Rift migration explains continental margin asymmetry and crustal hyper-extension

Brune, Sascha; Heine, Christian; Pérez‐Gussinyé, M.; Sobolev, S. V.

doi:10.1038/ncomms5014

Cited by 331 publications

(393 citation statements)

References 72 publications

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“…Syntectonic sedimentation clearly results in a series of oceanward-growing and tilting sedimentary wedges, younging toward the ocean. The observation of CDNF along the Gabon margin is in accordance with previous observations (Ranero & Pérez Gussinyé, 2010;Skogseid, 2014) and numerical models (Brune et al, 2014) but is also in relative contradiction with the description of the West African non-magmatic margins, often represented with thick and wide sag basin (Contrucci et al, 2004;Moulin et al, 2005) that is described as "subsiding vertically without differential tilting" (Aslanian et al, 2009) resting on a "highly thinned, little faulted continental crust" (Unternehr et al, 2010). For us, interpretation of profiles GA1, GA2 and GA3 indicates that most of the sedimentary basins resting on top of the highly thinned continental crust are actually syn-rift and migrate outboard until break up.…”

Section: Iiica Origin Of the Cndfsupporting

confidence: 92%

“…For Brune et al, (2014) spreading of the continental crust is attributed to a rift migration maintained by sequential faulting in the brittle crust and lower crustal flow. For both Beaumont (2011, 2014) and Brune et al, (2014), lower crustal viscosity is a key-parameter, which strongly depends on the composition of the lower crust, its initial thermal state and the extension rate during ACCEPTED MANUSCRIPT…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

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, Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust, (2016), doi: 10.1016/j.gr.2017.04.030 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. A C C E P T E D M A N U S C R I P T Abstract:The

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Section: Iiica Origin Of the Cndfsupporting

confidence: 92%

Section: Accepted Manuscriptmentioning

confidence: 99%

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

et al. 2018

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“…involves crustal thickness variations (Harry and Grandel, 2007), strain softening (Brune et al, 2014;2017) or structural softening of the crust and sub-Moho mantle (Duretz et al, 2016). In absence of one of these factors, the overall deformation pattern is symmetrical in both analogue (Brun andBeslier, 1996, Nestola et al, 2013; and numerical (Nagel and Buck, 2004;Lavier and Manatchal, 2006;Burov, 2007b;Weinberg et al, 2007;Beaumont and Ings, 2012) models.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

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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“…Figure 1(c) shows a sectional schematic representation of the coupled numerical model with depth-dependent layered mantle viscosity structure ( Figure 1b) and seismic velocity-to-density scaling profile of Steinberger and Calderwood (2006) (Figure 1a), which are only considered below the depth of 300 km. The top 10 thermo-mechanical component (SLIM3D) has been used in a wide range of 2D and 3D regional numerical studies of crustal and lithospheric deformations (Popov and Sobolev, 2008;Brune et al, 2012Brune et al, , 2014Brune et al, , 2016Popov et al, 2012;Quinteros and Sobolev, 2013) with different spatial and temporal resolutions but the coupled code is used here and in Osei for the first time. In this 3D global study, we distinguish three material layers (phases) within the top component (SLIM3D): the crustal layer, the lithosphere and the sub-lithospheric mantle layers in order to account for the stress and temperature- visco-elasto-plastic rheology is described in detail by (Popov and Sobolev, 2008), with specific modeling parameters given in Osei and here in the appendix.…”

Section: Model Descriptionmentioning

confidence: 99%

Effects of upper mantle heterogeneities on lithospheric stress field and dynamic topography

Tutu¹,

Steinberger²,

Sobolev³

et al. 2017

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Abstract. The orientation and tectonic regime of the observed crustal/lithospheric stress field contribute to our knowledge of different deformation processes occurring within the Earth's crust and lithosphere. In this study, we analyze the influence of the thermal and density structure of the upper mantle on the lithospheric stress field and topography. We use a 3D lithosphereasthenosphere numerical model with power-law rheology, coupled to a spectral mantle flow code at 300 km depth. Our results are validated against the World Stress Map 2016 and the observation-based residual topography. We derive the upper mantle 5 thermal structure from either a heat flow model combined with a sea floor age model (TM1) or a global S-wave velocity model (TM2). We show that lateral density heterogeneities in the upper 300 km have a limited influence on the modeled horizontal stress field as opposed to the resulting dynamic topography that appears more sensitive to such heterogeneities. There is hardly any difference between the stress orientation patterns predicted with and without consideration of the heterogeneities in the upper mantle density structure across North America, Australia, and North Africa. In contrast, we find that the dynamic 10 topography is to a greater extent controlled by the upper mantle density structure. After correction for the chemical depletion of continents, the TM2 model leads to a much better fit with the observed residual topography giving a correlation of 0.51 in continents, but this correction leads to no significant improvement in the resulting lithosphere stresses. In continental regions with abundant heat flow data such as, for instant, Western Europe, TM1 results in relatively a small angular misfits of 18.30

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Rift migration explains continental margin asymmetry and crustal hyper-extension

Cited by 331 publications

References 72 publications

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Rifted margins: Ductile deformation, boudinage, continentward-dipping normal faults and the role of the weak lower crust

Crustal versus mantle core complexes

Effects of upper mantle heterogeneities on lithospheric stress field and dynamic topography

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