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Carboniferous and Permian magmatism in Scotland

By
B. G. J. Upton
B. G. J. Upton
School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK (e-mail: bupton@glg.ed.ac.uk)
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D. Stephenson
D. Stephenson
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA UK
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P. M. Smedley
P. M. Smedley
British Geological Survey, Maclean Building, Wallingford, Oxfordshire 0X10 8BB, UK
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S. M. Wallis
S. M. Wallis
School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK (e-mail: bupton@glg.ed.ac.uk)
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J. G. Fitton
J. G. Fitton
School of Geosciences, University of Edinburgh, West Mains Road, Edinburgh EH9 3JW, UK (e-mail: bupton@glg.ed.ac.uk)
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Published:
January 01, 2004

Abstract

Extensional tectonics to the north of the Variscan Front during the Early Carboniferous generated fault-controlled basins across the British Isles, with accompanying basaltic magmatism. In Scotland Dinantian magmatism was dominantly mildly alkaline–transitional in composition. Tournaisian activity was followed by widespread Visean eruptions largely concentrated within the Scottish Midland Valley where the lava successions, dominantly of basaltic–hawaiitic composition, attained thicknesses of up to 1000 m. Changing stress fields in the late Visean coincided with a change in the nature of the igneous activity; subsequently, wholly basic magmatism persisted into the Silesian. As sedimentary basin fills increased, sill intrusion tended to dominate over lava extrusion. In the Late Carboniferous (Stephanian) a major melting episode, producing large volumes of tholeiitic magma, gave rise to a major dyke swarm and sills across northern England and Scotland. Alkali basaltic magmatism persisted into the Permian, possibly until as late as 250 Ma in Orkney. Geochemical data suggest that the Carboniferous–Permian magmas were dominantly of asthenospheric origin, derived from variable degrees of partial melting of a heterogeneous mantle source; varying degrees of interaction with the lithosphere are indicated. Peridotite, pyroxenite and granulite-facies basic meta-igneous rocks entrained as xenoliths within the most primitive magmas provide evidence for metasomatism of the lithospheric mantle and high-pressure crystal fractionation.

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Contents

Geological Society, London, Special Publications

Permo-Carboniferous Magmatism and Rifting in Europe

M. Wilson
M. Wilson
Leeds University, UK
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E.-R. Neumann
E.-R. Neumann
University of Oslo, Norway
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G. R. Davies
G. R. Davies
Vrije University, The Netherlands
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M. J. Timmerman
M. J. Timmerman
Universität Potsdam, Germany
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M. Heeremans
M. Heeremans
University of Oslo, Norway
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B. T. Larsen
B. T. Larsen
Norsk Hydro ASA/Saga Petroleum ASA, Norway
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Geological Society of London
Volume
223
ISBN electronic:
9781862394711
Publication date:
January 01, 2004

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