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Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean

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dc.contributor.author Cortina, Aleix
dc.contributor.author Filippelli, Gabriel
dc.contributor.author Ochoa, Diana
dc.contributor.author Javier Sierro, Francisco
dc.contributor.author Flores, Jose-Abel
dc.contributor.author Grimalt, Joan O.
dc.date.accessioned 2018-11-30T23:41:32Z
dc.date.available 2018-11-30T23:41:32Z
dc.date.issued 2018
dc.identifier.uri https://hdl.handle.net/20.500.12866/4224
dc.description.abstract The burial of phosphorus (P) in continental margin sediments is a critical component of the marine reactive P budget, and thus an important factor in marine biological productivity. We determined downcore records of P from a site drilled on the upper slope of the Gulf of Lions (PRGL 1), northwestern Mediterranean Sea. Changes in total P content were monitored from Marine Isotope Stage (MIS) 6 to MIS 11. In addition, in two selected intervals (248-277 ka and 306-342 ka) the total P record was expanded by adding detailed geochemical analyses of the various P fractions, including oxyhydroxide-associated P, authigenic P, detrital P and organic P. Increased sedimentation rates during glacials owing to seaward migration of the Rhone's mouth, enhanced the burial of reactive P (oxyhydroxide-associated + authigenic + organic) phases by decreasing its time at the reactive sediment/water interface, in turn resulting in increasing proportion of authigenic to detrital phosphorus. The inverse was found for interglacial stages. The effects of glacial/interglacial variation in sedimentation rate over P geochemistry resulted in changes in sediment-water interface oxygenation, as well as in the efficiency of P burial, as shown by (C:P)(org) and C-org:P-react proxies respectively. Two events of high P deposition associated with authigenic (P-aut1) formation, at 335 (P-aut2) and 275 ka (P0052), were associated with periods of rapid disintegration of North Atlantic ice sheets leading to Ice Rafted Debris (IRD) deposition. These high P deposition events appear to be linked to short warm periods that followed cold episodes. Enhanced continental runoff owing to more humid conditions during short warm episodes could play a critical role for enhanced biogenic productivity and posterior authigenic P accumulation. en_US
dc.language.iso eng
dc.publisher Elsevier
dc.relation.ispartofseries Palaeogeography, Palaeoclimatology, Palaeoecology
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject biogeochemistry en_US
dc.subject biological production en_US
dc.subject burial (geology) en_US
dc.subject climate variation en_US
dc.subject continental margin en_US
dc.subject Gulf of Lion en_US
dc.subject Gulf of lions en_US
dc.subject marine isotope stage en_US
dc.subject Mediterranean Sea en_US
dc.subject Mediterranean Sea (Northwest) en_US
dc.subject MIS 8 en_US
dc.subject oxygenation en_US
dc.subject paleoproductivity en_US
dc.subject Paleoredox en_US
dc.subject phosphorus en_US
dc.subject Phosphorus paleoproductivity en_US
dc.subject redox conditions en_US
dc.subject sediment-water interface en_US
dc.subject sedimentation rate en_US
dc.subject Termination IV en_US
dc.title Climate-driven changes in sedimentation rate influence phosphorus burial along continental margins of the northwestern Mediterranean en_US
dc.type info:eu-repo/semantics/article
dc.identifier.doi https://doi.org/10.1016/j.palaeo.2018.03.010
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.03
dc.subject.ocde https://purl.org/pe-repo/ocde/ford#1.05.11
dc.relation.issn 1872-616X


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