Universidad Peruana Cayetano Heredia

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

Mostrar el registro sencillo del ítem

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


Ficheros en el ítem

Ficheros Tamaño Formato Ver

No hay ficheros asociados a este ítem.

Este ítem aparece en la(s) siguiente(s) colección(ones)

Mostrar el registro sencillo del ítem

info:eu-repo/semantics/restrictedAccess Excepto si se señala otra cosa, la licencia del ítem se describe como info:eu-repo/semantics/restrictedAccess

Buscar en el Repositorio


Listar

Panel de Control

Estadísticas