Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence

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dc.contributor.authorSeymour, N. M.
dc.contributor.authorSingleton, J. S.
dc.contributor.authorGomila, R.
dc.contributor.authorMavor, S. P.
dc.contributor.authorHeuser, G.
dc.contributor.authorArancibia, G.
dc.contributor.authorWilliams, S.
dc.contributor.authorStockli, D. F.
dc.date.accessioned2024-01-10T13:44:29Z
dc.date.available2024-01-10T13:44:29Z
dc.date.issued2021
dc.description.abstractDisplacement estimates along the Atacama fault system (AFS), a crustal-scale sinistral structure that accommodated oblique convergence in the Mesozoic Coastal Cordillera arc, vary widely due to a lack of piercing points. We map the distribution of plutons and mylonitic deformation along the northern c. 70 km of the El Salado segment and use U-Pb geochronology to establish the slip history of the AFS. Along the eastern branch, mylonitic fabrics associated with the synkinematic c. 134-132 Ma Cerro del Pingo Complex are separated by 34-38 km, and mylonites associated with a synkinematic c. 120-119 Ma tonalite are separated by 20.5-26 km. We interpret leucocratic intrusions to be separated across the western branch by c. 16-20 km, giving a total slip magnitude of c. 54 +/- 6 km across the El Salado segment. Kinematic indicators consistently record sinistral shear, and zircon (U-Th)/He data suggest dip-slip motion was insignificant. Displacement occurred between c. 133-110 Ma at a slip rate of c. 2.1-2.6 km Myr(-1). This slip rate is low compared to modern intra-arc strike-slip faults, suggesting (1) the majority of lateral slip was accommodated along the slab interface or distributed through the forearc or (2) plate convergence rates/obliquity were significantly lower than previously modeled. Supplementary material: Full U-Pb, (U-Th)/He, petrographic, and structural data with locations is available at Thematic collection:This article is part of the Isotopic dating of deformation collection available at:
dc.description.funderNational Science Foundation
dc.description.funderGeological Society of America
dc.fechaingreso.objetodigital2024-05-14
dc.format.extent22 páginas
dc.fuente.origenWOS
dc.identifier.doi10.1144/jgs2020-142
dc.identifier.eissn2041-479X
dc.identifier.issn0016-7649
dc.identifier.urihttps://doi.org/10.1144/jgs2020-142
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/78899
dc.identifier.wosidWOS:000624135600001
dc.information.autorucFacultad de Ingeniería; Arancibia Hernandez, Gloria Cecilia; S/I; 1008583
dc.language.isoen
dc.nota.accesocontenido parcial
dc.publisherGEOLOGICAL SOC PUBL HOUSE
dc.revistaJOURNAL OF THE GEOLOGICAL SOCIETY
dc.rightsacceso restringido
dc.subjectMEDIAN TECTONIC LINE
dc.subject(U-TH)/HE THERMOCHRONOMETRY
dc.subjectCOASTAL CORDILLERA
dc.subjectHE DIFFUSION
dc.subjectSUBDUCTION EROSION
dc.subjectMAGMATIC ARC
dc.subjectFORE-ARC
dc.subjectDEFORMATION
dc.subjectZONE
dc.subjectZIRCON
dc.subject.ods13 Climate Action
dc.subject.odspa13 Acción por el clima
dc.titleMagnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence
dc.typeartículo
sipa.codpersvinculados1008583
sipa.indexWOS
sipa.trazabilidadCarga SIPA;09-01-2024
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