Tectonic segmentation across Patagonia controlled by the subduction of oceanic fracture zones

• Main Authors: Orts, Darío Leandro, Álvarez, Orlando, Zaffarana, Claudia Beatriz, Gimenez, Mario, Ruiz, Francisco, Folguera, Andrés
• Language: English
• Published: Elsevier Ltd. 2021
• Subjects: Ciencias de la Tierra (General); Andes; Zonas de Fracturas Oceánicas; Segmentación Tectónica; Argentina; Pablo; Patagonia; San Juan; Antarc*; Antarctica
• Online Access: http://rid.unrn.edu.ar/handle/20.500.12049/6695; https://hdl.handle.net/20.500.12049/6695; https://www.sciencedirect.com/science/article/abs/pii/S0264370720301484; https://doi.org/10.1016/j.jog.2020.101806

Fil: Orts, Darío Leandro. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina Fil: Orts, Darío Leandro. Consejo Nacional de Investigaciones científicas y Tecnológicas (CONICET). Buenos Aires, Argentina. Fil: Álvarez, Orlando. Universidad Nacional de San Juan. CONICET. Instituto Geofísico y Sismológico Ing. Volponi. San Juan, Argentina. Fil: Zaffarana, Claudia Beatriz. Universidad Nacional de Río Negro, Instituto de Investigación en Paleobiología y Geología. Río Negro, Argentina Fil: Zaffarana, Claudia Beatriz. Consejo Nacional de Investigaciones científicas y Tecnológicas (CONICET). Buenos Aires, Argentina. Fil: Gimenez, Mario. Universidad Nacional de San Juan. CONICET. Instituto Geofísico y Sismológico Ing. Volponi. San Juan, Argentina. Fil: Folguera, Andrés. Universidad de Buenos Aires–CONICET. Instituto de Estudios Andinos “Don Pablo Groeber”. Buenos Aires, Argentina Fil: Ruiz, Francisco. Universidad Nacional de San Juan. CONICET. Instituto Geofísico y Sismológico Ing. Volponi. San Juan, Argentina. A set of fracture zones left by transform faults segmenting the active Chile Ridge that separates the Nazca and Antarctica Plates has been subducting beneath western Patagonia in the last 18 Myr. The subduction direction of these fractures zones has remained almost unaltered during this time lapse since these intersected the Chilean trench. In this context, the analyzed Patagonian sector is associated with the subduction of a highly buoyant oceanic floor due to its relatively young age that contrasts with the ocean floor bathymetry to the north where oceanic crust gets progressively older up to the Eocene and consequently isostatically subsides. Short-term elastic deformational patterns associated with the earthquake cycle have been linked to this segmentation imposed by subducting fracture zones in previous works. Similarly, this work explores the relationship between long-term topography, seismicity, gravity, and magnetic anomalies as a ...