Abstract

JIMENEZ, Giovanny; LOPEZ, Oscar; JAIMES, Leonardo  and  UMANA, Ricardo Mier. Structural style variation related with basement anisotropies in the Middle Magdalena Valley. Rev. acad. colomb. cienc. exact. fis. nat. [online]. 2016, vol.40, n.155, pp.312-319. ISSN 0370-3908.  https://doi.org/10.18257/raccefyn.293.

Based 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.

Keywords : Structural style; Middle Magdalena Valley; tectonic inversion; structural domains.

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