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Incised valleys on the Algarve inner shelf, northern Gulf of Cadiz margin: stratigraphic architecture and controlling factors in a low fluvial supply setting

2023-09Journal article Open access
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dc.contributor.authorCarrión-Torrente, Álvaro
dc.contributor.authorLobo, Francisco José
dc.contributor.authorPuga-Bernabéu, Ángel
dc.contributor.authorLuján, María
dc.contributor.authorMendes, Isabel
dc.contributor.authorHanebuth, Till J. J.
dc.contributor.authorLebreiro, Susana
dc.contributor.authorGarcía, Marga
dc.contributor.authorReguera, María Isabel
dc.contributor.authorAntón, Laura
dc.contributor.authorVan Rooij, David
dc.contributor.authorCerrillo-Escoriza, Javier
dc.date.accessioned2023-11-07T10:34:14Z
dc.date.available2023-11-07T10:34:14Z
dc.date.issued2023-09
dc.description.abstractA network of cross-shelf paleovalleys has been recognized over the paleo-inner shelf off the Gila & SIM;o-Almargem Estuary, a small fluvial drainage system that presently receives minor sediment supply in the eastern Algarve shelf, northern margin of the Gulf of Cadiz (SW Iberian Peninsula). This study is aimed at determining the driving controls that triggered substantially different paleohydrological conditions and sedimentary dynamics of ancient fluvial systems in this margin. We focus on evidences of secondary controls on valley genesis and evolution, superimposed to primary glacio-eustatic control such as antecedent geology, low fluvial supply and changing hydrodynamic regimes. The architecture and spatial distribution of these paleovalleys were interpreted based on a grid of seismic profiles with different resolutions. Likewise, a sediment core obtained in a distal position of the paleovalley system provided information about sedimentary processes during the most recent stage of valley infilling. The chronostratigraphic framework was constructed based on regional seismic horizons defined in previous studies and complemented with two AMS 14C dates obtained from bivalve shells.The inner shelf paleovalley system is composed of several incised valley features which exhibit a remarkable similar internal architecture. These inner valley features exhibit two major incision phases (from oldest to youngest; IP 2 and IP 1) that are thought to constitute a simple paleovalley system formed during the last glacial cycle. The origins of the incision are considered to be different. The older one is related to fluvial incision during the sea-level fall leading into the Last Glacial Maximum, whereas the recent one is interpreted as the result of tidal scour during the postglacial transgression. Their corresponding infillings are interpreted, respectively, as estuarine bay-fill deposits and estuary-mouth sands. Overlying the paleovalley infilling, a distinctive reflective unit is in agreement with the generation of coastal barriers and related depositional systems.The formation of the paleo-inner-shelf paleovalley system was strongly conditioned by antecedent geology, which strongly limited the generation of wide incised valleys and determined the amount of incision landward of a well-defined break of slope. Its postglacial infilling was mainly estuarine in nature, likely involving the development of a dendritic system, with numerous barriers interrupted by tidal inlets and channels in a mixed estuarine system with low fluvial supply.pt_PT
dc.description.sponsorshipResearch projects CGL2011-30302-C02-02 and PID2021-125489OB-I00, supported by Spanish Ministries of Economy and Competitiveness and Science and Innovation. LA/P/0069/2020pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.csr.2023.105095pt_PT
dc.identifier.eissn1873-6955
dc.identifier.urihttp://hdl.handle.net/10400.1/20133
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationCentre for Marine and Environmental Research (CIMA)
dc.relationNot Available
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectGulf of Cadizpt_PT
dc.subjectSeismic stratigraphypt_PT
dc.subjectPaleovalleyspt_PT
dc.subjectContinental shelfpt_PT
dc.subjectFluvial incisionpt_PT
dc.subjectTidal inletspt_PT
dc.titleIncised valleys on the Algarve inner shelf, northern Gulf of Cadiz margin: stratigraphic architecture and controlling factors in a low fluvial supply settingpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre for Marine and Environmental Research (CIMA)
oaire.awardTitleNot Available
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F00350%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/DL 57%2F2016/DL 57%2F2016%2FCP1361%2FCT0009/PT
oaire.citation.startPage105095pt_PT
oaire.citation.titleContinental Shelf Researchpt_PT
oaire.citation.volume266pt_PT
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamDL 57/2016
person.familyNameMendes
person.givenNameIsabel Maria de Paiva Pinto
person.identifier.ciencia-id5C15-242C-FDC0
person.identifier.orcid0000-0001-7004-7910
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.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationc34b90c6-5a34-472c-a658-1d2329a59936
relation.isAuthorOfPublication.latestForDiscoveryc34b90c6-5a34-472c-a658-1d2329a59936
relation.isProjectOfPublication607b395b-b4ff-4b27-b6e4-779cdea78d97
relation.isProjectOfPublicationa87f37f0-1132-4e1b-b0c8-79ec4ffdfc9e
relation.isProjectOfPublication.latestForDiscovery607b395b-b4ff-4b27-b6e4-779cdea78d97

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