6533b82ffe1ef96bd1295ccd
RESEARCH PRODUCT
Polarity-reversal subduction zone initiation triggered by buoyant plateau obstruction
Wouter P. SchellartNicolas RielFilipe RosasJaime AlmeidaJoão C. DuarteJoão C. Duartesubject
Polarity reversalgeographyPlateaugeography.geographical_feature_categorySubductionnumerical modellingpolarity-reversalNumerical modelsinternal force balanceGeophysicsSpace and Planetary ScienceGeochemistry and PetrologyLithosphereoceanic plateausubduction zone initiationEarth and Planetary Sciences (miscellaneous)Internal forcesPetrologysubduction zonesGeologydescription
Abstract Oceanic lithosphere worldwide is younger than ca. 200 Myr, suggesting that it must have been globally recycled by the recurrent formation of new subduction zones since the existence of subduction on Earth. However, postulated subduction zone initiation processes remain difficult to explain in many cases, and the specific geodynamic conditions under which these might occur are still largely unknown. We here use numerical models driven by the internal force balance of a subduction system to better understand the (geo)dynamics governing (intra-oceanic) polarity-reversal subduction zone initiation. This initiation mode assumes that the birth of a new subduction zone could be triggered by buoyant plateau-obstruction of a pre-existent one dipping in the opposite direction. Our work provides a new insight on the key geodynamic conditions governing this type of subduction zone initiation and discusses their general compliance with known natural examples.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2022-01-01 | Earth and Planetary Science Letters |