| Registro completo |
| Provedor de dados: |
5
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| País: |
France
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| Título: |
Shell of the Great Scallop Pecten maximus as a high-frequency archive of paleoenvironmental changes - art. no. Q08001
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| Autores: |
Chauvaud, Laurent
Lorrain, Anne
Dunbar, Robert
Paulet, Yves
Thouzeau, Gérard
Jean, Frédéric
Guarini, Jean-marc
Mucciarone, David
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| Data: |
2005-10
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| Ano: |
2005
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| Palavras-chave: |
Pecten Maximus
Brittany
Paleoenvironment
Estimation
Daily varition
Water temperature
Isotope
Calcite
Shell
Ëecten maximus
Paleotempérature
Variation saisonnière
Température eau
Strie croissance
Isotope
Coquille
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| Resumo: |
We investigate the environmental and biological controls on oxygen isotope ratios in the shells of modern Pecten maximus bivalves collected alive in the Bay of Brest (France). Seasonal delta(18)O profiles, obtained by drilling the daily calcite ridges deposited at the surface of the left valve, were compared with in situ measurements of temperature and salinity. We show that P. maximus delta(18)O values accurately track seasonal variations in bottom water temperature. Shell growth rate has no significant effect on shell delta(18)O values. Our study demonstrates that daily variations in water temperature can be reconstructed within about 0.5 degrees C. Temperatures estimated with the paleotemperature equation established in this study were compared with temperatures derived from previously published equations. The comparison indicates that the most commonly used paleotemperature equation for biogenic calcite (Epstein et al., 1953) provides inaccurate temperature estimates, but the Kim and O'Neil (1997) equation, established from abiogenic calcite precipitation, provides results very similar to ours and should therefore be used for scallop individuals coming from populations where proper empirical calibration cannot be done. Pecten maximus bivalves precipitate calcite in isotopic equilibrium with seawater, produce large daily growth striae, are stenohaline, and are well preserved in archeological and geological deposits, making them an excellent high-frequency archive of paleoenvironmental change.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2005/publication-643.pdf
DOI:10.1029/2004GC000890
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| Editor: |
AGU
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| Relação: |
http://archimer.ifremer.fr/doc/00000/643/
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| Formato: |
application/pdf
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| Fonte: |
Geochemistry, Geophysics, and Geosystems (1525-2027) (AGU), 2005-10 , Vol. 6 , P. NIL_1-NIL_15
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| Direitos: |
2005 by the American Geophysical Union
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