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Footprint of roman and modern mining activities in a sediment core from the southwestern Iberian Atlantic shelf

2016-11Journal article Restricted
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dc.contributor.authorMil-Homens, Mário
dc.contributor.authorVale, Carlos
dc.contributor.authorNaughton, Filipa
dc.contributor.authorBrito, Pedro
dc.contributor.authorDrago, Teresa
dc.contributor.authorAnes, Bárbara
dc.contributor.authorRaimundo, Joana
dc.contributor.authorSchmidt, Sabine
dc.contributor.authorCaetano, Miguel
dc.date.accessioned2017-04-07T15:55:45Z
dc.date.available2017-04-07T15:55:45Z
dc.date.issued2016-11
dc.description.abstractA 5-m long sediment core (VC2B), retrieved in the Southwestem Iberian Atlantic shelf, at 96 m water depth, was used to assess major changes in climate and human activities during the last 9.7 kyrs. Analytical measurements included sedimentological (mean grain size, and the contents of sand, silt and day), geochemical (major, minor, trace and rare earth elements; REEs) and chronological (Pb-210 and C-14) parameters. Two episodes of increment of fine-grained particles, occurring at 3050 BCE and 1350 CE, suggest the retreat of the coast line to the present level and the beginning of a wetter phase associated with the "Little Ice Age". The North American Shale Composite (NASC)-normalized REE-pattern detected in the shelf is similar to that found in the Guadiana estuarine sediments. The possibility of this estuary as a contributor to the sediment load deposited in the adjacent coastal zone was indicated. Trace elements were significantly correlated with Al until 1850 CE, pointing that grain-size rules its distribution in sediments. The depth variation of As, Cu and Pb enrichment factors relative to background values shows two periods of intense human activity that can be mainly linked to mining: (i) across the Roman Period, marked by low enrichments; and (ii) starting on the second half of the 19th century until nowadays with significantly increased enrichments, especially of Pb and Cu. In addition to As, Cu and Pb, this period is also marked by high enrichments of Hg and Zn. Despite the decrease/closure of sulphide massive deposits mining exploitation (e.g., Sao Domingos, Las Herrerias) during the second half of the 20th century, results showed ongoing input of Pb,Cu, As, Hg and Zn to coastal sediments. Thus, the legacy of contamination by these elements, mainly from leaching of slags and tailings, and remobilization/reworking of contaminated estuarine sediments, is still recorded in marine sediments. (C) 2016 Elsevier B.V. All rights reserved.
dc.identifier.doi10.1016/j.scitotenv.2016.07.143
dc.identifier.issn0048-9697
dc.identifier.urihttp://hdl.handle.net/10400.1/9210
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationHigh-resolution oceanic paleoproductivity and environmental changes. Correlation with fish populations.
dc.relation.isbasedonWOS:000383930400121
dc.titleFootprint of roman and modern mining activities in a sediment core from the southwestern Iberian Atlantic shelf
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleHigh-resolution oceanic paleoproductivity and environmental changes. Correlation with fish populations.
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/PDCT/PDCT%2FMAR%2F55618%2F2004/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-CLI%2F100157%2F2008/PT
oaire.citation.endPage1221
oaire.citation.startPage1211
oaire.citation.titleScience of the Total Environment
oaire.citation.volume571
oaire.fundingStreamPDCT
oaire.fundingStream5876-PPCDTI
person.familyNameNaughton
person.givenNameFilipa
person.identifierR-000-JPJ
person.identifier.ciencia-id1419-F239-1CEA
person.identifier.orcid0000-0002-3055-9396
person.identifier.ridE-7659-2013
person.identifier.scopus-author-id23009659300
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication.latestForDiscovery53f17112-41aa-4bd9-a437-50736dbde6f9
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