Paper No. 323-19
Presentation Time: 1:30 PM
LARGE MORPHOTECTONICS ELEMENTS RELATED TO NEOTECTONICS AND SEISMICITY OF EAST FLANK OF COLOMBIAN EASTERN CORDILLERA (4° - 5° N, 73° - 74° W)
RODRIGUEZ, Luisa Fernanda, Decanato de Arquitectura e Ingeniería Civil, Corporacion Universitaria del Meta, Carrera 33 Nº 34 - 06, piso 7, Edificio Héroes del Pantano de Vargas, Calle 15 N° 47 - 05 , Bloque 05 Apto. 203, Villavicencio, 50001, Colombia, CHICANGANA, German, Vicerrectoría de Investigaciones, Corporacion Universitaria del Meta, Carrera 33 Nº 34 - 06, piso 7, Edificio Héroes del Pantano de Vargas, Calle 46A N° 45 - 14, Villavicencio, 50001, Colombia, VARGAS-JIMENEZ, Carlos Alberto, Department of Geosciences, Universidad Nacional de Colombia, Carrera 45 N° 26-85, Edificio Uriel Gutierréz, oficina 215, Ciudad Universitaria, Bogota D.C, 111321, Colombia, MUÑOZ BURBANO, Francisco Javier, Departamento de Geociencias, Universidad Nacional de Colombia, Carrera 45 N° 26-85, Edificio Uriel Gutierréz, oficina 506, Bogota D.C, 11001000, Colombia, GARCÍA-LOZANO, Aura Cristina, Decanato de Arquitectura e Ingeniería Civil, Corporacion Universitaria del Meta, Calle 6 N°34 - 123 Barrio Vega Oriental, Villavicencio, 50001, Colombia and PEDRAZA-GARCÍA, Patricia, Red Sismologica Nacional de Colombia, Servicio Geológico Colombiano, Diagonal 53 N0. 34 - 53, Villavicencio, 11001000, Colombia
The Colombian Eastern Cordillera was result of the fast rising of Mesozoic and Cenozoic rocks in last 8 million years when a Late Jurassic rift basin suffered a tectonic inversion. The development of Late Jurassic rift basin produces the cortical breaking that produces normal faults parallel to depocenter axis.
In Late Cretaceous because to collision of the Caribbean plate with northwestern corner of South America a strong compressive stress was occur and kinematics changes were presented in the normal faults restrained to the basin, where these were converted in inverse faults. Result of this in Paleogene was produced a first shortening step that leave an immature fragmented Eastern cordillera. Then from Late Miocene to Present times the Eastern Cordillera presents a definitive growth by the Nazca plate subduction evolution.
Several geomorphic features of the east flank of the Eastern Cordillera are related to morphotectonics, and these are related to the active faults configuration that derived of Cenozoic – Quaternary tectonic activity in spite of the high rainfall that has stayed constant most of the Quaternary with their subsequent erosive process.
We indicate that the faults associated to the morphotectonics features in a regional scale are related with the seismic activity of this Eastern cordillera sector because they leave neotectonics evidences in some places.
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