Subduction initiation at an oceanic transform fault experiencing compression: Role of the fault structure and of the brittle-ductile transition depth

Arcay, Diane; Abecassis, Sarah; Lallemand, Serge

doi:10.1016/j.epsl.2023.118272

Cited by 1 publication

(2 citation statements)

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“…In this manuscript we refer to the transform fault zone as the weak zone (WZ) (Figure 3). Similar setup has been used in previous numerical studies (e.g., Gerya et al, 2008;Zhou and Wada, 2022;Arcay et al, 2023) and it is in agreement with geochemical constraints (e.g., Li et al, 2019;Ishizuka et al, 2020;Reagan et al, 2023). The overall shape and dimension of the WZ in our model setup is supported by natural observations (e.g., Hensen et al, 2019;Gregory et al, 2021).…”

Section: Initial Model Setupsupporting

confidence: 88%

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Magmatic fingerprints of subduction initiation and mature subduction: numerical modelling and observations from the Izu-Bonin-Mariana system

Ritter,

Balázs,

Ribeiro

et al. 2024

Front. Earth Sci.

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Understanding the formation of new subduction zones is important because they have been proposed as the main driving mechanism for plate tectonics and they are crucial for geochemical cycles on Earth. However, the conditions needed to facilitate subduction zone initiation and the associated magmatic evolution are still poorly understood. Using a natural case study, we conducted a series of high-resolution 2D petrological-thermomechanical (i2VIS) subduction models assuming visco-plastic rheology. We aim to model the initiation and early stage of an intra-oceanic subduction zone connected to the gravitational collapse of a weak transform zone and compare it to the natural example of the Izu-Bonin-Mariana subduction zone. We also analysed the influence of low convergence rates on magmatic evolution. We propose a viable transition from initiation to mature subduction zone divided into distinct stages that include initiation by gravitational collapse of the subducting slab, development of a near-trench spreading centre, gradual build-up of asthenospheric mantle return flow, and maturation of a volcanic arc. We further show that mantle flow variations and shear instabilities, producing thermal perturbations and depleted interlayers, influence the temporal and spatial distribution of asthenospheric mantle composition and fertility in the mantle wedge. Our modelling results are in good agreement with geological and geochemical observations of the early stages of the Izu-Bonin-Mariana subduction zone.

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Section: Initial Model Setupsupporting

confidence: 88%

“…The process of spontaneous SI in nature is debated (e.g., Stern, 2004;Stern et al, 2012;Arcay et al, 2020;Maunder et al, 2020;Arcay et al, 2023). Our models indicate that an initial stage of slow plate convergence supports SI.…”

Section: Comparison With the Incipient Izu-bonin-mariana Subduction Zonementioning

confidence: 73%

Magmatic fingerprints of subduction initiation and mature subduction: numerical modelling and observations from the Izu-Bonin-Mariana system

Ritter,

Balázs,

Ribeiro

et al. 2024

Front. Earth Sci.

View full text Add to dashboard Cite

show abstract

Subduction initiation at an oceanic transform fault experiencing compression: Role of the fault structure and of the brittle-ductile transition depth

Cited by 1 publication

References 49 publications

Magmatic fingerprints of subduction initiation and mature subduction: numerical modelling and observations from the Izu-Bonin-Mariana system

Magmatic fingerprints of subduction initiation and mature subduction: numerical modelling and observations from the Izu-Bonin-Mariana system

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