Universidad Peruana Cayetano Heredia
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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