FN Archimer Export Format
PT J
TI Sur l'origine des phosphates de l'atoll corallien de Nauru
OT On the origin of phosphates from the nauru atoll
BT 
AF BERNAT, M
   LOUBET, M
   BAUMER, A
AS 1:;2:;3:;
FF 1:;2:;3:;
IF 0.662
TC 4
UR https://archimer.ifremer.fr/doc/00102/21374/18974.pdf
LA French
DT Article
DE ;PHOSPHATES;ATOLLS;ISOTOPES;U, TH, SR
AB 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.
PY 1991
SO Oceanologica Acta
SN 0399-1784
PU Gauthier-Villars
VL 14
IS 4
UT A1991GG20000002
BP 325
EP 331
ID 21374
ER

EF