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Chronology of the sedimentary processes during the postglacial sea level rise in two estuaries of the Algarve coast, Southern Portugal

2008Journal article Restricted access
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dc.contributor.authorBoski, T.
dc.contributor.authorCamacho, Sarita
dc.contributor.authorMoura, Delminda
dc.contributor.authorFletcher, William
dc.contributor.authorWilamowski, A.
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorCorreia, Victor
dc.contributor.authorLoureiro, C.
dc.contributor.authorSantana, Paulo
dc.date.accessioned2013-03-26T14:02:00Z
dc.date.available2013-03-26T14:02:00Z
dc.date.issued2008
dc.description.abstractFour profiles of estuarine sediments obtained from boreholes drilled in the Algarve, Southern Portugal were studied in order to reconstruct the process of sediment accumulation driven by the postglacial sea level rise. In addition to the sedimentological analysis, the Foraminifera Index of Marine Influence (FIMI) permitted assessment of the nature and organization of sedimentary facies in the BelicheeGuadiana and Gilão-Almargem estuaries. The Beliche- Guadiana CM5 and Almargem G2 profiles accumulated in a sheltered environment, with the former presenting an almost continuous record of the sea level rise since ca 13 000 cal yr BP. The G1 and G3 profiles from the Gilão-Almargem area represent a more discontinuous record of the last 8000 years, which accumulated in the more dynamic environment of an outer estuary. The integration of all radiocarbon ages of dated levels, led to an estimate of sediment accumulation rates. Assuming a constant position of the sediment surface with respect to the tidal range and a negligible compaction of sediment, the sea level rose at the rate of 7 mm yr ^-1 in the period from 13 000 to 7500 cal yr BP. This process slowed down to ca 0.9 mm yr 1 from 7500 cal yr BP until the present. The marked historical change in the rate of sediment accumulation in these estuaries also occurred with the accumulation of organic matter and is, therefore, important data for global biogeochemical models of carbon. The main obstacle to obtain higher temporal resolution of the sedimentary processes was the intense anaerobic respiration of organic matter via sulphate reduction, which did not allow any accumulation of peat and, furthermore, led to erasure of the palaeontological record by acid formed from the subsequent oxidation of sulphides.por
dc.description.sponsorshipFORMOSE- Sources and Retention of Organic Matter in the Estuarine Zones, PRAXIS XXI program of Portuguese Science and Technology Foundation and project MEGASIG, INTERREG IIIa program of the European Union.por
dc.identifier.doihttp://dx.doi.org/10.1016/j.ecss.2007.09.012
dc.identifier.otherAUT: DMO00293; TBO00513;
dc.identifier.urihttp://hdl.handle.net/10400.1/2631
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectSea level risepor
dc.subjectSedimentary recordpor
dc.subjectEstuarypor
dc.subjectForaminiferapor
dc.subjectGulf of Cadizpor
dc.subjectCarbon cyclepor
dc.subjectClimate changepor
dc.titleChronology of the sedimentary processes during the postglacial sea level rise in two estuaries of the Algarve coast, Southern Portugalpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage244por
oaire.citation.startPage230por
oaire.citation.titleEstuarine Coastal and Shelf Sciencepor
oaire.citation.volume77por
person.familyNameBoski
person.familyNameCamacho
person.familyNameMoura
person.familyNameVeiga-Pires
person.familyNameLoureiro
person.givenNameTomasz
person.givenNameSarita
person.givenNameDelminda
person.givenNameCristina
person.givenNameCarlos
person.identifier113325
person.identifier453264
person.identifier.ciencia-id1416-B317-51D1
person.identifier.ciencia-id9B1A-D006-F736
person.identifier.ciencia-id4A1F-CEDA-E66C
person.identifier.ciencia-id011D-31BD-C6B6
person.identifier.orcid0000-0003-2462-4179
person.identifier.orcid0000-0002-2986-7156
person.identifier.orcid0000-0002-0952-6805
person.identifier.orcid0000-0002-9323-0723
person.identifier.orcid0000-0003-3117-3492
person.identifier.ridE-9559-2015
person.identifier.ridB-5144-2008
person.identifier.ridU-9863-2018
person.identifier.scopus-author-id6602267486
person.identifier.scopus-author-id15048413000
person.identifier.scopus-author-id7801372905
person.identifier.scopus-author-id23667861200
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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