Registro completo |
Provedor de dados: |
ArchiMer
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País: |
France
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Título: |
Sur l'origine des phosphates de l'atoll corallien de Nauru
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Autores: |
Bernat, M
Loubet, M
Baumer, A
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Data: |
1991
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Ano: |
1991
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Palavras-chave: |
PHOSPHATES ATOLLS ISOTOPES U
TH
SR
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Resumo: |
Phosphates from the Nauru atoll lie on a karstic structure developed at the expenses of a coral reef. These formations are fluorapatites low in carbonate, with less fluorine than common marine carbonate-fluorapatites (CFA). At least one of the deposits is from the last interglacial era (Th-230-U-234 dating). Rare Earth spectra seems to be affected by the dissolution-precipitation reactions leading to the formation of the carbonate-fluorapatite. But U and Sr isotopic ratios support the marine origin of most of these formations, except for one result, which give a Nd-143/Nd-144 ratio indicating a slight volcanic influence. Our results and the literature reports favorise the hypothesis that these phosphates originate from the endo-upwelling of phosphorus rich deep seawater through the fracturated and porous mass of the carbonated reef.
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Tipo: |
Text
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Idioma: |
Francês
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Identificador: |
http://archimer.ifremer.fr/doc/00102/21374/18974.pdf
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Editor: |
Gauthier-Villars
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Relação: |
http://archimer.ifremer.fr/doc/00102/21374/
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Formato: |
application/pdf
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Fonte: |
Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 4 , P. 325-331
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