3D geodynamic-geomorphologic modelling of deformation and exhumation at curved plate boundaries: Implications for the southern Alaskan plate corner

Koptev, Alexander; Nettesheim, Matthias; Falkowski, Sarah; Ehlers, Todd A.

doi:10.1038/s41598-022-17644-8

Cited by 5 publications

(1 citation statement)

References 95 publications

(113 reference statements)

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“…Recent numerical models successfully combined the 3D thermomechanical evolution with surface process models in scenarios with complex three-dimensional geometry (e.g. Koptev et al, 2022).…”

Section: Coupled Geodynamic Numerical Models: Past Present and Future...mentioning

confidence: 99%

Computational Geodynamics of South American Plate: Contributions and Perspectives

Sacek,

Ussami,

Pesce

et al. 2022

Braz J Geophys

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Computational geodynamics is a key tool in Earth Sciences, enabling the simulation of different geodynamic processes at any time scale in Nature or those which cannot be adequately reproduced by analogue modelling in laboratorial conditions. Specifically, the coupling of surface processes of erosion and sedimentation with the internal dynamics of the lithosphere is a complex problem that involves the solution of a set of differential equations that are only adequately solved by numerical models. During the last three decades, different numerical models were developed to explain the importance of the coupling between the surface and internal dynamics of the Earth, both in active margins and in stable tectonic domains, showing how the coupling leads to counter-intuitive results not observed when each process is analyzed separately. One example of this complex coupling is the feedback mechanism between erosion of the landscape and the regional isostatic response of the lithosphere. In this work, we present simple isostatic and flexural elements that highlight the importance of surface processes on the stress and strain pattern in lithospheric plates. Initially, we present a review on the development of computational geodynamics at University of São Paulo. This review is followed by an analysis of the density structure of the Earth and how the high-density contrast at the Earth’s surface creates a major impact on the isostatic equilibrium of the lithosphere when variations on topographic loads are taken into account. Additionally, we show that the wavelength of the denudation of the Earth’s surface due to fluvial dynamics corresponds to the characteristic length scale for flexural bending of the lithosphere, maximizing the flexural stresses in the lithosphere. Finally, we present recent works on the coupling between surface and lithospheric processes and future challenges for the development of computational geodynamics, with possible strategies to solve them.

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“…Recent numerical models successfully combined the 3D thermomechanical evolution with surface process models in scenarios with complex three-dimensional geometry (e.g. Koptev et al, 2022).…”

Section: Coupled Geodynamic Numerical Models: Past Present and Future...mentioning

confidence: 99%

Computational Geodynamics of South American Plate: Contributions and Perspectives

Sacek,

Ussami,

Pesce

et al. 2022

Braz J Geophys

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Coupled surface to deep Earth processes: Perspectives from TOPO-EUROPE with an emphasis on climate- and energy-related societal challenges

Cloetingh

Sternai

Koptev

et al. 2023

Global and Planetary Change

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Control of slab tears and slab flat wedging on volcanism in the Alaska subduction zone

Hu,

Liu,

Wang

et al. 2024

Sci Rep

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Multistage plate subduction plays a crucial role in magmatism; however, the mechanisms by which deep geodynamic processes govern volcanism in the Alaska subduction zone remain controversial. Using numerous travel-time data from several seismic arrays, we constructed high-resolution tomographic models to investigate the velocity structure of the Pacific Plate and Yakutat slab. Our tomographic results revealed high-velocity anomalies in the Pacific Plate and Yakutat slab, while the low-velocity areas within the Pacific Plate were identified as slab tears. We suggest that the Pacific Plate transitioned from oblique subduction along the Aleutian volcano chain to lower-angle subduction beneath the Pacific-Yakutat Plate interaction zone, forming two slab tears that enhance hot asthenosphere materials upwelling. The partial melting of the mantle wedge induced by Pacific slab dehydration and the concurrent upwelling of mantle materials jointly drove volcanism in the transition zone. Conversely, the flat subduction of the Yakutat slab into the mantle wedge overlying the Pacific slab effectively hindered the upwelling of hot hybrid materials, cooling the Pacific mantle wedge. These results offer a new perspective on the influence of slab dynamics on volcanic and magmatic processes in the region and represent an advancement in our understanding compared to previous studies, which did not resolve the tears within the slab or their geodynamic implications at this level of detail. Supplementary Information The online version contains supplementary material available at 10.1038/s41598-024-76595-4.

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3D geodynamic-geomorphologic modelling of deformation and exhumation at curved plate boundaries: Implications for the southern Alaskan plate corner

Cited by 5 publications

References 95 publications

Computational Geodynamics of South American Plate: Contributions and Perspectives

Computational Geodynamics of South American Plate: Contributions and Perspectives

Coupled surface to deep Earth processes: Perspectives from TOPO-EUROPE with an emphasis on climate- and energy-related societal challenges

Control of slab tears and slab flat wedging on volcanism in the Alaska subduction zone

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