-dependent thermal conductivity on the geothermal structure of the Sydney Basin

et al. 2018

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“…It is clear that continental break-up can only be achieved if there is localization of deformation (Le Pourhiet et al, 2013;Moresi et al, 2007;Regenauer-Lieb et al, 2008). This is achieved by feedback and possibly the presence of magma (Corti et al, 2003).…”

Section: Break-up Mechanicsmentioning

confidence: 99%

Breaking supercontinents; no need to choose between passive or active

Wolstencroft

Davies

2017

Solid Earth

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Abstract. Much debate has centred on whether continental break-up is predominantly caused by active upwelling in the mantle (e.g. plumes) or by long-range extensional stresses in the lithosphere. We propose the hypothesis that global supercontinent break-up events should always involve both. The fundamental principle involved is the conservation of mass within the spherical shell of the mantle, which requires a return flow for any major upwelling beneath a supercontinent. This shallow horizontal return flow away from the locus of upwelling produces extensional stress. We demonstrate this principle with numerical models, which simultaneously exhibit both upwellings and significant lateral flow in the upper mantle. For non-global break-up the impact of the finite geometry of the mantle will be less pronounced, weakening this process. This observation should motivate future studies of continental break-up to explicitly consider the global perspective, even when observations or models are of regional extent.

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Computational approaches to studying non-linear dynamics of the crust and mantle

Cited by 246 publications

References 48 publications

3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

3D numerical modelling of the re-distribution of partially molten lower crust rocks in relay zones between faults during transtension: Implications for the Sefwi terrane, SW Ghana

The effect of temperature-dependent thermal conductivity on the geothermal structure of the Sydney Basin

Breaking supercontinents; no need to choose between passive or active

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