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The stratigraphy, environment of eruption and age of the Faroes Lava Group, NE Atlantic Ocean

By
David Ellis
David Ellis
StatoilFoeroyene a.s, Statoil House, 11a Regent Street, London SW1Y 4ST, UK
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Brian R. Bell
Brian R. Bell
Division of Earth Sciences, University of Glasgow, Gregory Building, Lilybank Gardens, Glasgow G12 8QQ, UK
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David W. Jolley
David W. Jolley
Centre for Palynology, Department of Animal & Plant Sciences, University of Sheffield, Sheffield S1 3JD, UK
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Michelle O’Callaghan
Michelle O’Callaghan
StatoilFoeroyene a.s, Statoil House, 11a Regent Street, London SW1Y 4ST, UK
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Published:
January 01, 2002

Abstract

Palaeogene volcanism on the NW margin of the Faroe-Shetland Basin is represented by the Faroes Lava Group, within an age range of 57.5–60.56 Ma. The volcanic sequence comprises >1000 m of basaltic volcaniclastic rocks deposited in estuarine or marginal lagoons, overlain by three laterally-extensive formations of subaerial facies basaltic lavas: Lower, c. 3250 m; Middle, c. 1400 m; Upper, at least 900 m (top not preserved). The Lower and Upper formations comprise high-volume sheet flows, commonly with ferrallitized tops, interbedded with reddened, thin, fluvial claystone and basaltic siltstone deposits. Laterally-impersistent coals occur within the Lower Lava Formation. The Coal-bearing Formation (c. 20 m) was deposited in an overbank floodplain environment during an hiatus in the volcanism between the Lower and Middle formations. The Volcaniclastic Sandstone Sequence comprises hydroclastic and pyroclastic deposits which post-date the Coal-bearing Formation and represent a return to volcanism, prior to the eruption of the Middle Lava Formation which is mainly characterized by inflated pahoehoe flows. The onshore sequence of the Faroes Lava Group can be correlated with basaltic flows within the Faroe-Shetland Basin, where lavas in Well 205/9-1 are interpreted to be of Lower Lava Formation affinity, possibly erupted from a local vent system. Seismic and gravity mapping and modelling suggest that the offshore extension of the Lower Lava Formation, together with the oldest part of the Middle Lava Formation, comprise subaqueous hyaloclastites deposited in a prograding Gilbert-type lava delta system. The youngest part of the Middle Lava Formation and all of the Upper Lava Formation occur as subaerial facies lavas within the basin.

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Geological Society, London, Special Publications

The North Atlantic Igneous Province: Stratigraphy, Tectonic, Volcanic and Magmatic Processes

D. W. Jolley
D. W. Jolley
University of Sheffield, UK
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B. R. Bell
B. R. Bell
University of Glasgow, UK
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Geological Society of London
Volume
197
ISBN electronic:
9781862394452
Publication date:
January 01, 2002

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