Numerical simulations of subduction, relamination and accretion of magmatic arcs – implications for continent-ocean convergent margins

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169561" target="_blank" >RIV/00025798:_____/25:10169561 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.epsl.2024.119192" target="_blank" >https://doi.org/10.1016/j.epsl.2024.119192</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.epsl.2024.119192" target="_blank" >10.1016/j.epsl.2024.119192</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Numerical simulations of subduction, relamination and accretion of magmatic arcs – implications for continent-ocean convergent margins

Popis výsledku v původním jazyce

Magmatic arcs above subduction zones are places where new felsic crustal material is created. On the other hand, arcs, together with warm back-arc regions, are zones of weakness that focus deformation. Here we investigate the final phase of oceanic subduction and the subsequent fate of magmatic arcs, namely their deformation, accretion to the continental margin, or subduction into the mantle. We use two-dimensional thermo-mechanical numerical models that mimic the closing of the continent-arc-back-arc system, where the arc and back-arc are placed at an oceanic plate. We distinguish two contrasting styles of evolution. The first one (subduction transference) is characterized by formation of a new plate boundary in the weak back-arc lithosphere and subduction of the arc at this boundary. During this process, a part of the arc crust may be accreted to the continental margin, but a significant portion of the arc is dragged into the mantle. In the mantle, the upper buoyant part of the arc crust separates from the rest of the arc lithosphere and flows beneath the lithospheric mantle of the upper plate - it is relaminated to the upper plate. The second contrasting evolutionary style (polarity reversal) is arc accretion and the development of a new subduction zone underneath the arc. The new subduction has an opposite polarity than the original oceanic subduction. Arc accretion and subduction polarity reversal occur when the arc is very weak due to a high temperature or weak lithologies at its base.

Název v anglickém jazyce

Numerical simulations of subduction, relamination and accretion of magmatic arcs – implications for continent-ocean convergent margins

Popis výsledku anglicky

Magmatic arcs above subduction zones are places where new felsic crustal material is created. On the other hand, arcs, together with warm back-arc regions, are zones of weakness that focus deformation. Here we investigate the final phase of oceanic subduction and the subsequent fate of magmatic arcs, namely their deformation, accretion to the continental margin, or subduction into the mantle. We use two-dimensional thermo-mechanical numerical models that mimic the closing of the continent-arc-back-arc system, where the arc and back-arc are placed at an oceanic plate. We distinguish two contrasting styles of evolution. The first one (subduction transference) is characterized by formation of a new plate boundary in the weak back-arc lithosphere and subduction of the arc at this boundary. During this process, a part of the arc crust may be accreted to the continental margin, but a significant portion of the arc is dragged into the mantle. In the mantle, the upper buoyant part of the arc crust separates from the rest of the arc lithosphere and flows beneath the lithospheric mantle of the upper plate - it is relaminated to the upper plate. The second contrasting evolutionary style (polarity reversal) is arc accretion and the development of a new subduction zone underneath the arc. The new subduction has an opposite polarity than the original oceanic subduction. Arc accretion and subduction polarity reversal occur when the arc is very weak due to a high temperature or weak lithologies at its base.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GX19-27682X" target="_blank" >GX19-27682X: Hlavní mechanismy periferálního kontinentálního růstu během superkontinentálního cyklu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2025

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

EARTH AND PLANETARY SCIENCE LETTERS

ISSN

0012-821X

e-ISSN

1385-013X

Svazek periodika

652

Číslo periodika v rámci svazku

119192

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

12

Strana od-do

nestránkováno

Kód UT WoS článku

001412489300001

EID výsledku v databázi Scopus

2-s2.0-85213285360