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Sea-level rise and anthropogenic activities recorded in the late Pleistocene/Holocene sedimentary infill of the Guadiana Estuary (SW Iberia)

2012Journal article Restricted access
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dc.contributor.authorDelgado, J.
dc.contributor.authorBoski, T.
dc.contributor.authorNieto, J. M.
dc.contributor.authorPereira, L.
dc.contributor.authorMoura, Delminda
dc.contributor.authorGomes, A.I.
dc.contributor.authorMendes da Silva de Sousa, Carlos A
dc.contributor.authorGarcía-Tenorio, R.
dc.date.accessioned2013-03-01T15:55:03Z
dc.date.available2013-03-01T15:55:03Z
dc.date.issued2012
dc.description.abstractThis study reviews data on sea-level rise during the last 13000 yr cal. BP (13 kyr) as recorded in the estuarine sediments of the Guadiana River (SE Portugal, SW Spain). We combined new data from a 63 m-long borehole, drilled through the entire postglacial sedimentary sequence, with information on five previously studied cores. By integrating sedimentological, geochemical and palaeontological proxies, we were able to make a palaeoenvironmental reconstruction of the Guadiana terminal palaeovalley during the last 13 kyr and propose a curve of sea-level rise for the SW Iberian Atlantic margin. Our foraminifera-based palaeoecological reconstruction, anchored to a 14C age model, reveals rapid sea-level rise from 13 kyr, interrupted during the Younger Dryas and resuming ca 11.5 kyr. The pace of marine transgression slackened ca. 7.5 kyr and since then has progressed upwards at a rate of 1.2 mm yr 1. HoloceneeAnthropocene sediments from two boreholes were also analysed to assess the timing, levels and sources of trace metals produced by acid mine drainage from the Iberian Pyrite Belt. Study of metal/aluminium ratios through the profiles allowed background metal concentrations to be estimated from lithostratigraphic units older than ca. 5 kyr (i.e. unaffected by anthropogenic activities). Human activities are especially evident from 4.5 kyr (the beginning of the Copper Age), with anthropogenic sources of metal fluxes prevailing over natural sources (especially Pb, Co, Ni, and Mn, and, to a lesser extent, Zn, Cu, and Ni). Mining activities became particularly intensive between the late Bronze Age and the Roman period (3e1.5 kyr), when the highest metal enrichment factors were recorded: EFPb z 2, EFCd > 10, EFCr z 2, EFCu z 3, EFZn ¼ 1.4.This study reveals the utility of postglacial sedimentary records for reconstructing historical changes in regional water-sediment quality and separating natural and anthropogenic sources of geochemical contaminants.por
dc.description.sponsorshipEuropean Union POCTEP program RISE project, Portuguese Science Foundation (EVEDUS project) and Ph.D. grant from the Huelva Universitypor
dc.identifier.doihttp://dx.doi.org/10.1016/j.quascirev.2011.12.002
dc.identifier.otherAUT: DMO00293; TBO00513; CGS00198 ASG02249;
dc.identifier.urihttp://hdl.handle.net/10400.1/2522
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectLate Pleistocenepor
dc.subjectHolocenepor
dc.subjectSea-level risepor
dc.subjectGeochemical recordpor
dc.subjectGuadiana Estuarypor
dc.subjectIberian Pyrite Beltpor
dc.titleSea-level rise and anthropogenic activities recorded in the late Pleistocene/Holocene sedimentary infill of the Guadiana Estuary (SW Iberia)por
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage141por
oaire.citation.startPage121por
oaire.citation.titleQuaternary Science Reviewspor
oaire.citation.volume33por
person.familyNameBoski
person.familyNameMoura
person.familyNameGomes
person.familyNameMendes da Silva de Sousa
person.givenNameTomasz
person.givenNameDelminda
person.givenNameAna
person.givenNameCarlos A
person.identifier.ciencia-id1416-B317-51D1
person.identifier.ciencia-id331B-BA33-96A6
person.identifier.ciencia-idBF10-E2DF-06BB
person.identifier.orcid0000-0003-2462-4179
person.identifier.orcid0000-0002-0952-6805
person.identifier.orcid0000-0002-9793-4816
person.identifier.orcid0000-0003-4616-2278
person.identifier.ridC-3969-2015
person.identifier.scopus-author-id6602267486
person.identifier.scopus-author-id15048413000
person.identifier.scopus-author-id56346514200
person.identifier.scopus-author-id37015016500
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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