Mostrar el registro sencillo del ítem

The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum

dc.rights.licenseopenen_US
dc.contributor.authorXIONG, Zhifang
dc.contributor.authorLI, Tiegang
hal.structure.identifierDepartment of Geology
dc.contributor.authorALGEO, Thomas
dc.contributor.authorDOERING, Kristin
hal.structure.identifierRheinisch-Westfälische Technische Hochschule Aachen University [RWTH]
dc.contributor.authorFRANK, Martin
hal.structure.identifierMarine Science Institute [Santa Barbara] [MSI]
dc.contributor.authorBRZEZINSKI, Mark
dc.contributor.authorCHANG, Fengming
hal.structure.identifierSoil Science Unit
dc.contributor.authorOPFERGELT, Sophie
hal.structure.identifierEnvironnements et Paléoenvironnements OCéaniques [EPOC]
dc.contributor.authorCROSTA, Xavier
dc.contributor.authorJIANG, Fuqing
dc.contributor.authorWAN, Shiming
dc.contributor.authorZHAI, Bin
dc.date.accessioned2024-06-19T08:34:01Z
dc.date.available2024-06-19T08:34:01Z
dc.date.issued2015-07
dc.identifier.issn0883-8305en_US
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/200572
dc.description.abstractEnThe cause of massive blooms of Ethmodiscus rex laminated diatom mats (LDMs) in the eastern Philippine Sea (EPS) during the Last Glacial Maximum (LGM) remains uncertain. In order to better understand the mechanism of formation of E. rex LDMs from the perspective of dissolved silicon (DSi) utilization, we determined the silicon isotopic composition of single E. rex diatom frustules (δ 30 Si E. rex) from two sediment cores in the Parece Vela Basin of the EPS. In the study cores, δ 30 Si E. rex varies from À1.23‰ to À0.83‰ (average À1.04‰), a range that is atypical of marine diatom δ 30 Si and that corresponds to the lower limit of reported diatom δ 30 Si values of any age. A binary mixing model (upwelled silicon versus eolian silicon) accounting for silicon isotopic fractionation during DSi uptake by diatoms was constructed. The binary mixing model demonstrates that E. rex dominantly utilized DSi from eolian sources (i.e., Asian dust) with only minor contributions from upwelled seawater sources (i.e., advected from Subantarctic Mode Water, Antarctic Intermediate Water, or North Pacific Intermediate Water). E. rex utilized only ~24% of available DSi, indicating that surface waters of the EPS were eutrophic with respect to silicon during the LGM. Our results suggest that giant diatoms did not always use a buoyancy strategy to obtain nutrients from the deep nutrient pool, thus revising previously proposed models for the formation of E. rex LDMs.
dc.language.isoENen_US
dc.title.enThe silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum
dc.typeArticle de revueen_US
dc.identifier.doi10.1002/2015PA002793en_US
dc.subject.halPlanète et Univers [physics]/Océan, Atmosphèreen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Océanographieen_US
dc.subject.halPlanète et Univers [physics]/Sciences de la Terre/Climatologieen_US
bordeaux.journalPaleoceanographyen_US
bordeaux.page803-823en_US
bordeaux.volume30en_US
bordeaux.hal.laboratoriesEPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805en_US
bordeaux.issue7en_US
bordeaux.institutionUniversité de Bordeauxen_US
bordeaux.institutionCNRSen_US
bordeaux.teamPALEOen_US
bordeaux.peerReviewedouien_US
bordeaux.inpressnonen_US
bordeaux.import.sourcehal
hal.identifierhal-02105557
hal.version1
hal.popularnonen_US
hal.audienceInternationaleen_US
hal.exportfalse
workflow.import.sourcehal
dc.rights.ccPas de Licence CCen_US
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Paleoceanography&rft.date=2015-07&rft.volume=30&rft.issue=7&rft.spage=803-823&rft.epage=803-823&rft.eissn=0883-8305&rft.issn=0883-8305&rft.au=XIONG,%20Zhifang&LI,%20Tiegang&ALGEO,%20Thomas&DOERING,%20Kristin&FRANK,%20Martin&rft.genre=article


Archivos en el ítem

Thumbnail
Nombre:
Xiong_Paleoceanography2015.pdf
Tamaño:
5.214Mb
Formato:
PDF
Ver/Abrir

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

Mostrar el registro sencillo del ítem