Mid Cretaceous (Cenomanian - Turonian) black shales from ODP Leg 207 (western Central Atlantic) : Palaeoceangraphy deciphered by calcareous nannofossils
Zusammenfassung der Projektergebnisse
A high-resolution study of stable carbon isotopes and calcareous nannofossils has been made for the Cenomanian-Turonian boundary interval of Sites 1258, 1259, 1260, and 1261. Seven nannofossil-bioevents have been identified and correlated with the carbon isotope curves. The significant decrease in relative abundance of the oligotrophic species Watznaueria barnesiae going along with an increase in the eutrophic species Zeugrhabdothus erectus during the δ13Corg excursion, show that the OAE 2 was a period of enhanced productivity. Nannofossil findings throughout the Cenomanian and Turonian at Site 1260, show high fertility surface-water conditions in the lower Cenomanian, as indicated by high relative abundances of Biscutum constans. A major turnover of the nannoflora took place in the mid-Cenomanian event, evoked by the implementation of saline deep-waters and thus increased stratification of the watercolumn, culminating during OAE2.
Projektbezogene Publikationen (Auswahl)
- (2005). Biostratigraphy and palaeoecology of the Cenomanian and Turanian of Site 1260 (Leg 207, Demerara Rise) based on calcareous nannofossils. Joint Colloquium IODP/ICDP 14-16 March 2005, Potsdam, Germany
Hardas, P., Mutterlose, J.
- (2005). High-resolution image analysis of laminae in a black shale sequence from ODP Site 1260 in the Demerara Rise: Evidence for orbital and suborbital climate cycles in the latest Cenomanian. Salt Lake City Annual Meeting (16-19 October 2005)
Yum, J-G., Meyers, P. A., Moore, T. C., Hardas, P., Mutterlose, J.
- (2005). The Cenomanian - Turonian succession of Leg 207: biostratigraphy and palaeoecology. 7th International Symposium on the Cretaceous 5-9 September 2005, Neuchatel, Switzerland
Hardas, P., Mutterlose, J.
- 2005. Stable organic carbon isotope stratigraphy across Oceanic Anoxic Events 2 of Demerara Rise, western tropical Atlantic. Geochemistry, Geophysics, Geosystems 6, Q06010
Erbacher, J., Friedrich, O., Wilson, P.A., Birch, H., Mutterlose, J.
(Siehe online unter https://doi.org/10.1029/2004GC000850) - (2006). Calcareous nannofossil biostratigraphy and palaeoecology of the Cenomanian - Turonian Boundary Interval of ODP Leg 207 at the Demerara Rise (Equatorial Atlantic). INA 11 Lincoln 24-30 September 2006, Lincoln (Nebraska)
Hardas, P., Mutterlose, J.
- (2006).The Cenomanian-Turonian succession of OOP Leg 207: biostratigraphy and palaeoecology. Joint Colloquium IODP/ICDP 27. - 29 March 2006, Greifswald, Germany
Hardas, P., Mutterlose, J.
- 2006. Calcareous nannofossil biostratigraphy of the Cenomanian/Turonian boundary interval of ODP Leg 207 at the Demerara Rise. Revue de Micropaleontologie49, 165-179
Hardas, P., Mutterlose, J.
- (2007). Calcareous nannofossil biostratigraphy and palaeoecology of the Cenomanian-Turonian succession of ODP Leg 207 (Demerara Rise). The Micropalaeontological Society's Foraminifera and Nannofossil Groups Joint Spring Meeting Thursday 7th - Friday 8th June, 2007. Angers, France
Hardas, P., Mutterlose, J.
- (2007). The Cenomanian-Turonian succession of ODP Leg 207: biostratigraphy and palaeoecology. Joint Colloquium IODP/ICDP 19-21 March 2007, Potsdam, Germany
Hardas, P., Mutterlose, J.
