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handle: 10261/86568 , 10261/86574
[ES] Este estudio presenta una caracterización regional en detalle de la fisiografía, rasgos morfológicos y sistemas sedimentarios de la Cuenca Central de Bransfield (CCB), basada en datos de batimetría multihaz y perfiles de sísmica de reflexión de alta y muy alta resolución. La CCB es una cuenca asimétrica, y sus márgenes (Islas South Shetland, ISS, y Península Antártica, PA) están formados por plataformas continentales erosionadas por surcos glaciales, y taludes continentales con un dominio medio formado por plataformas de talud. La mayoría de rasgos morfológicos son de origen sedimentario y constituyen elementos arquitecturales que componen cuatro sistemas sedimentarios: glacialglaciomarino, de talud-cuenca, de flujo de fluidos y contornítico. Estos sistemas presentan una clara zonación desde la plataforma a la cuenca, que refleja el predominio de los procesos sedimentarios responsables de su formación: glaciales, glaciomarinos, marinos y oceanográficos. La morfología de la CCB está controlada fundamentalmente por la ciclicidad glacial/interglacial y en menor medida por la tectónica, fisiografía y oceanografía. La distribución de los sistemas sedimentarios indica que la capa de hielo estuvo anclada en posiciones muy distales de las plataformas de talud, a profundidades de hasta 1000 m, durante el último máximo glacial y que los flujos de hielo en las plataformas de talud tuvieron una dirección predominante hacia el este. Los márgenes ISS y PA se caracterizan como un margen probremente alimentado y un margen más construccional, respectivamente
[EN] This work presents a new detailed regional characterization of the physiography, morphological features and sedimentary systems of the Central Bransfield Basin (CBB), based on swath bathymetry data and high- and very high-resolution seismic profiles. CBB is an asymmetric basin, with two margins, South Shetland Islands (SI) and Antarctic Peninsula (AP), with continental shelves cut by glacial troughs and continental slopes with a middle domain composed of relatively wide and flat slope platforms. Most morphological features on the CBB are sedimentary in origin, and compose four sedimentary systems: glacial-glaciomarine, slope-basin, seabed fluid dynamics and contouritic systems. Sedimentary systems show a clear zoning from shelf to basin which reflects the dominance of sedimentary processes: glacial, glaciomarine, marine and oceanographic. CBB morphology is mainly controlled by glacial/interglacial cyclicity, and secondarily by tectonics, physiography and oceanography. The distribution of sedimentary systems indicates that during the last glacial maximum ice sheet grounded at very distal positions on the slope platforms, at depths of up to 1000 m. It also reveals a general NE trend of the ice sheet and ice streams on the slope platforms. The SSI and AP margins are characterized as a relatively starved margin and a more constructional margin, respectively
Data were obtained by the MAGIA (ANT-584/97) and GEBRA ’93 (ANT93-1008-C03-01) projects. Financial support was provided by the CGL2007- 28815-E, MARSIBAL (REN2001-3868-C03-03) and SAGAS (CTM2005-08071-C03-02) projects
VII Congreso Geológico de España, 14-18 Julio 2008, Las Palmas de Gran Canaria.-- 4 pages, 2 figures, 1 table
Peer Reviewed
Cuenca de Bransfield, Sedimentary systems, Glaciomarine processes, Glacial processes, Sistemas sedimentarios, Fisiografía, Physiography, Bransfield Basin, Procesos glaciales, Procesos glaciomarinos
Cuenca de Bransfield, Sedimentary systems, Glaciomarine processes, Glacial processes, Sistemas sedimentarios, Fisiografía, Physiography, Bransfield Basin, Procesos glaciales, Procesos glaciomarinos
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