Tectonics is a Hologram

Coltice, Nicolas

doi:10.1016/b978-0-323-85733-8.00012-3

Cited by 4 publications

(2 citation statements)

References 130 publications

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“…This provides an important avenue to explore in future models, including the role of different temperature-dependent viscosity laws (Stein & Hansen, 2013;Coltice, 2023).…”

Section: Discussionmentioning

confidence: 99%

Generation of evolving plate boundaries and toroidal flow from visco-plastic damage-rheology mantle convection and continents

Becker,

Fuchs

2023

Preprint

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Earth's style of planetary heat transport is characterized by plate tectonics which requires rock strength to be reduced plastically in order to break an otherwise stagnant lithospheric lid, and for rocks to have a memory of past deformation to account for strain localization and the hysteresis implied by geological sutures. Here, we explore $\sim$10$^7$ Rayleigh number, visco-plastic, 3-D global mantle convection with damage. We show that oceanic lithosphere-only models generate strong toroidal-poloidal power ratios and features such as a mix of long-wavelength tectonic motions and smaller-scale, back-arc tectonics driven by subduction. Undulating divergent plate boundaries can evolve to form overlapping spreading centers and microplates, promoted and perhaps stabilized by the effects of damage with long memory. The inclusion of continental rafts enhances heatflux variability and toroidal flow, including net rotation of the lithosphere, to a level seen in plate reconstructions for the Cenozoic. Both the super-continental cycle and local rheological descriptions affect heat transport and tectonic deformation across a range of scales, and we showcase both general tectonic dynamics and regionally applied continental breakup scenarios. Our work points toward avenues for renewed analysis of the typical, mean behavior as well as the evolution of fluctuations in geological and model plate boundary evolution scenarios.

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“…This provides an important avenue to explore in future models, including the role of different temperature-dependent viscosity laws (Stein & Hansen, 2013;Coltice, 2023).…”

Section: Discussionmentioning

confidence: 99%

Generation of evolving plate boundaries and toroidal flow from visco-plastic damage-rheology mantle convection and continents

Becker,

Fuchs

2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Since we do not find any sharper fragmentation even for the higher‐resolution computations we explored, we suggest that this difference might arise because our moderate small‐scale viscosity variations, and the temperature‐dependence of viscosity which is also somewhat smaller than that explored by Langemeyer et al., who also ran at higher convective vigor. Sorting out such differences further provides an important avenue to explore in future models, including in terms of the role of different temperature‐dependent viscosity laws (Coltice, 2023; Stein & Hansen, 2013).…”

Section: Discussionmentioning

confidence: 99%

Generation of Evolving Plate Boundaries and Toroidal Flow From Visco‐Plastic Damage‐Rheology Mantle Convection and Continents

Becker,

Fuchs

2023

Geochem Geophys Geosyst

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Earth's style of planetary heat transport is characterized by plate tectonics which requires rock strength to be reduced plastically in order to break an otherwise stagnant lithospheric lid, and for rocks to have a memory of past deformation to account for strain localization and the hysteresis implied by geological sutures. Here, we explore ∼107 Rayleigh number, visco‐plastic, 3‐D global mantle convection with damage. We show that oceanic lithosphere‐only models generate strong toroidal‐poloidal power ratios and features such as a mix of long‐wavelength tectonic motions and smaller‐scale, back‐arc tectonics driven by downwellings. Undulating divergent plate boundaries can evolve to form overlapping spreading centers and microplates, promoted and perhaps stabilized by the effects of damage with long memory. The inclusion of continental rafts enhances heat flux variability and toroidal flow, including net rotation of the lithosphere, to a level seen in plate reconstructions for the Cenozoic. Both the super‐continental cycle and local rheological descriptions affect heat transport and tectonic deformation across a range of scales, and we showcase both general tectonic dynamics and regionally applied continental breakup scenarios. Our work points toward avenues for renewed analysis of the typical, mean behavior as well as the evolution of fluctuations in geological and model plate boundary evolution scenarios.

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Oblique plate convergence along arcuate trenches on a spherical Earth. An example from the Western Sunda Arc

Guzmán-Speziale

2023

Acta Geophys.

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We propose a new definition of oblique plate convergence. Our model considers arc-trench curvature on a spherical Earth, and defines obliquity as the angle between the direction of plate convergence and the azimuth from the central point along the arc to the center of curvature of the arcuate trench. We also show how this model may be extended to multiple-arc trenches.We apply this definition to the Western Sunda Arc, which has been traditionally considered the prime example of oblique plate convergence, particularly the segment corresponding to Sumatra. We define eight arc-like segments along this arc-trench system. Obliquity angles on these arc-like segments vary from 92° in the northernmost (Burmese) arc to 7° offshore the Sunda strait (between Sumatra and Java). The angle of obliquity offshore Sumatra is 31°, almost within the definition of slightly oblique convergence. Given the low angle of obliquity, partitioning along the Sumatran fault, in the southern portion of the Western Sunda Arc, is difficult to explain by oblique plate convergence alone. We suggest that the entire segment (or forearc) inboard of the Western Sunda Arc be dragged from the Burmese arc, where overriding and subducting plates are completely coupled and oblique plate convergence is high.

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Tectonics is a Hologram

Cited by 4 publications

References 130 publications

Generation of evolving plate boundaries and toroidal flow from visco-plastic damage-rheology mantle convection and continents

Generation of evolving plate boundaries and toroidal flow from visco-plastic damage-rheology mantle convection and continents

Generation of Evolving Plate Boundaries and Toroidal Flow From Visco‐Plastic Damage‐Rheology Mantle Convection and Continents

Oblique plate convergence along arcuate trenches on a spherical Earth. An example from the Western Sunda Arc

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