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Pyroxenous greywackes in the Southern Uplands of Scotland and their petrotectonic implications

Published online by Cambridge University Press:  01 May 2009

M. T. Styles ,
M. Perez-Alvarez  and
J. D. Floyd
M. T. Styles
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
M. Perez-Alvarez
Affiliation:
British Geological Survey, Sir Kingsley Dunham Centre, Keyworth, Nottingham NG12 5GG, UK
J. D. Floyd
Affiliation:
British Geological Survey, Murchison House, West Mains Road, Edinburgh EH9 3LA, UK
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Abstract

Detrital clinopyroxenes occur abundantly in several greywacke formations in the Southern Uplands, both as single grains and within andesite lithoclasts. Compositionally, these pyroxenes fall into two main groups. Those from the oldest unit, the early Caradoc Galdenoch Formation, were derived from a simple tholeiitic volcanic arc. In contrast, the pyroxenes in the younger Portpatrick (late Caradoc) and Glenlee (Ashgill) Formations and the Gala Group (early Llandovery), show initial strongly calc-alkaline affinities, followed by a more complex calc-alkaline to transitional (calc-alkaline to tholeiitic) volcanic arc signature. The latter may be due to a mixture of calc-alkaline and tholeiitic components. A presently exposed source for the andesites has not yet been established, although the Ballantrae Complex is a potential candidate for a tholeiitic component.

Type
Articles
Information
Geological Magazine , Volume 132 , Issue 5 , September 1995 , pp. 539 - 547
Copyright
Copyright © Cambridge University Press 1995

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