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Geological Society, London, Special Publications; 1988; v. 39; p. 69-83;
DOI: 10.1144/GSL.SP.1988.039.01.08
© 1988 Geological Society of London

Dipping Reflectors and NE Atlantic Evolution

Origin of the Palaeogene Vøring Plateau volcanic sequence

L. G. Viereck1, P. N. Taylor2, L. M. Parson3, A. C. Morton4, J. Hertogen5, I. L. Gibson6 & the ODP Leg 104 Scientific Party

1 Institut für Mineralogie, Ruhr-Universität Bochum, Postfach 102148, 4630 Bochum, Federal Republic of Germany
2 Department of Earth Sciences, University of Oxford, Parks Road, Oxford OX1 3PR, UK
3 Institute of Oceanographic Sciences, Brook Road, Wormley, Godalming, Surrey GU8 5UB, UK
4 British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
5 Department of Geology, Katholieke Universiteit Leuven, Leuven, Belgium
6 Department of Earth Sciences, University of Waterloo, Kitchener, Ontario N2L 3G1, Canada

During ODP Leg 104 a 900 m thick sequence of volcanic rocks was drilled at Site 642E on the Vøring Plateau. It was subdivided into an Upper and a Lower Series separated by 7 m of estuarine volcaniclastic and epiclastic rocks. The Upper Series comprises transitional-type mid-oceanic ridge tholeiites with chemical affinities to the Faeroes and E Greenland plateau basalts and to Recent basalts from transitional segments of the mid-Atlantic ridge such as Reykjanes Ridge. The magmas are interpreted as having been derived from a secondarily LIL-element enriched, primarily strongly depleted mantle source. Some flows and dykes show evidence of minor contamination by upper continental crustal rocks. Interlayered tuffs are more differentiated and ferrobasaltic, and are interpreted to have been derived from a LIL-element enriched plume-type mantle source. The Lower Series contains 13 peraluminous dacite flows representing melts of upper crustal metasedimentary rocks such as shales and greywackes. The dacites overlie five basaltic andesite flows formed by mixing of LIL-element depleted tholeiitic magma with upper crustal melts.





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