Evolution of the geological structure due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations Article Swipe

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Ayumu Miyakawa , Atsushi Noda , Hiroaki Koge ·

YOU? · · 2023 · Open Access · · DOI: https://doi.org/10.5194/egusphere-egu23-4618

We propose a conceptual geological model for the collision of multiple basement topographic highs (BTHs; e.g., seamounts, ridges, and horsts) with a forearc accretionary wedge. Even though there are many BTHs on an oceanic plate, there are few examples of modeling the collision of multiple BTHs. We conducted numerical simulations using the discrete element method to examine the effects of three BTH collisions with forearcs. The typical geological structure associated with a BTH collision was reproduced during the collision of the first BTH, and multiple BTH collisions create a cycle of formation of BTH collisional structures. Each BTH forces the basal décollement to move up to the roof décollement, and the roof décollement becomes inactive after the passage of the BTH, and then the décollement moves down to the base. As the active décollement position changes, the sequences of underthrust sediments and uplifted imbricate thrusts are sandwiched between the décollements and incorporated into the wedge. The distinctive structural features observed in our model are comparable to the large faults in the Kumano transect of the Nankai Trough, Japan, where a splay fault branches from the plate boundary and there are old and active décollements.

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Forearc Geology Décollement Accretionary wedge Wedge (geometry) Seismology Seamount Collision Subduction Tectonics Paleontology Geometry Mathematics Computer security Computer science

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Type: preprint
Language: en
Landing Page: https://doi.org/10.5194/egusphere-egu23-4618
OA Status: gold
Related Works: 10
OpenAlex ID: https://openalex.org/W4321489397

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DOI: https://doi.org/10.5194/egusphere-egu23-4618

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Title: Evolution of the geological structure due to the collision of multiple basement topographic highs in a forearc accretionary wedge: insights from numerical simulations

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Type: preprint

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Language: en

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Publication year: 2023

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Publication date: 2023-02-22

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Authors: Ayumu Miyakawa, Atsushi Noda, Hiroaki Koge

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Landing page: https://doi.org/10.5194/egusphere-egu23-4618

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Concepts: Forearc, Geology, Décollement, Accretionary wedge, Wedge (geometry), Seismology, Seamount, Collision, Subduction, Tectonics, Paleontology, Geometry, Mathematics, Computer security, Computer science

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