ResumenCon base en una revisión cartográfica en la zona central-este de la Cuenca VMM, la colección de datos estructurales y la elaboración de 3 cortes estructurales, se definieron 3 dominios estructurales en el área de estudio. El dominio este, dominio central y dominio oeste. El dominio este se caracteriza por la presencia de fallas inversas de alto ángulo y vergencia este, que involucran rocas Jurásicas. Los dominios central y oeste se caracterizan por la presencia de fallas inversas vergencia al oeste que involucran de manera general rocas del Cretácico inferior y rocas del Paleógeno-Neógeno. El corte regional muestra que las fallas del dominio este corresponden a estructuras con inversión tectónica evidenciadas por los cambios de espesor de la Formación Girón; estas estructuras se definen como un estilo estructural dominado por una deformación tipo thick-skinned. Las estructuras de los dominios central y oeste muestran fallas inversas con despegues y rampas en las unidades Cretácicas y Paleógenas dominadas por una deformación tipo thin-skinned. El modelo regional planteado muestra un estilo estructural divergente y difiere del modelo estructural reportado en estudios previos. En el presente trabajo se propone una zona transversal para explicar las variaciones en el estilo estructural del Valle Medio del Magdalena de sur a norte. © Acad. Colomb. Cienc. Ex. Fis. Nat. 2016. Palabras clave: estilo estructural, Valle Medio del Magdalena, inversión tectónica, dominios estructurales. Structural style variation related with basement anisotropies in the Middle Magdalena Valley AbstractBased on a cartographic review of the central-eastern zone of the MMV Basin, the collection of structural data and 3 structural cross sections, it was possible to define three structural domains in the study area: The eastern domain, central domain and western domain. The eastern domain is characterized by east vergent and high angle reverse faults, involving the Girón Formation. Central and western domains are characterized by west vergent reverse faults involving Lower Cretaceous to Paleogene and Neogene rocks. A regional cross section shows that faults in the eastern domain correspond to tectonic inversion structures evidenced by changes in thickness of the Girón Formation. These structures are defined as a structural style dominated by thick-skinned deformation type. Structures of the central and western domains are characterized by flat-ramp reverse faults in the Cretaceous and Paleogene units dominated by thin-skinned deformation type. The regional model proposed shows a divergent structural style and differs from the structural model reported in previous studies. In this paper we propose a transverse zone to explain variations in the structural style of the Middle Magdalena Valley from south to north.
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