Geología (trabajo de grado)

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Análisis de las evidencias de migración del magmatismo de arco en el occidente colombiano durante el Cretácico Superior
(Universidad EAFIT, 2023) Alzate Giraldo, María Fernanda; Bustamante Londoño, Camilo
Along the Western Cordillera are located rocks of oceanic affinity to the west, and rocks of continental affinity to the east, separated by the Romeral Fault System, as a product of interactions between the Caribbean, Farallon, and South American plates. These rocks present ages ranging from Upper Cretaceous to the Lower Paleogene, implying that the formation of these plutonic igneous bodies occurred simultaneously, originated from two distinct magmatic arcs. The tectonic evolution of this zone is not fully clear yet, as two geological models are proposed where there are two subduction environments of different spatial distribution, due to some authors suggest that both subductions are dipping to the east, while others suggest that one of them is dipping to the west. Rodríguez et al. (2023) propose that, through the study of crystallization ages of igneous bodies in the Western Cordillera, there was a subduction migration event during the Upper Cretaceous, and because of this, they suggest that the distribution of both subductions is towards the east. This study includes analyses that demonstrate that the conditions at this time were not favorable for the occurrence of such event.