Correlación estratigráfica de la secuencia Pintajá (Sector Quebradas Pintajá,Puria y Niverengo) y la Formación Amagá.

Abstract

The integrated study of the Pintajá Sequence (SP, Cauca del Río Cauca sector, Anzá municipality) provides data and tools for the analysis of sedimentary and tectonic processes that influenced its formation and its relationship with contemporary sedimentary formations in the Amagá basin such as the Amagá Formation (FA). The AF and SP are controlled by an extensive deformation zone related to the Romeral-Cauca deformation zone, through which different tectonic sub-basins have been formed and segmented during the Cenozoic. Using the litho and bio-stratigraphic analysis of the SP, (geological cartography (1:25,000), stratigraphic and facial analysis (1:100)) and the comparative analysis between the SP and the AF (using secondary dataset), it was possible to conclude that, the sequence Pintajá, Sector Quebradas Pintajá, Puria and Niverengo - Anzá (Antioquia), is characterized by having a facial association of braided rivers towards the Oligocene-Miocene boundary, separated from the FA Lower Member (Eocene-Oligocene), by a contact failed. Additionally, the SP is not part of the Superior Member of the FA (unit 4, with facial similarities), differing from it in its pollen content and presence of lignite-like organic matter. Therefore, it is proposed that the SP was deposited from the reworking of the Lower Member of the Amagá Formation, associated with the Oligo-Miocene event controlled by local movements of blocks associated with the Proto-Cordillera Occidental.