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dc.contributor.authorRodrigues, Sara
dc.contributor.authorHernández-Molina, F. J.
dc.contributor.authorHillenbrand, C.-D.
dc.contributor.authorLucchi, Renata Giulia
dc.contributor.authorRodríguez-Tovar, F. J.
dc.contributor.authorRebesco, M.
dc.contributor.authorLarter, R.D.
dc.date.accessioned2022-06-07T07:26:32Z
dc.date.available2022-06-07T07:26:32Z
dc.date.issued2022-02-01
dc.description.abstractInterplay of deep-water sedimentary processes is responsible for building a myriad of features and deposits across mixed turbidite–contourite systems, from <5 cm beds to >200 km long sedimentary drifts. Investigations of the spatial and temporal variability of their sedimentary facies and facies associations is crucial to reveal the dynamics between along-slope bottom currents and down-slope turbidity currents, as well as their impact on drift construction and channel erosion. This study focuses on extensive modern mixed (turbidite–contourite) systems, developed across the continental rise of the Pacific margin of the Antarctic Peninsula. Nine sediment cores were sampled and analysed, through grain size and geochemical methods, to study the sedimentary facies at high-resolution (ca. 1 to 20 cm). Three main facies associations have been identified across distinct morphological features (i.e. mounded drifts and trunk channels), comprising intercalations of hemipelagites, bottom current reworked sands (which include fine to coarse-grained contourites) and gravitational facies (turbidites and mass-transport deposits). These facies associations reflect fluctuations of the background sedimentation, oscillations of the bottom-current velocity and of the frequency of gravity-driven currents. The sedimentary record features cyclic alternations during the Late Quaternary (>99 kyr), suggesting that variations between along-slope bottom currents and down-slope turbidity currents are strongly linked to glacial–interglacial cycles during Marine Isotope Stages 1 to 6. Sedimentary records affected by bottom currents on polar margins, such as those of the Antarctic Peninsula, are essential to decipher the facies and facies sequences of bottom-current deposits, as the low degree of bioturbation throughout most of the sediments allows us to observe the original sedimentary structures, which are poorly preserved in similar deposits from other continental margins.en_US
dc.identifier.citationRodrigues S, Hernández-Molina FJ, Hillenbrand C, Lucchi RG, Rodríguez-Tovar, Rebesco M, Larter. Recognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsula. Sedimentology. 2022:1-65en_US
dc.identifier.cristinIDFRIDAID 1997264
dc.identifier.doi10.1111/sed.12978
dc.identifier.issn0037-0746
dc.identifier.issn1365-3091
dc.identifier.urihttps://hdl.handle.net/10037/25380
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalSedimentology
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2022 The Author(s)en_US
dc.titleRecognizing key sedimentary facies and their distribution in mixed turbidite–contourite depositional systems: The case of the Pacific margin of the Antarctic Peninsulaen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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