Accretion of oceanic plateaus at continental margins: Numerical modeling

Tao, Jianli; Dai, Liming; Lou, Da; Li, Zhong‐Hai; Zhou, Shuhui; Liu, Ze; Li, Sanzhong; Huang, Dong; Lan, Haoyuan; Wang, Liangliang; Li, Fakun

doi:10.1016/j.gr.2019.11.015

Cited by 31 publications

(42 citation statements)

References 66 publications

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“…Previous studies suggest that terrane accretion and the overriding plate's deformation can be complicated by many factors. For example, whether the exotic buoyant material is accreted to the continental margin or subducted to the mantle is influenced by the thickness and rheology of the continental margin, the size, density, and rheology of the accreted buoyant block and the age and rheology of the subducting oceanic lithosphere (Tao et al, 2020; Tetreault & Buiter, 2012). Future geological investigations on the spatial and temporal distributions of these accretionary events and the physical properties of the accreted terranes along the East Asian margin will help us to build more realistic 3‐D slab subduction models and improve our understandings of the Mesozoic Northeast Asian tectonic evolution.…”

Section: Discussionmentioning

confidence: 99%

“…Tectonics the size, density, and rheology of the accreted buoyant block and the age and rheology of the subducting oceanic lithosphere (Tao et al, 2020;Tetreault & Buiter, 2012). Future geological investigations on the spatial and temporal distributions of these accretionary events and the physical properties of the accreted terranes along the East Asian margin will help us to build more realistic 3-D slab subduction models and improve our understandings of the Mesozoic Northeast Asian tectonic evolution.…”

Section: 1029/2020tc006350mentioning

confidence: 99%

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Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

et al. 2020

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Tectonics in North China and adjacent areas were dominated by the Pacific Plate subduction since the Jurassic. Although the extension-dominated tectonics in North China since the Early Cretaceous can be well explained by the Pacific Plate subduction, it is still not well understood why North China and adjacent areas underwent intense compression (Yanshanian orogeny) during the Late Jurassic and why these regions rapidly switched to extension-dominated tectonics during the Early Cretaceous. Plate reconstructions suggest that East Asia was moving rapidly in the direction opposite the trench during the Jurassic when North China was undergoing strong compressional deformation. This relationship between back-arc deformation and overriding plate's motion seems to contradict previous compilations and geodynamic models. We suggest that large-scale mantle convection and exotic terrane accretions along the East Asian margin have jointly contributed to the Yanshanian orogeny across North China during the Jurassic. We verify this hypothesis with numerical geodynamic models. Our numerical experiments also suggest that large-scale downwelling mantle flow beneath Asia has promoted continued subduction beneath the Asian margin despite the subduction was often punctuated by collisional and accretionary events.

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Section: Discussionmentioning

confidence: 99%

Section: 1029/2020tc006350mentioning

confidence: 99%

Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

et al. 2020

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“…Previous studies suggested that the subduction of oceanic plateaus may contribute to flat‐slab subduction (e.g., Livaccari et al, 1981; Z.‐X. Li & Li, 2007; Meng et al, 2012; Zhu et al, 2013; Tao et al, 2020). Thus, an oceanic plateau is set within the oceanic plate.…”

Section: Numerical Model Designmentioning

confidence: 99%

Slab Rollback Versus Delamination: Contrasting Fates of Flat‐Slab Subduction and Implications for South China Evolution in the Mesozoic

et al. 2020

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Growing evidence supports that the widely developed Mesozoic folds and magmatism in the South China Block are attributed to the flat-slab subduction, followed by slab steepening, of the Paleo-Pacific Plate (PPP). However, the dynamics of the transition from flatto steep-slab subduction, as well as the relationship between tectonic processes and surface deformation and magmatic events, are poorly constrained. Using a 2-D thermomechanical numerical model, we systematically investigate the effects of slab rollback or delamination following the eclogitization of a subducted oceanic plateau on the surficial topography, structural deformation, and magmatism. Our results indicate that the subduction of an oceanic plateau drives flat-slab subduction, which further leads to the development of a wide thrust fault zone, an uplifted and magmatically active foreland, and the foreland basin subsidence. This model is further complicated by the transition from flatto steep-slab subduction through slab rollback or delamination which is controlled by the subduction rate and the timing of oceanic plateau eclogitization. The comparisons between our numerical results and the geological data from South China reveal that the slab delamination model reproduces the regional evolution of the Mesozoic South China. Based on our models, we suggest that the eclogitization during flat-slab subduction is not instantaneous, which is instead at least 18 Myr after the oceanic plateau reaches the ideal conditions of phase change.

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“…The previous correlated numerical studies are generally focusing on two points. One is the subduction of anomalous blocks within an oceanic plate, including the island arc, oceanic plateaus, or continental fragments, which is generally focusing on the resulting flat subduction (Mason et al, 2010;van Hunen et al, 2002van Hunen et al, , 2004 or the contrasting modes of accretion (e.g., Selzer et al, 2008;Tao et al, 2020;Tetreault & Buiter, 2012;Vogt & Gerya, 2014;Yang et al, 2018). Notably, a "trench jump" after collision is predicted in some of the models (Tetreault & Buiter, 2012;Vogt & Gerya, 2014;Yang et al, 2018), which is however caused by the detachment of weak and buoyant crust of the accreting terrane, rather than initiating a new subduction zone in the neighboring oceanic plate.…”

Section: Introductionmentioning

confidence: 99%

Subduction Initiation During Collision‐Induced Subduction Transference: Numerical Modeling and Implications for the Tethyan Evolution

Zhong

2020

JGR Solid Earth

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The collision‐induced subduction transference is a composite dynamic process including both the terrane collision/accretion and the subduction initiation (SI) at the neighboring passive margin. This process occurred repeatedly during the evolution of Tethyan systems, with multiple ribbon‐like continents or microcontinents drifting from Gondwana in the southern hemisphere and accreting to the Eurasian continent since Paleozoic. In the previous numerical studies, the dynamics of terrane collision and induced SI are investigated individually, which however need to be integrated to study the controlling factors and time scales of collision‐induced subduction transference. Systematic numerical models are conducted with variable properties of converging plates and different boundary conditions. The model results indicate that the forced convergence, rather than pure free subduction, is required to trigger and sustain the SI at the neighboring passive margin after terrane collision. In addition, a weak passive margin can significantly promote the occurrence of SI, by decreasing the required boundary force to reasonable value of plate tectonics. The lengths of subducted oceanic slab and accreting terrane play secondary roles in the occurrence of SI after collision. Under the favorable conditions of collision‐induced subduction transference, the time required for SI after collision is generally short within 10 Myr, which is consistent with the general geological records of Cimmerian collision and the following Neo‐Tethyan SI. In contrast, the stable Indian passive margin and absence of SI in the present Indian Ocean may be due to the low convergent force and/or the lack of proper weak zones, which remains an open question.

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Accretion of oceanic plateaus at continental margins: Numerical modeling

Cited by 31 publications

References 66 publications

Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

Yanshanian Orogeny During North China's Drifting Away From the Trench: Implications of Numerical Models

Slab Rollback Versus Delamination: Contrasting Fates of Flat‐Slab Subduction and Implications for South China Evolution in the Mesozoic

Subduction Initiation During Collision‐Induced Subduction Transference: Numerical Modeling and Implications for the Tethyan Evolution

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