Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.9/2332
Título: Benchmarks and sediment source(s) of the 1755 Lisbon tsunami deposit at Boca do Rio Estuary
Autor: Font, Eric
Pires, Cristina Veiga
Pozo, Manuel
Nave, Sílvia
Costas, Susana
Ruiz Muñoz, Francisco
Abad, Manuel
Simões, Nuno
Duarte, Sílvia
Rodríguez-Vidal, Joaquín
Palavras-chave: Depósitos de Tsunami
Geoquímica
Mineralogia
Hidrodinâmica
Estuários
Tsunami de 1755 (Portugal)
Boca do Rio (Portugal)
Data: Set-2013
Citação: Font, Eric... [et al.] - Benchmarks and sediment source(s) of the 1755 Lisbon tsunami deposit at Boca do Rio Estuary. In: Marine Geology, Vol. 343 (1 September 2013), p. 1-14
Resumo: Standardizing the signature of tsunami deposits has been identified as a major limitation for the identification of paleo-tsunami deposits. This limitation mostly arises from the strongly source-dependent nature of these deposits, which in turn determines their composition and depositional architecture, and from the effect of the local morphology of the corresponding depositional environment. Here, we provide new high-resolution mineralogical, geochemical and micro/macrofauna data of the 1755 tsunami layer of Boca do Rio estuary (Algarve, Portugal) with the aim of unraveling the signatures of estuarine tsunami deposits and linking them to possible sediment sources. We also apply for the first time diffuse reflectance spectrophotometry (DRS) analysis. Our results show that the 1755 tsunami deposit of the Boca do Rio estuary is featured by an enhancement in Sr and Ca, which are linked to the input of biogenic and detrital carbonates (shell fragments and limestone clasts) from the beach foreshore and a strong depletion in most terrestrial- and marine-sensitive indicators. The latter is interpreted as resulting from the reworking of the estuarine clays and subsequent dilution within a huge volume of sand eroded from the coastal barrier. It confirms that in the case of the Boca do Rio estuary, the sediment source is essentially proximal and coastal. Textural and mineralogical features between the base and the top of the tsunami layer suggest the imprint of run-up and backwash currents derived from a unique wave. Micro and macrofauna analysis and DRS data of the siliciclastic fraction show slight but significant environmental changes occurring just after the tsunami, which could be provoked by an eventual closure of the estuary mouth.
URI: http://hdl.handle.net/10400.9/2332
ISSN: 0025-3227
Versão do Editor: http://dx.doi.org/10.1016/j.margeo.2013.06.008
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