Sedimentological and micropaleontological investigation in the upwelling region off Portugal

DOI

Quantitative studies have been carried out on opaline microfossils and diatom assemblage composition and preservation in two latest Quarternary (~100 ka to P.D. ) cores from the continental slope of Portugal. The sites are located in an area of modern summer coastal upwelling created by northerly trade winds. The spatial patterns and intensity of this upwelling system are accurately recorded by the diatom abundances and taxonomic composition in the surface sediments. The diatom record in these sequences indicates that coastal upwelling intensity was similar to present day during late Holocene, interglacial Stage 3 and late Stage 5; higher during Stage 2; and lower in the early Holocene. Paleoproductivity estimates are consistent with the diatom accumulation rates from Stage 3 to the Recent. This indicates that both the diatom and the organic carbon content of the sediments mainly reflect the biological productivity in the euphotic zone.

Supplement to: Abrantes, Fatima F (1991): Increased upwelling off Portugal during the last deglaciation: Diatom Evidence. Marine Micropaleontology, 17(3-4), 285-310

Identifier
DOI https://doi.org/10.1594/PANGAEA.714365
Related Identifier IsSupplementTo https://doi.org/10.1016/0377-8398(91)90017-Z
Metadata Access https://ws.pangaea.de/oai/provider?verb=GetRecord&metadataPrefix=datacite4&identifier=oai:pangaea.de:doi:10.1594/PANGAEA.714365
Provenance
Creator Abrantes, Fatima F ORCID logo
Publisher PANGAEA
Publication Year 1991
Rights Creative Commons Attribution 3.0 Unported; https://creativecommons.org/licenses/by/3.0/
OpenAccess true
Representation
Resource Type Supplementary Publication Series of Datasets; Collection
Format application/zip
Size 8 datasets
Discipline Earth System Research
Spatial Coverage (-10.343W, 40.572S, -10.205E, 40.687N)