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Magnetic record of deglaciation using FORC-PCA, sortable-silt grain size, and magnetic excursion at 26 ka, from the Rockall Trough (NE Atlantic)
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dc.contributor.author | Channell, J. E. T. | |
dc.contributor.author | Harrison, R. J. | |
dc.contributor.author | Lascu, I. | |
dc.contributor.author | McCave, I. N. | |
dc.contributor.author | Hibbert, F. D. | |
dc.contributor.author | Austin, W. E. N. | |
dc.date.accessioned | 2016-11-28T00:33:42Z | |
dc.date.available | 2016-11-28T00:33:42Z | |
dc.date.issued | 2016-05 | |
dc.identifier | 242360482 | |
dc.identifier | 914e96b4-7ed0-4347-a32c-492c369b1764 | |
dc.identifier | 84976538779 | |
dc.identifier | 000379525100015 | |
dc.identifier.citation | Channell , 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 . https://doi.org/10.1002/2016GC006300 | en |
dc.identifier.issn | 1525-2027 | |
dc.identifier.other | Bibtex: urn:bfcdaf53eb8b1e940ef74cb465366ba3 | |
dc.identifier.uri | https://hdl.handle.net/10023/9884 | |
dc.description | Research 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.abstract | Core 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.format.extent | 19 | |
dc.format.extent | 4534264 | |
dc.language.iso | eng | |
dc.relation.ispartof | Geochemistry, Geophysics, Geosystems | en |
dc.subject | Magnetic granulometry | en |
dc.subject | FORC-PCA analysis | en |
dc.subject | Sortable silt | en |
dc.subject | Magnetic excursion | en |
dc.subject | Termination I | en |
dc.subject | Rockall Trough | en |
dc.subject | GE Environmental Sciences | en |
dc.subject | NDAS | en |
dc.subject.lcc | GE | en |
dc.title | Magnetic record of deglaciation using FORC-PCA, sortable-silt grain size, and magnetic excursion at 26 ka, from the Rockall Trough (NE Atlantic) | en |
dc.type | Journal article | en |
dc.contributor.institution | University of St Andrews. Geography & Sustainable Development | en |
dc.contributor.institution | University of St Andrews. Marine Alliance for Science & Technology Scotland | en |
dc.contributor.institution | University of St Andrews. Scottish Oceans Institute | en |
dc.contributor.institution | University of St Andrews. St Andrews Sustainability Institute | en |
dc.identifier.doi | 10.1002/2016GC006300 | |
dc.description.status | Peer reviewed | en |
dc.date.embargoedUntil | 2016-11-27 |
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