Ridge Subduction: Unraveling the Consequences Linked to a Slab Window Development Beneath South America at the Chile Triple Junction

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dc.contributor.authorSanhueza, Jorge
dc.contributor.authorYanez, Gonzalo
dc.contributor.authorBuck, W. Roger
dc.contributor.authorVargas, Jaime Araya
dc.contributor.authorVeloso, Eugenio
dc.date.accessioned2025-01-20T20:06:03Z
dc.date.available2025-01-20T20:06:03Z
dc.date.issued2023
dc.description.abstractThe subduction of an active spreading center generates a clear signature in the temporal evolution of subduction zones. It disrupts the typical arc-type magmatism and intraplate seismicity, enhances the emplacement of backarc plateau lava and profoundly change the tectonics and topographic relief. These distinct observations are commonly linked to a slab window opening and mantle upwelling. The Chile Triple Junction provides the ideal setup to study the mid-ocean ridge subduction process where both sides of the spreading center continue to subduct. Here, we use 2-D numerical petrological-thermomechanical modeling to focus on transient geodynamic processes caused by mid-ocean ridge subduction. Model results show slab separation along the ridge axis with the opening of a slab window. During the opening, partial melts from the spreading center migrate toward the subcontinental mantle and high temperatures in the forearc are predicted. The temporal evolution of the modeled temperature is consistent with observed heat flow data, and with magmatism and high-temperature metamorphism recorded in Chilean forearc rocks. Such migrated partial melts might explain the low viscosity inferred and low seismic velocity anomalies imaged in the slab window beneath South America, and the common geochemical signature of the Chile Ridge, the Taitao Ophiolite and the backarc magmatism. Following slab separation, our models suggest forearc uplift and changes in the stress regime, processes which are consistent with deformation records. Summarizing, our model of the geodynamic evolution of the Chile Ridge subduction provides a consistent framework that explains diverse records of magmatism, metamorphism, deformation and mantle physical properties.
dc.fuente.origenWOS
dc.identifier.doi10.1029/2023GC010977
dc.identifier.eissn1525-2027
dc.identifier.urihttps://doi.org/10.1029/2023GC010977
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/91725
dc.identifier.wosidWOS:001062493300001
dc.issue.numero9
dc.language.isoen
dc.revistaGeochemistry geophysics geosystems
dc.rightsacceso restringido
dc.subjectChile Triple Junction
dc.subjectslab window
dc.subjectmid-ocean ridge subduction
dc.subjectsubduction zones
dc.subjectgeodynamics
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleRidge Subduction: Unraveling the Consequences Linked to a Slab Window Development Beneath South America at the Chile Triple Junction
dc.typeartículo
dc.volumen24
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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