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The Late Pleistocene-Holocene sedimentary evolution of the Sines Contourite Drift (SW Portuguese Margin): A multiproxy approach

2020-09Journal article Restricted access
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dc.contributor.authorTeixeira, Manuel
dc.contributor.authorTerrinha, Pedro
dc.contributor.authorRoque, Cristina
dc.contributor.authorVoelker, Antje
dc.contributor.authorSilva, Pedro
dc.contributor.authorSalgueiro, Emilia
dc.contributor.authorAbrantes, Fatima
dc.contributor.authorNaughton, Filipa
dc.contributor.authorMena, Anxo
dc.contributor.authorErcilla, Gemma
dc.contributor.authorCasas, David
dc.date.accessioned2021-06-24T11:35:19Z
dc.date.available2021-06-24T11:35:19Z
dc.date.issued2020-09
dc.description.abstractThe Sines Contourite Drift (SCD), located in the Alentejo margin, southwest Iberian continental margin, has been through many depositional phases in result of dimatic variations and bottom current oscillations, which determined a variable depositional pattern and an irregular sedimentary evolution since the Late Pleistocene. The SCD, being in the main path of the Mediterranean Outflow Water (MOW), which greatly constrains the sedimentary building of this drift, constitutes the distal part of the Gulf of Cadiz Contourite Depositional System and its sedimentary evolution therefore reflects the history of MOW variations. In order to investigate this, we report on a multiproxy analysis of grain-size, carbon content and physical, geochemical, and environmental-magnetic properties on the AMS C-14 dated 350-an long gravity core CO14-GC-07, retrieved in the SCD, at 1425 meters water depth (mwd). The main objective is to reconstruct the evolution of the sedimentary package of the SCD from >43 cal kyr BP to Present and bring new insights about the impact of bottom currents' activity on the morphosedimentary evolution of the margin. Results show the existence of four distinct depositional phases in response to climate variations and bottom current oscillations during the Late Pleistocene-Holocene. Phase 1 (350-322 cm: >42.9 cal kyr BP) occurred in Marine Isotope Stage (MIS) 3 and presents silty-muddy sediments with presence of shell fragments and moderate bioturbation. Phase 2 (322-176 cm: >42.9-similar to 30.5 cal kyr BP), which lasted from middle MIS 3 to the onset of MIS 2, reveals sediment coarsening towards the top limit, suggesting climate cooling and strong bottom current winnowing. Phase 3 (176-144 cm: similar to 30.5-17.1 cal kyr BP) covers most of MIS 2 prior to the last deglaciation and shows the sharpest variations on all sediment properties and the coarsest sediment facies, with Fe-rich layers associated with the increase of lerrigenous input and sea-level regression that coincide with the enhancement of MOW. Phase 4 (144-0 cm: <17.1 cal kyr BP) is associated with the degladal sea-level rise and represents a calmer depositional environment with finer sediments and increasing contributions of biogenic material. The MOW is the most prominent bottom current and the most active seabed shaping agent in the study area, whose vertical shifting during glacial (similar to 800-2200 mwd) and interglacial (600-1500 mwd) periods is coincident with the most active morphosedimentary sector of the area, contributing to the development of landslide scars and sediment waves. (C) 2020 Elsevier B.V. All rights reserved.
dc.description.sponsorshipFCT (Fundacao para a Ciencia e a Tecnologia) -the Portuguese Foundation for Science and Technology [SFRH/BD/110674/2015]
dc.description.sponsorshipCONDRIBER [FCTPTDC/GEO/4430/2012]
dc.description.sponsorshipMOWER [CTM2012-39599-C03-02]
dc.description.sponsorshipPortuguese national funds from FCT - Foundation for Science and Technology [UIDB/04326/2020]
dc.description.sponsorshipLandmark Graphic Corporation
dc.description.sponsorshipFCTPortuguese Foundation for Science and TechnologyEuropean Commission [UIDB/GEO/50019/2020 -IDL, PTDC/CTA-GEO/30381/2017]
dc.description.sponsorshipFAUCES project [CTM201565461-C2-1-R]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1016/j.sedgeo.2020.105737
dc.identifier.issn0037-0738
dc.identifier.urihttp://hdl.handle.net/10400.1/16406
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.subjectSines contourite drift
dc.subjectSediment properties
dc.subjectLate pleistocene-holocene
dc.subjectMediterranean outflow water
dc.subjectClimate variations
dc.subject.otherGeology
dc.titleThe Late Pleistocene-Holocene sedimentary evolution of the Sines Contourite Drift (SW Portuguese Margin): A multiproxy approach
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage105737
oaire.citation.titleSedimentary Geology
oaire.citation.volume407
person.familyNameVoelker
person.familyNameSalgueiro
person.familyNameAbrantes
person.familyNameNaughton
person.givenNameAntje
person.givenNameEmilia
person.givenNameFatima
person.givenNameFilipa
person.identifier2315310
person.identifierR-000-JPJ
person.identifier.ciencia-idC11E-D8E6-CDFA
person.identifier.ciencia-id3B10-07FD-161C
person.identifier.ciencia-id021D-CA76-20D2
person.identifier.ciencia-id1419-F239-1CEA
person.identifier.orcid0000-0001-6465-6023
person.identifier.orcid0000-0003-1000-2977
person.identifier.orcid0000-0002-9110-0212
person.identifier.orcid0000-0002-3055-9396
person.identifier.ridC-5427-2012
person.identifier.ridG-1019-2013
person.identifier.ridB-5985-2013
person.identifier.ridE-7659-2013
person.identifier.scopus-author-id8784446000
person.identifier.scopus-author-id23486371200
person.identifier.scopus-author-id16030759200
person.identifier.scopus-author-id23009659300
rcaap.rightsrestrictedAccess
rcaap.typearticle
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