Browsing by Author "Mavor, S. P."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Magnitude, timing, and rate of slip along the Atacama fault system, northern Chile: implications for Early Cretaceous slip partitioning and plate convergence
    (GEOLOGICAL SOC PUBL HOUSE, 2021) Seymour, N. M.; Singleton, J. S.; Gomila, R.; Mavor, S. P.; Heuser, G.; Arancibia, G.; Williams, S.; Stockli, D. F.
    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:
  • Thumbnail Image
    Item
    The Relationship Between Magmatism and Deformation Along the Intra-arc Strike-Slip Atacama Fault System, Northern Chile
    (2020) Seymour, N. M.; Singleton, J. S.; Mavor, S. P.; Gomila, Rodrigo; Stockli, D. F.; Heuser Amaya, Gert Klaus; Arancibia Hernández, Gloria Cecilia
  • Thumbnail Image
    Item
    Timing, Kinematics, and Displacement of the Taltal Fault System, Northern Chile : Implications for the Cretaceous Tectonic Evolution of the Andean Margin
    (2020) Mavor, S. P.; Singleton, J. S.; Gomila, Rodrigo; Heuser Amaya, Gert Klaus; Seymour, N. M.; Williams, S. A.; Arancibia Hernández, Gloria Cecilia; Johnston, S. M.; Kylander Clark, A. R. C.; Stockli, D. F.