Controls of subducting slab dip and age on the extensional versus compressional deformation in the overriding plate

Dasgupta, Ritabrata; Mandal, Nibir; Lee, Changyeol

doi:10.1016/j.tecto.2020.228716

Cited by 14 publications

(8 citation statements)

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“…The models presented in the preceding section were run with a constant density difference (Δρ) between the subducting slab and the ambient mantle. However, the negative buoyancy of subducting slabs can vary with the lithospheric age, as reported in Frontiers in Earth Science frontiersin.org the existing literature (Cruciani et al, 2005;Dasgupta et al, 2021a), where the slabs become increasingly denser with age. We thus ran additional simulations to test the possible effects of increasing slab buoyancy on the trench topography by varying Δρ in a non-dimensional form:…”

Section: Discussion Effects Of Slab Buoyancymentioning

confidence: 85%

“…Many earlier studies have used this CFD code to deal with different geodynamic problems, such as mantle convection (He, 2014), magma upwelling (Shahraki and Schmeling, 2012), Rayleigh-Taylor instabilities (Ruffino et al, 2016), mid-ocean ridge development (Montési and Behn, 2007), wedge melting (Lee and Kim, 2021), and plate subduction (Carminati and Petricca, 2010;Rodriguez-Gonzalez et al, 2012). To track the evolving surface of model surface topography, we implemented an arbitrary Lagrangian Eulerian (ALE) scheme, the detailed mathematical formulation of which can be seen in earlier publications Mandal, 2022 andDasgupta et al,2021a).…”

Section: Governing Equationsmentioning

confidence: 99%

“…We started our model run with a proto-subduction slab dip of 30 °(measured up to a depth of 300 km), as used in much earlier modeling (François et al, 2014;Holt et al, 2015;Jadamec, 2016), imposing a free-slip boundary condition at the bottom and vertical boundaries. In a 20 Myr model simulation, we applied a horizontal velocity (2 cm/yr) at the rear slab boundaries for an initial run time of 3 Myr, and then allowed the proto-subduction to evolve spontaneously under the slab-pull action (Dasgupta et al, 2021a). The simulation run time was chosen to be relatively short (20 Myr) because the subduction topography generally tends to stabilize on a time scale <8 Myr (Zhong and Zuber, 2000;Dasgupta and Mandal, 2018;Dasgupta and Mandal, 2022).…”

Section: Model Setupmentioning

confidence: 99%

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Trench topography in subduction zones: A reflection of the plate decoupling depth

Dasgupta

Mandal

2022

Front. Earth Sci.

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Subduction of lithospheric plates produces narrow, linear troughs (trench) in front of the overriding plates at the convergent boundaries. The trenches show a wide variation in their topographic characteristics, such as width, vertical depth, and bounding surface slopes. Benchmarking their controlling factors is thus a crucial step in the analysis of trench morphology. This article identifies the mechanical coupling between the subducting and overriding plates as a leading factor in modulating the topographic evolution of a trench. The maximum depth of decoupling (MDD) is used to express the degree of decoupling at the plate interface. We simulate subduction zones in computational fluid dynamic (CFD) models to show the topographic elements (maximum negative relative relief: D; fore- and hinter-wall slopes: θF and θH; opening width: W) of trenches as a function of the MDD within a range of 30–120 km. Both D and θ strongly depend on the MDD, whereas W is found to be relatively less sensitive to the MDD, implying that the narrow/broad width of a trench can change little with the plate decoupling factor. We also show that the MDD critically controls the fore-arc stress fields of a trench, switching a compressive to tensile stress transition with increasing MDD. This study finally validates the model findings with well-constrained natural trench topography.

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Section: Discussion Effects Of Slab Buoyancymentioning

confidence: 85%

Section: Governing Equationsmentioning

confidence: 99%

Section: Model Setupmentioning

confidence: 99%

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Trench topography in subduction zones: A reflection of the plate decoupling depth

Dasgupta

Mandal

2022

Front. Earth Sci.

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“…(3) Parameter estimation of ARIMA model. ARIMA(p, d, q) becomes a stationary sequence after d a stationary sequence [36,37], which is equivalent to the ARMA model and only needs to be solved by the method of parameter estimation a p = (φ 1 , φ 2 , . .…”

Section: Solving Steps Of Arimamentioning

confidence: 99%

ARIMA-FEM Method with Prediction Function to Solve the Stress–Strain of Perforated Elastic Metal Plates

Chen

Dai

Zheng

2022

Metals

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Stress analysis and deformation prediction have always been the focuses of the field of mechanics. The accurate force prediction in plate deformation plays important role in the production, processing and performance analysis of materials. In this paper, we propose an ARIMA-FEM method, which can be used to solve some mechanical problems of 2D porous elastic plate. We have given a detailed theory and solving steps of ARIMA-FEM. In addition, three numerical examples are given to predict the stress–strain of thin porous elastic metal plates. This article uses CST, LST and Q4 elements to discrete the rectangular plates, square plates and circle plates with holes. As for variable force prediction, this paper compared with linear regression, nonlinear regression and neural network prediction, and the results show that the ARIMA method has a higher prediction accuracy. Furthermore, we calculate the numerical solution at four mesh scales, and the numerical convergence is consistent with the theoretical convergence, which also shows the effectiveness of our method. The image smoothing algorithm is applied to keep edge information with high resolution, which can more concisely describe the plate internal changes. Finally, the application scope of ARIMA-FEM, model expansion, superconvergence analysis and other issues have been given enlightening views in the discussion section. In fact, this algorithm combined statistics and mechanics. It also reflects the knowledge integration of interdisciplinary and uses it better to serve practical applications.

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“…In the present model we have considered a simple steady underthrust geometry, without any slab steepening, break-off, or flattening in the experimental setup. Recent numerical models of Dasgupta et al (2021) allow us to stipulate that unsteady slab-dip (i.e., steepening or flattening) would be an additional factor in determining the contractional versus extensional tectonics of the overriding plate. Thus, this issue opens up a further scope for advancing the present Tibet model with an unsteady slab underthrusting.…”

Section: Limitations and Future Scopesmentioning

confidence: 99%

Impact of Decelerating India‐Asia Convergence on the Crustal Flow Kinematics in Tibet: An Insight From Scaled Laboratory Modeling

Maiti

Roy

Sen

et al. 2021

Geochem Geophys Geosyst

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Controls of subducting slab dip and age on the extensional versus compressional deformation in the overriding plate

Cited by 14 publications

References 64 publications

Trench topography in subduction zones: A reflection of the plate decoupling depth

Trench topography in subduction zones: A reflection of the plate decoupling depth

ARIMA-FEM Method with Prediction Function to Solve the Stress–Strain of Perforated Elastic Metal Plates

Impact of Decelerating India‐Asia Convergence on the Crustal Flow Kinematics in Tibet: An Insight From Scaled Laboratory Modeling

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