Numerical Modeling of Rifting: An Overviewx

Pérez‐Gussinyé, M.; Liu, Zhonglan

doi:10.1002/9781119986928.ch5

Cited by 3 publications

(1 citation statement)

References 107 publications

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“…The flowing or non-flowing behaviour of the lower crust is controlled by its strength, which determines its efficiency as a decoupling layer. The strength of the viscous lower crust depends on both temperature and extension rates [Brun, 2002], evolving during extension: viscous material strengthens for higher strain rates and weakens with increasing temperature [Brun, 2002, see also review by Pérez-Gussinyé and Liu, 2022]. More generally, extensional modes and final rifted margin morphology are controlled by the presence or absence of decoupling levels within the lithosphere [Buck, 1991, Huet et al, 2011a, Brun and Beslier, 1996, Duretz et al, 2016.…”

Section: Different Modes Of Lithospheric Thinningmentioning

confidence: 99%

Extension of continental lithosphere in rifted margins: a review of thinning mechanisms

Tugend,

Mohn,

Duretz

et al. 2024

Comptes Rendus. Géoscience

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Crustal geometries imaged at rifted margins show contrasted first-order morphologies (wide and narrow, symmetric or asymmetric conjugates). This contribution aims to review the mechanisms of continental lithospheric thinning and types of extensional structures that control the formation of rifted margins. We illustrate, using a two-layer numerical model (one for the crust and one for the mantle), how different modes of lithospheric thinning shape the end-member crustal geometries of rifted margins depending on the initial thermal conditions and extension rates. As already known, the activation of narrow or wide modes of lithospheric thinning depends on the rheological behaviour of the lower crust and its efficiency as a decoupling layer. Morphologies generated by narrow lithospheric thinning modes compare well with Atlantic-type rifted margins (e.g., Iberia-Newfoundland) while wide lithospheric thinning modes better apply to marginal seas characterized by higher initial geothermal gradients (e.g., South China Sea). Finally, we also emphasize that continental lithosphere thinning is depth-dependent, part of which is transient and cannot easily be measured in natural systems.

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Section: Different Modes Of Lithospheric Thinningmentioning

confidence: 99%

Extension of continental lithosphere in rifted margins: a review of thinning mechanisms

Tugend,

Mohn,

Duretz

et al. 2024

Comptes Rendus. Géoscience

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A dynamic rifting model of the Caroline Ridge, West Pacific

Zhang,

Dong,

et al. 2024

Journal of Asian Earth Sciences

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Synrift and post-rift thermal evolution of rifted margins: a re-evaluation of classic models of extension

Pérez-Gussinyé,

Xin,

Cunha

et al. 2024

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The thermal evolution of continental rifted margins is key to understanding margin subsidence and hydrocarbon prospectivity. Observed heat-flow values however, do not always comply with classic rifting models. Here, we use 2D numerical models to investigate the relationship between rifting, sedimentation and thermal history of margins. We find that during the synrift, the basement heat flow and temperature are not only controlled by extension factor, but also by synrift sediment thickness and the evolution of deformation. As this progressively focuses oceanward, the proximal sectors thermally relax, while the distal sectors experience peak temperatures. In the postrift, the lithosphere under the hyperextended margins does not return to its original state, at least for ∼100 Myrs after breakup. Instead, it mimics that of the adjacent oceanic plate, which is thinner than the original continental plate. This results in heat flow increasing oceanward at postrift stages, when classic rifting theory predicts complete thermal relaxation. Our models also predict slightly increased heat flows in the adjacent oceanic crust, potentially extending hydrocarbon plays into distal margins and oceanic crust, previously discarded as immature. Finally, our models indicate that commonly used temperature approximations to calculate heat-flow during rifting, may strongly differ from those occurring in nature. Supplementary material at https://doi.org/10.6084/m9.figshare.c.6986110

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Numerical Modeling of Rifting: An Overviewx

Cited by 3 publications

References 107 publications

Extension of continental lithosphere in rifted margins: a review of thinning mechanisms

Extension of continental lithosphere in rifted margins: a review of thinning mechanisms

A dynamic rifting model of the Caroline Ridge, West Pacific

Synrift and post-rift thermal evolution of rifted margins: a re-evaluation of classic models of extension

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