Registro de tempestitas en llanura de cheniers durante los siglos I a.C./d.C.(estuario de Huelva)
- J. Rodríguez-Vidal 1
- M. Abad 2
- M. Cáceres 1
- M.L. González-Regalado 1
- M.J. Clemente 1
- P. Gómez 1
- A. Toscano 1
- T. Izquierdo 1
- F. Ruiz 1
- A.M.M. Soares 3
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1
Universidad de Huelva
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- 2 Universidad de Atacama, Copiapó, Chile
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3
Universidade de Lisboa
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ISSN: 1576-5172
Ano de publicación: 2015
Título do exemplar: VIII Jornadas de Geomorfología Litoral
Número: 15
Páxinas: 77-80
Tipo: Artigo
Outras publicacións en: Geotemas (Madrid)
Resumo
The inner area of the present Huelva estuary is formed by marshlands with sandy formations which record coastal barriers developed during the Late Holocene. The sandy barrier of La Cascajera, in the Saltés Island, is constituted by a tidal sand flat at the bottom overlied by sediments of chenier plain and, at the top of the sucession, a set of tempestite layers. This storm facies is located in the supratidal level and is only submerged during spring tides (1 to 2.5 m asl). The geomorphological mapping and stratigraphic sections show the development of SE to NW washover fans that record the supply of bioclastic sands into the marsh by southerly storm events. These sediments were transported from cheniers, beaches and foredunes located immediately to the south. Eventually, massive lag accumulations of Glycymeris shells reworked from beaches can be found filling the tidal creek. This storm facies reveals a very effective growth mechanism for the backshore area by means of its vertical aggradation and northward progradation during high-energy wave episodes. The calibrated and modelled radiocarbon dates in marine shells of different outcrops and sedimentary beds provide a time range in the transition between the late I BC and I AD centuries, at least two centuries before the first roman settlement in this site.