Paleoenvironmental Study of Barremian-Albian Sediments at Deep Sea Drilling Project Site 549 in the Eastern North Atlantic

Rat, P.; Gillot, E.; Magniez, F.; Pascal, A.

doi:10.2973/dsdp.proc.80.140.1985

Cited by 1 publication

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“…The authors infer from seismic profiles (Figs 3 and 4) that no sediment much older than Barremian was deposited in the deepest parts of the adjacent grabens. The sequence drilled at Site 549 reflects a progressive deepening from hyposaline to open-marine, outer sublittoral palaeoenvironments (Snyder et al 1985;Rat et al 1985;Fig. 5).…”

Section: Initiation Of a Pelagic Regime During The Barremianmentioning

confidence: 99%

Evidence for changes in Mesozoic and Cenozoic oceanic circulation on the south-western continental margin of Ireland: DSDP/IPOD Leg 80

Graciansky

Poag

Hailwood

et al. 1986

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Summary A transect of four coreholes, drilled by the Glomar Challenger across the Irish continental margin at the Goban Spur, evidences a dynamic palaeoceanographic regime during the late Mesozoic and Cenozoic. Shallow marine waters invaded the rift-stage grabens of the Goban Spur in the early Barremian. Thereafter, the margin subsided rapidly, producing a pelagic depositional regime by late Barremian time. Deep marine conditions were maintained as sea-floor spreading began in the early Albian, and chiefly pelagic deposition continued to the present. Among a series of significant post-rift oceanographic changes, one of the most notable is the familiar fluctuation of oxic and anoxic sea-floor environments during the Cenomanian and Turonian. Another marked change took place during the late Palaeocene, when cooler, oxygen-rich, northern bottom waters reached the Goban Spur as a consequence of rifting and sea-floor spreading between Greenland, Rockall Plateau, and Norway. Later during the Cenozoic, the initial production of Antarctic bottom water, several accelerations of polar icecap growth, and fluctuating eustatic sea-level produced a variety of circulatory shifts on the Goban Spur. A particularly significant sedimentological consequence of these interacting processes was the widespread creation of numerous erosional and non-depositional unconformities.

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Section: Initiation Of a Pelagic Regime During The Barremianmentioning

confidence: 99%