Magmatism and Polyphase Deformation in the Middle Jurassic Arc of Central Chile: Implications for the Tectonic Development of the Early Andean Margin

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dc.contributor.authorSingleton, John S.
dc.contributor.authorArancibia, Gloria
dc.contributor.authorMorata, Diego
dc.contributor.authorDe La Maza, Ignacia Perez
dc.date.accessioned2025-01-20T16:11:57Z
dc.date.available2025-01-20T16:11:57Z
dc.date.issued2024
dc.description.abstractThe similar to 173-164 Ma Papudo-Quintero plutonic complex near 32.5 degrees S in central Chile records three deformation events that provide insight into the tectonic development of the early Andean margin. The first event (D-1) includes: (a) high-temperature (>600 degrees C), coaxial-dominated strain along NE- to N-striking subvertical shear zones; (b) widespread emplacement of granitic dikes that dip gently to steeply NE; and (c) development of narrow (<10 cm thick) strike-slip and oblique-reverse shear zones. These D-1 structures record NW-SE to WNW-ESE transpressional shortening with a component of sinistral shear parallel to the N-S trending magmatic arc. Zircon and apatite U-Pb dates and cross-cutting relations constrain most D-1 deformation to similar to 166-164 Ma. The second event (D-2) occurred during postmagmatic cooling in the Late Jurassic and was characterized by development of pervasive E-W-striking veins with alteration halos and minor strike-slip and normal faults that record N-S extension in a transtensional regime. Structures associated with the last deformation event (D-3) include Late Jurassic to Early Cretaceous mafic dikes, veins, and conjugate strike-slip faults that record NW-SE to N-S shortening in a strike-slip regime. D-1 deformation is consistent with studies from other areas that document NW-SE shortening +/- sinistral transpression along the arc throughout the Jurassic, suggesting this deformation was regional in scale and driven by oblique subduction convergence. Deformation associated with oblique convergence was localized within the active magmatic arc, which was an important process in the early Andean orogeny. As the arc migrated eastward, D-2 and D-3 structures formed in a low-stress regime in an arc margin or forearc setting.
dc.description.funderUniversity of Chile
dc.fuente.origenWOS
dc.identifier.doi10.1029/2023TC008241
dc.identifier.eissn1944-9194
dc.identifier.issn0278-7407
dc.identifier.urihttps://doi.org/10.1029/2023TC008241
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/90304
dc.identifier.wosidWOS:001281734600001
dc.issue.numero8
dc.language.isoen
dc.revistaTectonics
dc.rightsacceso restringido
dc.subjectAndean margin
dc.subjectmagmatic arc
dc.subjectMiddle Jurassic
dc.subjectPapudo-Quintero
dc.subjectshear zone
dc.subjecttranspression
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleMagmatism and Polyphase Deformation in the Middle Jurassic Arc of Central Chile: Implications for the Tectonic Development of the Early Andean Margin
dc.typeartículo
dc.volumen43
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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