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Magmatism and Polyphase Deformation in the Middle Jurassic Arc of Central Chile: Implications for the Tectonic Development of the Early Andean Margin
Indexado
WoS WOS:001281734600001
Scopus SCOPUS_ID:85200254705
DOI 10.1029/2023TC008241
Año 2024
Tipo artículo de investigación

Citas Totales

Autores Afiliación Chile

Instituciones Chile

% Participación
Internacional

Autores
Afiliación Extranjera

Instituciones
Extranjeras


Abstract



The 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.

Revista



Revista ISSN
Tectonics 0278-7407

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Disciplinas de Investigación



WOS
Geochemistry & Geophysics
Scopus
Sin Disciplinas
SciELO
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Publicaciones WoS (Ediciones: ISSHP, ISTP, AHCI, SSCI, SCI), Scopus, SciELO Chile.

Colaboración Institucional



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Autores - Afiliación



Ord. Autor Género Institución - País
1 Singleton, John S. - COLORADO STATE UNIV - Estados Unidos
Colorado State University - Estados Unidos
2 ARANCIBIA-HERNANDEZ, GLORIA CECILIA Mujer Pontificia Universidad Católica de Chile - Chile
3 MORATA-CESPEDES, DIEGO ANTONIO Hombre Universidad de Chile - Chile
4 De La Maza, Ignacia Perez - Pontificia Universidad Católica de Chile - Chile
4 Pérez De La Maza, Ignacia - Pontificia Universidad Católica de Chile - Chile

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Financiamiento



Fuente
University of Chile
ANID-FONDEQUIP

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Agradecimientos



Agradecimiento
The authors thank Nicole Briones Vargas for assistance with some of the fieldwork. The U/Pb zircon analyses from the University of Chile were performed thanks to the ANID-FONDEQUIP Grant EQM120098. We thank Rurik Romero and Prof. Dr. Fernando Barra (UCH) for the acquisition and preliminary interpretation of these analytical data. We also thank Lisa Stockli and Dr. James Metcalf for their contributions to the acquisition of apatite U-Pb data and (U-Th)/He data, respectively. Careful reviews by Melanie Noury and Gabriel Gonzalez improved this manuscript.
The authors thank Nicole Briones Vargas for assistance with some of the fieldwork. The U/Pb zircon analyses from the University of Chile were performed thanks to the ANID-FONDEQUIP Grant EQM120098. We thank Rurik Romero and Prof. Dr. Fernando Barra (UCH) for the acquisition and preliminary interpretation of these analytical data. We also thank Lisa Stockli and Dr. James Metcalf for their contributions to the acquisition of apatite U-Pb data and (U-Th)/He data, respectively. Careful reviews by M\u00E9lanie Noury and Gabriel Gonzalez improved this manuscript.

Muestra la fuente de financiamiento declarada en la publicación.