Escudo de la República de Colombia
Sistema Nacional de Biliotecas - Repositorio Institucional Universidad Nacional de Colombia Biblioteca Digital - Repositorio Institucional UN Sistema Nacional de Bibliotecas UN

Episodios de reactivación del sistema de fallas del Romeral en la parte Nor-Occidental de los Andes Centrales de Colombia a través de resultados 39AR-40AR y K-AR.

Vinasco Vallejo, Cesar and Cordani, Umberto (2012) Episodios de reactivación del sistema de fallas del Romeral en la parte Nor-Occidental de los Andes Centrales de Colombia a través de resultados 39AR-40AR y K-AR. Boletín de Ciencias de la Tierra (32). pp. 111-124. ISSN 0120-3630

Texto completo

[img]
Vista previa
PDF
728kB

Resumen

Direct dating of reactivation of the San Jerónimo Fault (SJF), easternmost limit of the Romeral fault system (RFS), is presented through 39Ar-40Ar and K-Ar results in neo-formed micas and mylonitic bands of strongly hidrothermalized gabbros. Published cooling and crystallization ages from sin-tectonic magmatic rocks exposed in the western fl ank of the Central Cordillera have suggest that tectonic evolution of the paleo-fault system began since Triassic and Lower Jurassic before the installation of Central Cordillera in its present position relative to the South American margin (SOAM). The Sabaletas greenchists (Arquía complex) yields 39Ar-40Ar plateau age of 127±5 Ma and integrated ages between 102-115 Ma eventually recording the initial accommodation of the Albian-Aptian volcanosedimentary sequence of the Quebradagrande Complex to the continental margin. Direct dating of fault reactivation of SJF through 39Ar-40Ar analysis in neo-formed micas in mylonitic bands and K-Ar ages in a hidrothermalized gabbro belonging to the Quebradagrande volcanic rocks shows plateau ages ranging from 87-90 Ma in biotite and 72-81 Ma in sericite, whereas K-Ar whole rock ages in samples collected in the area of infl uence of the SJF range between 91-102 Ma. The predominance of Upper Cretaceous ages suggest that activity of the fault system rich the major and most important peak during this time spam. This age interval is most likely related to the oblique arrival and collision of the Caribbean-Colombian Oceanic Plateau (CCOP) episodically during the upper cretaceous. Final deformational episodes in the Central Cordillera and RFS are related to the collision of the Panamá-Chocó block in Early Mioceneearly Pliocene, and are recorded by 39Ar-40Ar and K-Ar ages in Mio-Pliocene intrusives along the Cauca depression.

Tipo de documento:Artículo - Article
Palabras clave:Falla Romeral, Cordillera Centra de los Andes (Colombia)
Temática:5 Ciencias naturales y matemáticas / Science > 55 Ciencias de la tierra / Earth sciences & geology
Unidad administrativa:Sede Medellín > Facultad de Minas > Escuela de Geociencias y Medio Ambiente
Código ID:9652
Enviado por : Unidad de Documentación de Recursos Hidráulicos
Enviado el día :17 Julio 2013 18:29
Ultima modificación:17 Julio 2013 18:39
Ultima modificación:17 Julio 2013 18:39
Exportar:Clic aquí
Estadísticas:Clic aquí
Compartir:

Solamente administradores del repositorio: página de control del ítem

Vicerrectoría de Investigación: Número uno en investigación
Indexado por:
Indexado por Scholar Google WorldCat DRIVER Registry of Open Access Repositories OpenDOAR Metabiblioteca BDCOL OAIster Red de repositorios latinoamericanos DSpace BASE Open archives La referencia Colombiae Open Access Theses and Dissertations Tesis latinoamericanas CLACSO
Este sitio web se ve mejor en Firefox