%0 Journal Article
%A Vilas Martín, Federico
%A Arche, Alfredo
%T Subantarctic macrotidal flats, cheniers and beaches in SanSebastian Bay, Tierra Del Fuego, Argentina
%D 1999
%@ 0025-3227
%U https://hdl.handle.net/20.500.14352/57794
%X San Sebastian Bay is a large, semicircular coastal embayment situated on the Atlantic coast of Tierra del Fuego,Argentina. It is a high-energy, subantarctic environment with a tidal range of 10.4 m, influenced by large waves of Atlanticand local origin and swept by constant, strong westerly winds. A 17 km long gravel spit protects the Northern part of theBay giving rise to a gradient in sedimentary processes. From south to north, are seven distinct sedimentary environments.Coastal sedimentation started at least 5200 years before present BP. and a rapid progradation related to a relative sea-leveldrop has infilled about 6 kilometres of the Bay with a sedimentary sequence 10–11 m thick. 14-C dating of unabraded shellsin the Chenier ridges of the relict part of the complex allows for a precise reconstruction of the stages of the progradation,that has slowed from 2.35 mryear at 5000 years BP to 0.6 mryear at present. The possible causes of the sea-level drop arediscussed.
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