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.license | open | en_US |
| dc.contributor.author | XIONG, Zhifang | |
| dc.contributor.author | LI, Tiegang | |
| hal.structure.identifier | Department of Geology | |
| dc.contributor.author | ALGEO, Thomas | |
| dc.contributor.author | DOERING, Kristin | |
| hal.structure.identifier | Rheinisch-Westfälische Technische Hochschule Aachen University [RWTH] | |
| dc.contributor.author | FRANK, Martin | |
| hal.structure.identifier | Marine Science Institute [Santa Barbara] [MSI] | |
| dc.contributor.author | BRZEZINSKI, Mark | |
| dc.contributor.author | CHANG, Fengming | |
| hal.structure.identifier | Soil Science Unit | |
| dc.contributor.author | OPFERGELT, Sophie | |
| hal.structure.identifier | Environnements et Paléoenvironnements OCéaniques [EPOC] | |
| dc.contributor.author | CROSTA, Xavier | |
| dc.contributor.author | JIANG, Fuqing | |
| dc.contributor.author | WAN, Shiming | |
| dc.contributor.author | ZHAI, Bin | |
| dc.date.accessioned | 2024-06-19T08:34:01Z | |
| dc.date.available | 2024-06-19T08:34:01Z | |
| dc.date.issued | 2015-07 | |
| dc.identifier.issn | 0883-8305 | en_US |
| dc.identifier.uri | https://oskar-bordeaux.fr/handle/20.500.12278/200572 | |
| dc.description.abstractEn | The 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.iso | EN | en_US |
| dc.title.en | 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.type | Article de revue | en_US |
| dc.identifier.doi | 10.1002/2015PA002793 | en_US |
| dc.subject.hal | Planète et Univers [physics]/Océan, Atmosphère | en_US |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Océanographie | en_US |
| dc.subject.hal | Planète et Univers [physics]/Sciences de la Terre/Climatologie | en_US |
| bordeaux.journal | Paleoceanography | en_US |
| bordeaux.page | 803-823 | en_US |
| bordeaux.volume | 30 | en_US |
| bordeaux.hal.laboratories | EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805 | en_US |
| bordeaux.issue | 7 | en_US |
| bordeaux.institution | Université de Bordeaux | en_US |
| bordeaux.institution | CNRS | en_US |
| bordeaux.team | PALEO | en_US |
| bordeaux.peerReviewed | oui | en_US |
| bordeaux.inpress | non | en_US |
| bordeaux.import.source | hal | |
| hal.identifier | hal-02105557 | |
| hal.version | 1 | |
| hal.popular | non | en_US |
| hal.audience | Internationale | en_US |
| hal.export | false | |
| workflow.import.source | hal | |
| dc.rights.cc | Pas de Licence CC | en_US |
| bordeaux.COinS | ctx_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 |
