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dc.contributor.authorChannell, J. E. T.
dc.contributor.authorHarrison, R. J.
dc.contributor.authorLascu, I.
dc.contributor.authorMcCave, I. N.
dc.contributor.authorHibbert, F. D.
dc.contributor.authorAustin, W. E. N.
dc.identifier.citationChannell , J E T , Harrison , R J , Lascu , I , McCave , I N , Hibbert , F D & Austin , W E N 2016 , ' Magnetic record of deglaciation using FORC-PCA, sortable-silt grain size, and magnetic excursion at 26 ka, from the Rockall Trough (NE Atlantic) ' Geochemistry, Geophysics, Geosystems , vol. 17 , no. 5 , pp. 1823-1841 .
dc.identifier.otherPURE: 242360482
dc.identifier.otherPURE UUID: 914e96b4-7ed0-4347-a32c-492c369b1764
dc.identifier.otherBibtex: urn:bfcdaf53eb8b1e940ef74cb465366ba3
dc.identifier.otherScopus: 84976538779
dc.descriptionResearch supported by US NSF grants 0850413 and 1014506, and the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013) / ERC Grant Agreement No. 320750. The UK NERC and BGS funded the recovery of Core MD04-2822.en
dc.description.abstractCore MD04-2822 from the Rockall Trough has apparent sedimentation rates of ∼ 1 m/kyr during the last deglaciation (Termination I). Component magnetization directions indicate a magnetic excursion at 16.3 m depth in the core, corresponding to an age of 26.5 ka, implying an excursion duration of ∼350 years. Across Termination I, the mean grain size of sortable silt implies reduced bottom-current velocity in the Younger Dryas and Heinrich Stadial (HS)-1A, and increased velocities during the Bølling-Allerød warm period. Standard bulk magnetic parameters imply fining of magnetic grain size from the mid-Younger Dryas (∼12 ka) until ∼ 8 ka. First-order reversal curves (FORCs) were analyzed using ridge extraction to differentiate single domain (SD) from background (detrital) components. Principal component analysis (FORC-PCA) was then used to discriminate three end members corresponding to SD, pseudo-single domain (PSD) and multidomain (MD) magnetite. The fining of bulk magnetic grain size from 12 to 8 ka is due to reduction in concentration of detrital (PSD+MD) magnetite, superimposed on a relatively uniform concentration of SD magnetite produced by magnetotactic bacteria. The decrease in PSD+MD magnetite concentration from 12 to 8 ka is synchronized with increase in benthic δ13C, and with major (∼70 m) regional sea-level rise, and may therefore be related to detrital sources on the shelf that had reduced influence as sea level rose, and to bottom-water reorganization as Northern Source Water (NSW) replaced Southern Source Water (SSW).
dc.relation.ispartofGeochemistry, Geophysics, Geosystemsen
dc.rights© 2016. American Geophysical Union. All Rights Reserved. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at
dc.subjectMagnetic granulometryen
dc.subjectFORC-PCA analysisen
dc.subjectSortable silten
dc.subjectMagnetic excursionen
dc.subjectTermination Ien
dc.subjectRockall Troughen
dc.subjectGE Environmental Sciencesen
dc.titleMagnetic record of deglaciation using FORC-PCA, sortable-silt grain size, and magnetic excursion at 26 ka, from the Rockall Trough (NE Atlantic)en
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.Geography & Sustainable Developmenten
dc.contributor.institutionUniversity of St Andrews.Marine Alliance for Science & Technology Scotlanden
dc.contributor.institutionUniversity of St Andrews.Scottish Oceans Instituteen
dc.contributor.institutionUniversity of St Andrews.St Andrews Sustainability Instituteen
dc.description.statusPeer revieweden

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