Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Registro completo
Provedor de dados:  5
País:  France
Título:  The silicon isotope composition of Ethmodiscus rex laminated diatom mats from the tropical West Pacific: Implications for silicate cycling during the Last Glacial Maximum
Autores:  Xiong, Zhifang
Li, Tiegang
Algeo, Thomas
Doering, Kristin
Frank, Martin
Brzezinski, Mark A.
Chang, Fengming
Opfergelt, Sophie
Crosta, Xavier
Jiang, Fuqing
Wan, Shiming
Zhai, Bin
Data:  2015-07
Ano:  2015
Resumo:  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 (delta Si-30(E.rex)) from two sediment cores in the Parece Vela Basin of the EPS. In the study cores, delta Si-30(E.rex) varies from -1.23 parts per thousand to -0.83 parts per thousand (average -1.04 parts per thousand), a range that is atypical of marine diatom delta Si-30 and that corresponds to the lower limit of reported diatom delta Si-30 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 similar to 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.
Tipo:  Text
Idioma:  Inglês
Identificador:  https://archimer.ifremer.fr/doc/00496/60732/65231.pdf

DOI:10.1002/2015PA002793

https://archimer.ifremer.fr/doc/00496/60732/
Editor:  Amer Geophysical Union
Formato:  application/pdf
Fonte:  Paleoceanography (0883-8305) (Amer Geophysical Union), 2015-07 , Vol. 30 , N. 7 , P. 803-823
Direitos:  info:eu-repo/semantics/openAccess

restricted use
Fechar
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional