Análisis morfosedimentario detallado del Margen Pacífico septentrional de la Península Antártica

• Autores: Ferran Estrada Llacer, Miquel Canals Artigas, Gemma Ercilla Zárraga, Belén Alonso Martínez
• Localización: Geotemas (Madrid), ISSN 1576-5172, Nº. 1, 4, 2000 (Ejemplar dedicado a: V Congreso Geológico de España (Alicante, 10-14 julio 2000)), págs. 135-138
• Idioma: español
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• Resumen

  • The Antarctic Peninsula Pacific Margin of Palmer Archipelago has been studied by means of EM I2 multibeam high resolution bathymetry. In each fisiographic province, shelf, slope and continental rise, we have identified different morphosedimentary features. In the outer continental shelf there are two main progradational lobes over which an irregular sedimentary front identified as a till-delta is observed. The continental slope is very steep, reaching up to 22°, and is carved by short gullies that do not seems to erode the shelf break and the upper continental rise. In this latter physiographic province there are five sedimentary mounds of variable size and shape with a NW oriented crests. Between them develop four main channels responsible of the mound building. These channels are tributed by several feeding heads at the upper continental rise and by trough corridors initiated at the crest of the mounds. Also semicircular scars are identified in the continental rise, but mainly in the mound crests. All these morphosedimentary features of predominantly NW direction, probably are inherited of the past glacial periods.

    Nowadays, because the sedimentary conditions have changed, the continental rise is readjusting to a new situation by means of mound erosion through new erosive channels and sedimentary instability processes that follow a main NNE direction.