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The Role of Tholeiitic Magmatism in the English Lake District: Evidence from Dykes in Eskdale

Published online by Cambridge University Press:  05 July 2018

R. Macdonald ,
D. Millward ,
B. Beddoe-Stephens  and
J. Laybourn-Parry
R. Macdonald
Affiliation:
Department of Environmental Science, University of Lancaster, Lancaster LA1 4YQ
D. Millward
Affiliation:
British Geological Survey, Windsor Court, Windsor Terrace, Newcastle upon Tyne NE2 4HB
B. Beddoe-Stephens
Affiliation:
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA
J. Laybourn-Parry
Affiliation:
Department of Biological Sciences, University of Lancaster, Lancaster LA1 4YQ
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Abstract

Mafic dykes occur in close association with, and both cut and are cut by, the Eskdale granite in the south-western Lake District. The dykes range compositionally from magnesian basalt to andesite and are divided into two groups: (1) high-Fe-Ti rocks of tholeiitic affinity forming most of the dykes and (2) a lower-Fe-Ti group, comparable in composition to the lavas of the Borrowdale Volcanic Group. The dykes extend the range of tholeiitic magmatism in the Lakes into late Ordovician, and possibly Silurian times, and indicate that published plate tectonic models partly based on the distribution of magma types are perhaps over-simplified. The Eskdale dykes form one end of a spectrum of Lake District compositions from tholeiitic to calc-alkaline. All the magma types may have shared a common mantle source, their final composition reflecting residence times in the crust or LIL-enriched mantle.

Keywords

Tholeiitic magmatismEnglish Lake DistrictEskdale
Type
Petrology and Geochemistry
Information
Mineralogical Magazine , Volume 52 , Issue 367 , September 1988 , pp. 459 - 472
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1988

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