| Registro completo |
| Provedor de dados: |
ArchiMer
|
| 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
|
|
