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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 H. L.
dc.contributor.authorSilva, Pedro
dc.contributor.authorSalgueiro, Emília
dc.contributor.authorAbrantes, F
dc.contributor.authorNaughton, F.
dc.contributor.authorMena, Anxo
dc.contributor.authorErcilla, Gemma
dc.contributor.authorD.casas
dc.date.accessioned2020-10-07T15:40:02Z
dc.date.available2020-10-07T15:40:02Z
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.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationTEIXEIRA, Manuel; [et al] – The Late Pleistocene-Holocene sedimentary evolution of the Sines Contourite Drift (SW Portuguese Margin): A multiproxy approach. Sedimentary Geology. ISSN 0037-0738. Vol. 407 (2020), pp. 1-17pt_PT
dc.identifier.doi10.1016/j.sedgeo.2020.105737pt_PT
dc.identifier.issn0037-0738
dc.identifier.issn1879-0968
dc.identifier.urihttp://hdl.handle.net/10400.21/12280
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationSFRH/BD/110674/2015 - FCTpt_PT
dc.relationFCTPTDC/GEO/4430/2012 - CONDRIBERpt_PT
dc.relationCTM2012-39599-C03-02 - MOWERpt_PT
dc.relationUIDB/04326/2020 - FCTpt_PT
dc.relation.publisherversionhttps://reader.elsevier.com/reader/sd/pii/S0037073820301524?token=DB742BFD04288F7F00F5CED31DF24552AF7595C69883E02726D4214302DCB6779945A832835DA8F40FA72A50ADB27843pt_PT
dc.subjectSines Contourite Driftpt_PT
dc.subjectSediment propertiespt_PT
dc.subjectLate Pleistocene-Holocenept_PT
dc.subjectMediterranean Outflow Waterpt_PT
dc.subjectClimate variationspt_PT
dc.titleThe Late Pleistocene-Holocene sedimentary evolution of the Sines Contourite Drift (SW Portuguese Margin): A multiproxy approachpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage17pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleSedimentary Geologypt_PT
oaire.citation.volume407pt_PT
person.familyNameTeixeira
person.familyNameTerrinha
person.familyNameVoelker
person.familyNameSilva
person.familyNameCarvalho Salgueiro
person.familyNameAbrantes
person.familyNameNaughton
person.familyNameMena
person.familyNameErcilla
person.familyNameCASAS
person.givenNameManuel
person.givenNamePedro
person.givenNameAntje Helga Luise
person.givenNamePedro
person.givenNameMaria Emília
person.givenNameFatima
person.givenNameFilipa
person.givenNameAnxo
person.givenNameGemma
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person.identifierC-5427-2012
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person.identifierFilipa Naughton
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person.identifier.ridB-5764-2013
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person.identifier.scopus-author-id56182280700
person.identifier.scopus-author-id6507246919
person.identifier.scopus-author-id8784446000
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rcaap.rightsclosedAccesspt_PT
rcaap.typearticlept_PT
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