Remaniement des nannofossiles calcaires maastrichtiens dans les sédiments du Danien basal de Bidart (France) : arguments isotopiques (carbone et oxygène) |
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Authors: | Fabrice Minoletti Marc de Rafelis Maurice Renard Silvia Gardin |
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Institution: | Département de géologie sédimentaire, FR32 du CNRS « CEPAGE », université P. et M.-Curie, 4, place Jussieu, 75252 Paris cedex 05, France |
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Abstract: | The sediments at the Cretaceous-Tertiary boundary record a major crisis of pelagic carbonate producers (calcareous nannofossils and planktonic foraminifera). Nevertheless, Maastrichtian-like nannofossils are found in lowermost Danian sediments. Their origin (reworked vs. survivors) is still under debate. A recently developed protocol leading to separation of the various calcareous components included in the lowermost Danian sediments allows evaluation of the nannofossil isotopic signatures across the Cretaceous-Paleocene boundary. Maastrichtian-like nannofossils found in Danian sediments record isotopic ratios (carbon and oxygen) similar to the Cretaceous ones. These results provide evidence that Maastrichtian-like nannofossils are mostly reworked at Bidart. |
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Keywords: | Nannofossiles calcaires Limite Cré tacé -Tertiaire Isotopes stables Remaniement Bidart |
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