The Role of Temperature in the Along-Margin Distribution of Volcanism and Seismicity in Subduction Zones: Insights From 3-D Thermomechanical Modeling of the Central Andean Margin

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dc.contributor.authorAraya Vargas, J.
dc.contributor.authorSanhueza, J.
dc.contributor.authorYanez, G.
dc.date.accessioned2025-01-20T22:04:44Z
dc.date.available2025-01-20T22:04:44Z
dc.date.issued2021
dc.description.abstractThe distribution of volcanic and seismogenic zones is segmented along the trench-parallel direction in the Central Andes, and factors controlling their clustering are not fully understood. Here we present a 3-D thermomechanical model of the subduction zone at 18 degrees-26 degrees S to examine the role that temperature and mantle flow play in the distribution of active volcanoes and seismicity. We applied a steady state approach in which solid-state flow is driven by a kinematically prescribed slab with realistic geometry (including changes along the Bolivian Orocline) and using a 3-D model of the continental crust thickness. The obtained temperature distribution is consistent with proxies for isotherms derived from independent geophysical data, except below the Eastern Cordillera at 21 degrees-23 degrees S. The computed mantle flow pattern reveals the presence of along-margin dynamic pressure gradients. This 3-D preferential flow results in mantle temperatures of 1200-1400 degrees C at 80-100 km depth below the arc, with comparatively higher temperatures at similar to 22 degrees-25 degrees S. The obtained along-margin variations in temperature and in estimated melt velocity suggest that the subarc mantle south of 22 degrees S exhibits more favorable conditions for generation and upward migration of partial melts. This segment coincides with the higher concentration of active arc volcanoes and the presence of the Altiplano-Puna Volcanic Complex in the backarc. Intermediate-depth seismicity concentrates roughly below where the slab top is at 400-800 degrees C, suggesting that temperature exerts some control on the first-order distribution of intraslab seismicity. However, most intraslab seismicity occur at pressure-temperature conditions which are outside of the stability field expected for key dehydration reactions in slabs.
dc.fuente.origenWOS
dc.identifier.doi10.1029/2021TC006879
dc.identifier.eissn1944-9194
dc.identifier.issn0278-7407
dc.identifier.urihttps://doi.org/10.1029/2021TC006879
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/94104
dc.identifier.wosidWOS:000723093200002
dc.issue.numero11
dc.language.isoen
dc.revistaTectonics
dc.rightsacceso restringido
dc.subjectsubduction zones
dc.subjectAndes
dc.subjectgeodynamics
dc.subjectthermomechanical models
dc.subjectseismicity
dc.subjectvolcanism
dc.subject.ods11 Sustainable Cities and Communities
dc.subject.odspa11 Ciudades y comunidades sostenibles
dc.titleThe Role of Temperature in the Along-Margin Distribution of Volcanism and Seismicity in Subduction Zones: Insights From 3-D Thermomechanical Modeling of the Central Andean Margin
dc.typeartículo
dc.volumen40
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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