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Provedor de dados:  5
País:  France
Título:  Sur l'origine des phosphates de l'atoll corallien de Nauru
Autores:  Bernat, M
Loubet, M
Baumer, A
Data:  1991
Ano:  1991
Palavras-chave:  PHOSPHATES ATOLLS ISOTOPES U
TH
SR
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.
Tipo:  Text
Idioma:  Francês
Identificador:  http://archimer.ifremer.fr/doc/00102/21374/18974.pdf
Editor:  Gauthier-Villars
Relação:  http://archimer.ifremer.fr/doc/00102/21374/
Formato:  application/pdf
Fonte:  Oceanologica Acta (0399-1784) (Gauthier-Villars), 1991 , Vol. 14 , N. 4 , P. 325-331
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