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Publication details for Prof Richard DaviesDavies, R.J., Cartwright, J.A., Pike, J. & Line, C. (2001). Early Oligocene initiation of North Atlantic Deep Water formation. Nature 410(6831): 917-920.
- Publication type: Journal papers: academic
- ISSN/ISBN: 0028-0836, 1476-4687
- DOI: 10.1038/35073551
- View online: Online version
- Durham research online: DRO record
Author(s) from Durham
Dating the onset of deep-water flow between the Arctic and North Atlantic oceans is critical for modelling climate change in the Northern Hemisphere1, 2 and for explaining changes in global ocean circulation throughout the Cenozoic era3 (from about 65 million years ago to the present). In the early Cenozoic era, exchange between these two ocean basins was inhibited by the Greenland–Scotland ridge3, 4, but a gateway through the Faeroe–Shetland basin has been hypothesized3, 5. Previous estimates of the date marking the onset of deep-water circulation through this basin—on the basis of circumstantial evidence from neighbouring basins—have been contradictory5, 6, 7, 8, 9, ranging from about 35 to 15 million years ago. Here we describe the newly discovered Southeast Faeroes drift, which extends for 120 km parallel to the basin axis. The onset of deposition in this drift has been dated to the early Oligocene epoch (35 million years ago) from a petroleum exploration borehole. We show that the drift was deposited under a southerly flow regime, and conclude that the initiation of deep-water circulation from the Norwegian Sea into the North Atlantic Ocean took place much earlier than is currently assumed in most numerical models of ancient ocean circulation.
1. Broeker, W. S. The great ocean conveyor. Oceanography 4, 79±89 (1991).
2. Schnitker, D. North Atlantic oceanography as possible cause of Antarctic glaciation and eutrophication.
Nature 284, 615±616 (1980).
3. Vogt, P. R. The Faeroe±Iceland±Greenland aseismic ridge and the western boundary undercurrent.
Nature 239, 79±81 (1972).
4. Eldholm, O. Paleogene North Atlantic magmatic-tectonic events: environmental implications. Mem.
Soc. Geol. Ital. 44, 13±28 (1990).
5. Miller, K. G. & Tucholke, B. E. in Structure and Development of the Greenland-Scotland Ridge (eds Bott,
M. H. P., Saxov, S., Talwani, M. & Thiede, J.) 549±589 (Plenum, New York, 1983).
6. Thiede, J. & Eldholm, O. in Structure and Development of the Greenland-Scotland Ridge (eds Bott, M.
H. P., Saxov, S., Talwani, M. & Thiede, J.) 445±455 (Plenum, New York, 1983).
7. Wold, C. N. Cenozoic sediment accumulation on drifts in the northern North Atlantic. Paleoceanography
9, 917±941 (1994).
8. Wright, J. D. & Miller, K. G. Control of North Atlantic Deep Water circulation by the Greenland±
Scotland Ridge. Paleoceanography 11, 157±170 (1996).
9. Bergrren, W. A. & Schnitker, D. in Structure and Development of the Greenland-Scotland Ridge (eds
Bott, M. H. P., Saxov, S., Talwani, M. & Thiede, J.) 495±545 (Plenum, New York, 1983).
10. Bergrren,W. A. & Hollister, C. D. in Studies in Paleo-oceanography (ed. Hay,W.W.) 126±186 (Society
for Economic, Paleontology and Mineralogy, Tulsa, Oklahoma, 1974).
11. Schnitker, D. Global Paleoceanography and its deep water linkage to the Antarctic glaciation. Earth
Sci. Rev. 16, 1±20 (1980).
12. Stoker,M. S. in Geological Processes on Continental Margins (eds Stoker,M. S., Evans, D. & Cramp, A.)
229±254 (Geological Society, London, 1998).
13. Stow,D. A. V. & Holbrook, J. A. Hatton Drift contourites, northeast Atlantic. Init. Rep. DSDP 81, 695±
14. Kidd, R. B. & Hill, P. R. Sedimentation on Feni and Gardar sediment drifts. Init. Rep. ODP 94, 1217±
15. Wold, C. N. in The Tectonics, Sedimentation and Palaeoceanography of the North Atlantic Region (eds
Scrutton, R. A., Stoker, M. S., Shimmield, G. B. & Tudhope, A. W.) 271±302 (Geological Society,
16. Shor, A. N. & Poore, R. Z. Bottom currents and ice rafting in the North Atlantic. Init. Rep. DSDP 49,
17. Nilsen, T. H. in Structure and Development of the Greenland-Scotland Ridge (eds Bott, M. H. P., Saxov,
S., Talwani, M. & Thiede, J.) 457±477 (Plenum, New York, 1983).
18. Heinrich, R., Wolf, T. C., Bohrmann, G. & Thiede, J. Cenozoic paleoclimatic and paleoceanographic
changes in the northern hemisphere revealed by variability of coarse fraction composition in
sediments from the Voring Plateau. Proc. ODP Sci. Res 104, 75±188 (1989).
19. Mitchell, S. M. et al. in Petroleum Geology of Northwest Europe: Proc. 4th Conf. (ed. Parker, J. R.) 1011±
1023 (Geological Society, London, 1993).
20. Davies, R., Cartwright, J. & Rana, J. Giant hummocks in deep-water marine sediments: Evidence for
differential compaction and large-scale density inversion during early burial. Geology 27, 907±910
21. Boldreel, L. O. & Andersen, M. S. in The Tectonics, Sedimentation and Palaeoceanography of the North
Atlantic Region (eds Scrutton, R. A., Stoker, M. S., Shimmield, G. B. & Tudhope, A. W.) 145±158
(Geological Society, London, 1995).
22. Hollister, C. D. & Heezen, B. C. in Studies in Physical Oceanography (ed. Gordon, A. L.) 37±66
(Gordon and Breach, New York, 1972).
23. FaugeÁres, J.-C., Stow, D. A. V., Imbert, P. & Viana, A. Seismic features diagnostic of contourite drifts.
Mar. Geol. 162, 1±38 (1999).
24. Martini, E. Standard Tertiary and Quarternary calcareous nannoplankton zonation. Proc. 2nd
Plankton. Conf. Roma 2, 739±785 (1971).
25. Blow, W. H. The Cainozoic Globigerinida 1±1413 (Brill, Leiden, 1979).
26. Hein, J. R., Scholl, D. W., Barron, J. A., Jones, M. G. & Miller, J. Diagenesis of late Cenozoic
diatomaceous deposits and formation of the bottom-simulating re¯ector in the southern Bering Sea.
Sedimentology 25, 144±181 (1978).
27. Dean, K., McLachlan, K. & Chambers, A. in Petroleum Geology of Northwest Europe: Proc. 5th Conf.
(eds Fleet, A. J. & Boldy, S. A. R.) 533±544 (Geological Society, London, 1999).
28. Crowley, T. J.North Atlantic DeepWater cools the southern hemisphere. Paleoceanography 7, 489±497
29. Harland, W. B. et al. A Geologic Time Scale 1989. (Cambridge Univ. Press, Cambridge, 1990).