Benthic foraminiferal carbon isotopic records and the development of abyssal circulation at DSDP Sites 9-77, 12-119, 30-289, 82-563 and 94-608 ...

• Main Authors: Miller, Kenneth G, Fairbanks, Richard G, Thomas, Ellen
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 1987
• Subjects: Deep Sea Drilling Project DSDP; Denmark Strait; Iceland; North Atlantic
• Online Access: https://dx.doi.org/10.1594/pangaea.788720; https://doi.pangaea.de/10.1594/PANGAEA.788720

The North Atlantic at present is ventilated by overflow of the Denmark Strait, Iceland-Faeroe Ridge, Faeroe Bank Channel, and Wyville-Thompson Ridge. The evolution of Cenozoic abyssal circulation of this region was related to tectonic opening and subsidence of these sills. We used d13C records of the benthic foraminifer Cibicidoides to decipher the timing of tectonically controlled changes in bottom-water circulation in the eastern basins (Biscay and Iberian) of the northern North Atlantic. Records from Site 608 (Kings Trough, northeastern North Atlantic) show that from about 24 to 15 Ma (early to early middle Miocene), d13C values in the Kings Trough area were depleted relative to western North Atlantic values and were more similar to Pacific d13C values. This reflects less ventilation of the Kings Trough region as compared to the well-oxygenated western North Atlantic. Comparison of Oligocene d13C records from Site 119 (Bay of Biscay) with western North Atlantic records suggests that the eastern basin was ... : Supplement to: Miller, Kenneth G; Fairbanks, Richard G; Thomas, Ellen (1987): Benthic foraminiferal carbon isotopic records and the development of abyssal circulation in the Eastern North Atlantic. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 981-996 ...