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Occurrence of a sheeted dolerite dyke complex in the Ballantrae ophiolite, Scotland

Published online by Cambridge University Press:  01 July 1998

G. J. H. OLIVER  and
R. R. McALPINE
G. J. H. OLIVER
Affiliation:
Crustal Geodynamics Group, School of Geography and Geosciences, St Andrews University, St Andrews, Fife, Scotland KY16 9ST, UK
R. R. McALPINE
Affiliation:
Crustal Geodynamics Group, School of Geography and Geosciences, St Andrews University, St Andrews, Fife, Scotland KY16 9ST, UK Now at Halliburton Manufacturing and Services Ltd., Howe Moss Place, Kirkhill Industrial Estate, Dyce, Aberdeen, Scotland AB21 0GN, UK
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Abstract

A sheeted dolerite dyke swarm has been discovered at Duniewick Fort, Ballantrae. It forms part of the Early Ordovician Ballantrae Complex of Ayrshire, southwest Scotland. Asymmetric chilled margins, parallel to sub-parallel dykes and multiple dykes (dykes within dykes) are found. Although the mineralogy has been altered by metamorphism, the geochemistry is comparable with modern day back-arc marginal basin basalt. Cross-cutting sills have the chemistry of within-plate basalt. The regional geological setting suggests that an ophiolite sequence has been dismembered and incorporated into a serpentinite mélange. This is the first description of a 100% sheeted dyke complex (senso stricto) from the Ballantrae ophiolite.

Type
Research Article
Information
Geological Magazine , Volume 135 , Issue 4 , July 1998 , pp. 509 - 517
Copyright
© 1998 Cambridge University Press

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