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Influence of diagenetic processes and terrestrial/anthropogenic sources in the REE contents of the Cascais submarine canyon (Iberian western coast)

2021Journal article Open access
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dc.contributor.authorMil-Homens, Mário
dc.contributor.authorBrito, Pedro Oliveira
dc.contributor.authorCaetano, M.
dc.contributor.authorCosta, A. M.
dc.contributor.authorLebreiro, Susana
dc.contributor.authorTrancoso, Maria Ascensão
dc.contributor.authorDe Stigter, H.
dc.date.accessioned2021-04-13T11:22:15Z
dc.date.available2021-04-13T11:22:15Z
dc.date.issued2021
dc.description.abstractABSTRACT: Temporal variations of rare earth elements (REE) and their fractionation patterns, major elements, Pb and Hg were determined in two multicores collected at 445 and 2100 m water depth (mwd) in the Cascais submarine canyon (CSC). The PAAS-normalized REE patterns suggest mixing of Tagus estuarine and marine sediments, marked by MREE (Nd‐Dy series) enrichment and by positive Eu-anomaly, with marine sediments. The positive Eu/Eu* implies incorporation of detrital feldspar minerals derived from the estuary. Ce/Ce*, (La/Yb)PAAS and (Nd/Yb)PAAS show differences between the two cores. Core 252-35 from the shallower site is enriched in HREE (Ho‐Lu series) over LREE (La‐Pr series), a pattern also found in the Tagus estuary in the vicinity of an abandoned chemical complex, where the environment is affected by the legacy of massive-sulfide ores processing. There seems to be only limited down-canyon sediment transport to the deeper reaches where core 252-32 was collected. This deeper site shows Ce/Ce* peaks coinciding with low (La/Yb)PAAS values suggesting preferential diagenetic remobilization of LREE relative to HREE. Upcore Pb/Al and Hg/Corg trends observed in both cores indicate dispersion of the anthropogenic component from the estuary through the CSC, which is less obvious from the ∑REE/Al trends particularly in the deeper site. This may suggest the influence of diagenetic processes in the REE signal, associated with relatively low sediment accumulation rates.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMil-Homens, Mário... [et.al.] - Influence of diagenetic processes and terrestrial/anthropogenic sources in the REE contents of the Cascais submarine canyon (Iberian western coast). In: Science of the Total Environment, 2021, Vol. 773, article nº 145539pt_PT
dc.identifier.doi10.1016/j.scitotenv.2021.145539pt_PT
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/10400.9/3547
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCSS project - MAR- 01.04.02-FEAMP-0013pt_PT
dc.relationSEDIMENT TRANSPORT IN THE SETUBAL AND LISBON SUBMARINE CANYONS
dc.relation.publisherversionhttps://doi.org/10.1016/j.scitotenv.2021.145539pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectContaminação de águaspt_PT
dc.subjectSedimentos marinhospt_PT
dc.subjectCanhão Submarino de Cascais (Portugal)pt_PT
dc.subjectMargem Continental Portuguesapt_PT
dc.titleInfluence of diagenetic processes and terrestrial/anthropogenic sources in the REE contents of the Cascais submarine canyon (Iberian western coast)pt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleSEDIMENT TRANSPORT IN THE SETUBAL AND LISBON SUBMARINE CANYONS
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/PDCT/PDCT%2FMAR%2F56781%2F2004/PT
oaire.citation.titleScience of the Total Environmentpt_PT
oaire.citation.volume773pt_PT
oaire.fundingStreamPDCT
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isProjectOfPublication316ccd24-f8ed-4841-b9e0-c23308e8069a
relation.isProjectOfPublication.latestForDiscovery316ccd24-f8ed-4841-b9e0-c23308e8069a

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