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Miller, Kenneth G; Fairbanks, Richard G; Thomas, Ellen (1987): 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 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.788720, Supplement to: Miller, KG et al. (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, https://doi.org/10.2973/dsdp.proc.94.132.1987

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Abstract:
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 also relatively isolated prior to 24 Ma. At about 15 Ma, d13C values at Site 608 attained values similar to the western North Atlantic, indicating increased eastern basin ventilation in the middle Miocene. This increased advection into the eastern basin predated a major d18O increase which occurred at about 14.6 Ma. Subsidence estimates of the Greenland-Scotland Ridge indicate that the deepening of the Iceland-Faeroe Ridge was coincident with the marked change in eastern basin deep-water ventilation.
Project(s):
Deep Sea Drilling Project (DSDP)
Coverage:
Median Latitude: 30.101150 * Median Longitude: -62.436087 * South-bound Latitude: -0.498700 * West-bound Longitude: 158.511500 * North-bound Latitude: 45.031700 * East-bound Longitude: -7.974800
Date/Time Start: 1969-12-15T00:00:00 * Date/Time End: 1983-07-13T00:00:00
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
8 datasets

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Datasets listed in this publication series

  1. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3E) DSDP Site 9-77 age from model. https://doi.org/10.1594/PANGAEA.788716
  2. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3G) DSDP Site 12-119 age from model. https://doi.org/10.1594/PANGAEA.788719
  3. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3F) DSDP Site 30-289 age from model. https://doi.org/10.1594/PANGAEA.788718
  4. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3C) DSDP Site 82-563 age from model 1. https://doi.org/10.1594/PANGAEA.788714
  5. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3D) DSDP Site 82-563 age from model 2. https://doi.org/10.1594/PANGAEA.788715
  6. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3A) DSDP Site 94-608 age from model 1. https://doi.org/10.1594/PANGAEA.788712
  7. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 3B) DSDP Site 94-608 age from model 2. https://doi.org/10.1594/PANGAEA.788713
  8. Miller, KG; Fairbanks, RG; Thomas, E (1987): (Table 2) Oxygen and carbon isotopic values for mixed species of Cibicidoides, DSDP Hole 94-608. https://doi.org/10.1594/PANGAEA.788711