Examinando por Materia "Andes del Norte"
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Ítem ¿Cuándo y por qué se levantó la Cordillera Oriental?(Universidad EAFIT, 2020-12-01) Martinez Guerrero, Christian Alexander; Martinez-Guerrero, Christian Alexander; Bayona, Germán; Baquero, Mauricio; Ramírez, Catalina; Tabares, Manuela; Salazar, Ana M.; Nova, Giovanny; Duarte, Edward; Pardo, Andrés; Plata, Angelo; Jaramillo, Carlos; Rodríguez, Guillermo; Caballero, Victor; Cardona, Agustín; Montes, Camilo; Gómez Marulanda, Sebastián; Cárdenas Rozo, Andres L.; Biodiversidad, Evolución y ConservaciónÍtem Jurassic to early Cretaceous crustal thickness in the Colombian Northern Andes : insight on the magmatic thermal variations and emplacement conditions of plutonic rocks(Universidad Eafit, 2020) Chavarría Chavarría, Luisa Fernanda; Bustamante Londoño, CamiloÍtem El levantamiento de la cordillera Oriental: sus orígenes e importancia(2021-04-07) Martinez Guerrero, Christian Alexander; Christian Alexander Martinez-Guerrero; Christian Alexander Martinez-Guerrero; Bayona, Germán; Baquero, Mauricio; Ramírez, Catalina; Tabares, Manuela; Salazar, Ana M.; Nova, Giovanny; Duarte, Edward; Pardo, Andrés; Plata, Angelo; Jaramillo, Carlos; Rodríguez, Guillermo; Caballero, Victor; Cardona, Agustin; Montes, Camilo; Gómez, Sebastian; Cardenas, Andrés; Vicerrectoría de Descubrimiento y CreaciónÍtem Sedimentary signatures in Jambaló Blueschist : Tectonic implications(Universidad Eafit, 2023) Rodríguez Arango, Daniel; Bustamante Londoño, CamiloThe aim of this contribution is to analyze the sedimentary influence on the protoliths that gave rise to the blue schists of Jambaló, Cauca, Colombia, through the detailed identification of their mineralogical and structural characteristics. The hypothesis posits that the protolith of the Jambaló blue schists exhibits significant signs of a sedimentary component, which may reflect the proximity of an oceanic arc to the western margin of South America during the Cretaceous period. Fieldwork and petrographic analyses were conducted to characterize the blue and green schists in the area. Previous geochemical data were also reanalyzed. The results indicate that both types of schists share a common origin but followed distinct metamorphic paths. Geochemistry suggests a mixture of pelagic and terrigenous sediments in the protoliths, with a higher proportion of pelagic sediments. This supports the hypothesis of the proximity of an oceanic arc that accumulated these sediments. In conclusion, the Jambaló blue schists represent a metamorphic belt distinct from those previously proposed for the region. Their protoliths reflect the approach of an intra-oceanic arc to the continental margin during the Cretaceous.Ítem Structural geology and tectonic geomorphology of the Northeastern Cauca-Amagá Valley basin, Northern Andes block : evidence of neotectonics along the Cauca-Romeral fault system(Universidad EAFIT, 2020) Escobar Monsalve, Santiago; Mesa Escobar, Simón; Beltrán Triviño, AlejandroWe disclose new evidence of neotectonic activity associated with the Romeral fault system in the western flank of the Central Cordillera of the Colombian Andes and, provide a geomorphological analysis of a dynamic fluvial system related to this structural setting. This region is populated by several large cities and has been attached to a recent history of natural disasters such as the 1999 Armenia earthquake, therefore the effort to understand relative timing and surface expression of neotectonic events is more than worth. We use an integrated approach of structural geology and tectonic geomorphology to understand the relationship between geomorphic markers and active faults and other controls of landscape evolution such as denudation and fluvial agents. We propose that neotectonics in the study area is caused by triple-point stress within a transpressive kinematic model, that produced compressive and distension stress tensor along the Arma fluvial system and a clockwise motion on the western structural blocks.