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Título: | Upwelling dominated oceanographic periods in the Ria de Vigo during the late Holocene |
Autor: | Martins, V. Araújo, M. F. Silva, E. F. Dias, J. M. A. Calisto, R. Jouanneau, J. M. Weber, O. Rocha, F. |
Palavras-chave: | Late Holocene Climatic conditions NW Iberian Margin Sedimentary dynamic Paleoproductivity Diagenesis |
Data: | 2011 |
Editora: | Coastal Education and Research Foundation |
Resumo: | Different oceanographic regimes were identified at millennial scale in the last 3 ka cal BP in a sedimentary sequence from the outer sector of Ria de Vigo (NW Spain) based on a multi-proxy approach (textural, mineralogical, geochemical and benthic foraminifera data). The prevalence of stronger wave climate linked with a developed downwelling regime and a more efficient erosion phase, allowed the deposition of coarser sediments, enriched in geogenic (Si/Al and Zr/Al) and biogenic chemical elements (Ca/Al and Sr/Al), coarse detrital minerals (quartz and feldspars) and carbonates during the periods ≈2.9-2.3 ka cal BP and ≈1.5-0.6 ka cal BP. However the prevalence of soother wave climate regime, linked with reinforced upwelling events, could have occurred between ≈2.5–1.5 ka cal BP and ≈0.5–0 ka cal BP, giving origin to a finer sedimentation enriched in organic matter and phyllosilicates. In these muddy events the consumption of oxygen during aerobic organic matter degradation caused suboxic/anoxic conditions in the sediments, which induced higher early diagenetic changes with pyrite formation in anoxic environments. When the sediments became again oxic/suboxic precipitation of redox, sensitive elements such as Fe and Ni could have arisen. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/27538 |
ISSN: | 0749-0208 |
Versão do Editor: | https://www.jstor.org/stable/26482526 |
Aparece nas coleções: | CESAM - Artigos DGeo - Artigos GeoBioTec - Artigos |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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Martins et al. - 2011 - Upwelling dominated oceanographic periods in the R.pdf | 328.79 kB | Adobe PDF |
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