Terrane geodynamics: Evolution on the subduction conveyor from pre-collision to post-collision and implications on Tethyan orogeny

Gün, Erkan; Pysklywec, R. N.; Gogus, O.; Topuz, Gültekın

doi:10.1016/j.gr.2021.09.018

Cited by 5 publications

(4 citation statements)

References 90 publications

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“…The data—the outputs of the numerical experiments—that support the findings of this study can be accessed at Borealis (Gün et al., 2024). The SOPALE (Fullsack, 1995) modeling code is not an open‐source code and may be accessed by contacting the developer Philippe Fullsack (mailto:Philippe.Fullsack@dal.ca), Dalhousie University.…”

Section: Data Availability Statementmentioning

confidence: 61%

“…Ocean plateaux are formed by large basaltic extrusions on the ocean floor and originate as a result of mantle plumes (Richards et al., 1989), seafloor spreading (Sager et al., 2019), and lithospheric extension (Foulger, 2007). A key geodynamic characteristic shared among these plateaux compared to nominal surrounding ocean lithosphere is a thicker crust, which locally perturbs the geotherm and reduces the bulk strength of the plateau regions (Gün et al., 2022). We explore the available data from contemporary oceanic plateaux in the Pacific—Ontong Java, Shatsky, Hess, and Manihiki plateaux—that reveal seismic and petrologic evidence for major episodes of extensional deformation in these zones, dating from after their emplacement (onto or into oceanic lithosphere) and prior to arrival at a subduction trench.…”

Section: Introductionmentioning

confidence: 99%

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Syn‐Drift Plate Tectonics

Gün,

Pysklywec,

Topuz

et al. 2024

Geophysical Research Letters

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The paradigm of plate tectonics holds that ocean plates are rigid during drift and only experience tectonic deformation at subduction zones, but new findings from the Pacific challenge this idea. Geological and geophysical evidence from the Ontong Java, Shatsky, Hess, and Manihiki oceanic plateaux indicates that extensional deformation during plate drift is a widespread phenomenon across the Pacific plate. These anomalously thick oceanic plateaux are weaker regions of the ocean lithosphere and more prone to tectonic deformation. Numerical geodynamic models demonstrate that a slab pull force from distant subduction plate boundaries can be effectively transmitted to oceanic plateaux through strong ocean lithosphere and cause substantial extension during plate drift. Our findings reveal that a wide expanse of the Pacific has experienced syn‐drift plate tectonics linked to pull from the western Pacific subduction factory.

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Section: Data Availability Statementmentioning

confidence: 61%

Section: Introductionmentioning

confidence: 99%

Syn‐Drift Plate Tectonics

Gün,

Pysklywec,

Topuz

et al. 2024

Geophysical Research Letters

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“…These two models with L = 500 and 400 km represent two transitional regimes, that is, continental re‐subduction after slow sinking and subduction cessation after slow sinking. Besides, as the subducting plate slowly sinks, these two models with L = 500 and 400 km exert a strong viscous drag on the overlying plate, generating an ablation subduction style (Bodur et al., 2018; Göğüş, 2015; Gün et al., 2022) (Figures 7c and 7d).…”

Section: Resultsmentioning

confidence: 99%

Continental Deep Subduction Versus Subduction Cessation: The Fate of Collisional Orogens

Wang,

Li,

Huangfu

2023

Tectonics

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The contrasting fates of collisional orogens, i.e., continental deep subduction or subduction cessation, are widely recognized by petrological, paleomagnetic and geophysical observations. However, the mechanisms of such different collisional modes, especially the dynamics of continental deep subduction, are controversial. In this study, we integrate the phase transition‐induced density evolution into a thermo‐mechanical numerical model. Combing the systematic petrological‐thermo‐mechanical models with force balance analyses, we find that the high metamorphic transformation degree, mildly depleted mantle composition of the subcontinental lithosphere, and a long preceding oceanic slab, increase the driving force for continental deep subduction. Additionally, the rheologically weak continental crust and asthenospheric mantle decrease the resistance force and promote deep subduction. Otherwise, the continental subduction cessation mode is favored. The calculations of slab negative buoyancy indicate that the phase transition‐induced metamorphic densification of the subducted continental crust and the mildly to moderately depleted lithospheric mantle can provide a great slab pull force to sustain the continued continental deep subduction; however, the positive buoyancy of highly depleted Archean lithospheric mantle impedes deep subduction and causes subduction cessation. Based on systematic numerical models, we also evaluate the crustal mass balance or deficit in continental collisional system, which indicates that ∼12%‐47% of pre‐collisional felsic crust could be subducted deeply with the sinking slab in the regime of continental deep subduction. In contrast, the recycled felsic crust is negligible in the regime of subduction cessation. Thus, the different modes of continental collision play a crucial role in the global crustal recycling and related mantle heterogeneities.This article is protected by copyright. All rights reserved.

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“…Although there exists a variety of isolated continents worldwide (Mortimer, 2004), the processes involved in the generation and structure of these fragments during continent breakup are unclear (Dewey and Burke, 1974). Previous work on terranes mainly focused on the provenance from (or accretion to) a continental body (e.g., Coney et al, 1980) or drift mechanics (Gün et al, 2021(Gün et al, , 2022, rather than the mechanisms by which the isolation occurs.…”

Section: Introductionmentioning

confidence: 99%

Stranding continental crustal fragments during continent breakup: Mantle suture reactivation in the Nain Province of Eastern Canada

Heron

Peace

McCaffrey

et al. 2023

Geology

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Earth’s continental crust has evolved through a series of supercontinent cycles, resulting in a patchwork of Archean cores surrounded by terranes, fragments, and slivers of younger crustal additions. However, the dispersal (and/or stranding) of continental fragments during breakup is not well understood. Inherited structures from previous tectonic activity may explain the generation of continental terranes by controlling first-order deformation during rifting. Here, we explored the influence of lithospheric deformation related to ancient orogenesis, focusing on the impact of the Torngat orogen in the genesis of the Nain Province continental fragment in Eastern Canada. We present three-dimensional continental extension models in the presence of an inherited lithospheric structure and show that a narrow continental terrane could be separated and stranded by deep lithospheric scarring. The results show that continental terranes formed by this method would be limited to a width of 100–150 km, imposed by tectonic conditions during continental suturing. The findings have broad implications, demonstrating an original theory on the fundamental geologic problem of terrane generation and continent breakup.

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Terrane geodynamics: Evolution on the subduction conveyor from pre-collision to post-collision and implications on Tethyan orogeny

Cited by 5 publications

References 90 publications

Syn‐Drift Plate Tectonics

Syn‐Drift Plate Tectonics

Continental Deep Subduction Versus Subduction Cessation: The Fate of Collisional Orogens

Stranding continental crustal fragments during continent breakup: Mantle suture reactivation in the Nain Province of Eastern Canada

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