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Learning more about the history of oceanic sedimentation and its relationship to the development of abyssal circulation in the northeastern Atlantic was a major objective of Leg 81 drilling. Accordingly, sites were situated on an EastWest traverse across the southwestern margin of Rockall Plateau and the Hatton Drift. All sites had a similar stratigraphic sequence of late Paleocene-early Eocene volcanogenic/shallow-water sediments lying below a major late Eocene-Miocene unconformity. Overlying this hiatus was a sediment-drift sequence of Mio-Pliocene pelagic ooze capped by a Plio-Pleistocene rhythmic sequence of ooze and marl deposited during glacial conditions. The clay-mineral components of these sediments reflect the developing exchange of water between the northeastern Atlantic and the Norwegian Sea as the Greenland-Scotland Ridge subsided during the Cenozoic. Evidence presented here suggests an early Eocene initiation of the Northeast Atlantic Passage. Major flow through this passage in the late Eocene/Oligocene stimulated changes in abyssal circulation throughout the North Atlantic, the regional mid-Tertiary unconformity being the most dramatic result.

Lithostratigraphy and Clay Mineralogy of the Western Margin of the Rockall Plateau and the Hatton Sediment Drift