Magnetic fabric of deformed Quaternary sediments: contributions to the understanding of the neotectonic activity in the surroundings of the Aburrá Valley, Central Cordillera, Colombia

The origin of the Aburrá Valley (AV) is proposed as a set coalescent tectonic subbasins located along northern portion Central Cordillera Colombia, Northern Andes Colombia. Itagüí, Medellín, Bello, and Barbosa have developed between Romeral Shear Zone (RSZ) Antioqueño Batholith starting in Late Cenozoic. aim this study to contribute understanding AV neotectonic framework using anisotropy magnetic susceptibility (AMS) structural analysis. For this, we measure fabric ellipsoid shape faulted sediments compare them with geometry kinematics fault planes determine their relationship present-day stress field regional architecture. principal directions elongation axes La Brizuela Yarumalito sites were NE-SW, following lineation trend marking normal displacement dextral component. A marked NW-SE cleavage was found for Caimana site strike-slip setting. Holocene ruptures zone (i.e., RSZ) surroundings, may indicate faulting, bends steps over basins controlled primarily by R´ P structures. Moreover, active faults east post Plio-Pleistocene deformations faulting through 90/80 150/70 antithetic faults. This work identifies AMS technique powerful tool, urban surrounding areas.