dc.creator | Seymour, N. M. | |
dc.creator | Singleton, J. S. | |
dc.creator | Gomila, R. | |
dc.creator | Mavor, S. P. | |
dc.creator | Heuser, G. | |
dc.creator | Arancibia, G. | |
dc.creator | Williams, S. | |
dc.creator | Stockli, D. F. | |
dc.date.accessioned | 2024-01-10T13:44:29Z | |
dc.date.accessioned | 2024-05-02T16:43:43Z | |
dc.date.available | 2024-01-10T13:44:29Z | |
dc.date.available | 2024-05-02T16:43:43Z | |
dc.date.created | 2024-01-10T13:44:29Z | |
dc.date.issued | 2021 | |
dc.identifier | 10.1144/jgs2020-142 | |
dc.identifier | 2041-479X | |
dc.identifier | 0016-7649 | |
dc.identifier | https://doi.org/10.1144/jgs2020-142 | |
dc.identifier | https://repositorio.uc.cl/handle/11534/78899 | |
dc.identifier | WOS:000624135600001 | |
dc.identifier.uri | https://repositorioslatinoamericanos.uchile.cl/handle/2250/9266909 | |
dc.description.abstract | Displacement 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.language | en | |
dc.publisher | GEOLOGICAL SOC PUBL HOUSE | |
dc.rights | registro bibliográfico | |
dc.subject | MEDIAN TECTONIC LINE | |
dc.subject | (U-TH)/HE THERMOCHRONOMETRY | |
dc.subject | COASTAL CORDILLERA | |
dc.subject | HE DIFFUSION | |
dc.subject | SUBDUCTION EROSION | |
dc.subject | MAGMATIC ARC | |
dc.subject | FORE-ARC | |
dc.subject | DEFORMATION | |
dc.subject | ZONE | |
dc.subject | ZIRCON | |
dc.title | Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence | |
dc.type | artículo | |