Morphométrie de nannofossiles calcaires au passage Crétacé-Paléocène des coupes de Bidart (France) et d'Elles (Tunisie). Comparaison avec les isotopes stables du carbone et de l'oxygène
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Morphométrie de nannofossiles calcaires au passage Crétacé-Paléocène des coupes de Bidart (France) et d'Elles (Tunisie). Comparaison avec les isotopes stables du carbone et de l'oxygène. / Thibault, Nicolas; Minoletti, Fabrice; Gardin, Silvia; Renard, Maurice.
In: Bulletin de la Societe Geologique de France, Vol. 175, No. 4, 01.12.2004, p. 399-412.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Morphométrie de nannofossiles calcaires au passage Crétacé-Paléocène des coupes de Bidart (France) et d'Elles (Tunisie). Comparaison avec les isotopes stables du carbone et de l'oxygène
AU - Thibault, Nicolas
AU - Minoletti, Fabrice
AU - Gardin, Silvia
AU - Renard, Maurice
PY - 2004/12/1
Y1 - 2004/12/1
N2 - A detailed biometric analysis of five species of calcareous nannofossils was carried out on samples from the uppermost Maastrichtian and lowermost Danian of Bidart (Basque Country, SW France) and Elles (central Tunisia). This study reveals the existence of two morphotypes of A. cymbiformis and an abrupt reduction of the five species immediately below the K-T boundary, likely in relation with a stressful environment, which would have developed just before the deposition of the iridium level, followed by a sudden size increase in the basal Danian reflecting the reworking pattern of the Cretaceous species. In addition, the comparison of biometric and isotopic data seems to indicate that the two morphotypes of A. cymbiformis have different ecologies, the large one being favoured in cool waters.
AB - A detailed biometric analysis of five species of calcareous nannofossils was carried out on samples from the uppermost Maastrichtian and lowermost Danian of Bidart (Basque Country, SW France) and Elles (central Tunisia). This study reveals the existence of two morphotypes of A. cymbiformis and an abrupt reduction of the five species immediately below the K-T boundary, likely in relation with a stressful environment, which would have developed just before the deposition of the iridium level, followed by a sudden size increase in the basal Danian reflecting the reworking pattern of the Cretaceous species. In addition, the comparison of biometric and isotopic data seems to indicate that the two morphotypes of A. cymbiformis have different ecologies, the large one being favoured in cool waters.
KW - Calcareous nannofossils
KW - K-T boundary
KW - Morphometry
KW - Morphotypes
KW - Stable isotopes
UR - http://www.scopus.com/inward/record.url?scp=12544258726&partnerID=8YFLogxK
U2 - 10.2113/175.4.399
DO - 10.2113/175.4.399
M3 - Tidsskriftartikel
AN - SCOPUS:12544258726
VL - 175
SP - 399
EP - 412
JO - Bulletin - Societie Geologique de France
JF - Bulletin - Societie Geologique de France
SN - 0037-9409
IS - 4
ER -
ID: 203865088