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handle: 10261/86599 , 10261/86600
[ES] El canal más reciente desarrollado al este del Sistema Turbidítico del Magdalena es analizado en términos de sinuosidad y de su relación con la existencia de fallas con el fin de definir factores específicos que controlan el proceso de avulsión. Este canal se desarrolla en el margen tectónicamente activo de Colombia (Mar Caribe). La sinuosidad del canal estudiado es altamente variable (entre 1.0 y 2.4) aunque a escala regional se diferencian dos segmentos: uno localizado en el talud continental con una sinuosidad promediada relativamente baja de 1.25, y otro desarrollado en el glacis continental de sinuosidad relativamente alta de 1.4. En ambos casos se observa la existencia de picos de sinuosidad alta. Algunos de los picos obedecen al desarrollo “natural” del canal pero otros están relacionados con la presencia de fallas. Los picos de sinuosidad resultan de la habilidad del canal para reducir los escarpes del margen o de los saltos de falla a través de incrementos locales de la sinuosidad. Estos picos locales presentan elementos morfológicos asociados tales como: diques internos o canales de “crevasse splay”. Estos elementos morfológicos aparecen en distintos grados de desarrollo: 1)un estadio inicial caracterizado por diques internos incipientes, 2) un estadio de madurez caracterizado por diques internos bien desarrollados y por la presencia de canales de “crevasse splay”, 3) un estadio final que puede desembocar en un proceso de estrangulación del canal y el desarrollo de una avulsión
[EN] The recentmost channel developed in the eastern of the Magdalena fan, which develops on the tectonically active margin of Colombia (Caribbean Sea), is analyzed in terms of sinuosity and its relationship with faults in order to define specific factors controlling avulsion processes. The sinuosity of this channel is highly variable, ranging from 1.0 to 2.4. The overall sinuosity of this channel can be grouped into two main segments: one with relatively low sinuosity (mean 1.25) in the continental slope, and the other one with relatively high sinuosity (mean 1.4) in the continental rise. In both cases we observe local peaks of higher sinuosity. Some of these peaks obey to “natural” development of the channel and others seem to be related to the presence of faults. These sinuosity peaks result from the channel ability to reduce the steepness of the regional slope or fault escarpment by means of local increment of sinuosity. The local peaks of sinuosity display morphological features associated to them as internal levees and crevasse splay channels. These morphological features present different degrees of development: 1) an initial stage with incipient internal levees, 2) a mature stage with well developed internal levees and related crevasse splay channels, 3) a final stage that would result in the meander strangulation and channel avulsion
VII Congreso Geológico de España, 14-18 Julio 2008, Las Palmas de Gran Canaria.-- 4 pages, 5 figures
The research was supported by the MAYC (AMB95-0196) and SAGAS (CTM05-08071-CO3-02) projects
Peer Reviewed
Sistema turbidítico del Magdalena, Avulsion, Magdalena turbidite system, Faults, Falla, Channel, Avulsión, Canal
Sistema turbidítico del Magdalena, Avulsion, Magdalena turbidite system, Faults, Falla, Channel, Avulsión, Canal
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