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| DOI | 10.1029/2023TC008241 | ||||
| Año | 2024 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
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.
| 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
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| 3 | MORATA-CESPEDES, DIEGO ANTONIO | Hombre |
Universidad de Chile - Chile
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| 4 | De La Maza, Ignacia Perez | - |
Pontificia Universidad Católica de Chile - Chile
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| 4 | Pérez De La Maza, Ignacia | - |
Pontificia Universidad Católica de Chile - Chile
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| Agradecimiento |
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| 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. |