4.6 Review

Ocean-continent subduction cannot be initiated without preceding intra-oceanic subduction!

Related references

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Article Geochemistry & Geophysics

Polarity-reversal subduction zone initiation triggered by buoyant plateau obstruction

J. Almeida et al.

Summary: The worldwide youthful oceanic lithosphere suggests a global recycling through the formation of new subduction zones. The initiation processes of subduction zones remain difficult to explain in many cases, but numerical models can help understand the dynamics governing this process. The study provides new insights on the geodynamic conditions driving subduction zone initiation and their compliance with natural examples.

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Breaking subductions' fourth wall

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Summary: A 4D evolution model of the Puysegur margin in New Zealand suggests that subduction zone formation may be driven both horizontally and vertically, indicating the need for an expanded classification of subduction initiation.

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Stress transition from horizontal to vertical forces during subduction initiation

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Summary: This study reveals the spatial-temporal evolution of stress during subduction initiation and suggests an accelerated transition to self-sustaining subduction. In contrast to previous hypotheses, the study proposes a four-dimensional evolution where horizontal forces initially dominate but vertical forces accelerate over time and facilitate the development of self-sustaining subduction.

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Horizontal Force Required for Subduction Initiation at Passive Margins With Constraints From Slab Detachment

Lorenzo G. Candioti et al.

Summary: This study focuses on the processes causing subduction zone initiation, with results showing that thermal softening is the main controlling factor and a minimum horizontal force of about 14 TN m(-1) is required for subduction zone initiation.

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Subduction initiation triggered by collision: A review based on examples and models

Gaoxue Yang

Summary: This study reviews the mechanisms of subduction initiation, including subduction polarity reversal and subduction transference, and highlights the importance of weak zones and driving forces. It is found that subduction initiation typically occurs about 10 million years after collision, with subduction transference occurring later in some oceans. Further research using numerical models moving from 2D to 3D is needed to better simulate the subduction initiation process, while the role of weak rheology in subduction initiation requires more investigation using natural observations and numerical modeling.

EARTH-SCIENCE REVIEWS (2022)

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Self-replicating subduction zone initiation by polarity reversal

Jaime Almeida et al.

Summary: Previous studies suggest that new subduction zones are unlikely to form in the interior of a pristine ocean, but are more likely to be formed from pre-existing subduction zones. 3D numerical modeling shows that new subduction zones can form in a self-replicating manner from previous ones when certain conditions are met, such as the presence of old subducting plates and narrow plateaus.

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Subduction initiation from the earliest stages to self-sustained subduction: Insights from the analysis of 70 Cenozoic sites

Serge Lallemand et al.

Summary: The study explores subduction initiation during the Cenozoic and finds that new subduction zones regularly form with a success rate of over 70%, mainly at transition areas between ocean and continent, plateau, or volcanic arc. The success of the process relies on lithospheric forces, especially in the early stages.

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Evolution and demise of passive margins through grain mixing and damage

David Bercovici et al.

Summary: The initiation of subduction, or the sinking of cold lithospheric plates into the mantle, is a key mystery in understanding plate tectonics on Earth. The weakening of passive margins, through mechanisms such as spontaneous grain damage and mixing between mineral phases, can lead to the facilitation of passive margin collapse. Over approximately 100 million years, bands of mixing and weakening can develop in lithospheric rocks, resulting in anisotropic viscosity that is strong to lateral forces but weak to bending and sinking.

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Passive margin inversion controlled by stability of the mantle lithosphere

A. Auzemery et al.

Summary: This study investigates the deformation of passive continental margins by simulating different mantle viscosities and convergence rates, finding distinct characteristics of passive margin deformation under different mantle lithospheric strength conditions.

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Plume-Induced Subduction Initiation: Revisiting Models and Observations

Marzieh Baes et al.

Summary: Subduction initiation induced by a hot and buoyant mantle plume head is a unique mechanism that does not require pre-existing weak zones or other forces. Studies have focused on natural examples, numerical and physical modeling, and geological-geochemical research to investigate the onset of a new subduction zone. The interaction between a mantle plume and lithosphere has long been important, and modeling studies provide valuable information on the spatial and temporal variations in lithospheric deformation caused by these interactions.

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Differentiating induced versus spontaneous subduction initiation using thermomechanical models and metamorphic soles

Xin Zhou et al.

Summary: Although spontaneous subduction initiation is more favorable for creating high-temperature conditions, geological observations indicate that the majority of metamorphic soles formed during induced subduction initiation involving a young overriding plate.

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Rapid subduction initiation and magmatism in the Western Pacific driven by internal vertical forces

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Oceanic crust recycling controlled by weakening at slab edges

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