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Geological Society, London, Special Publications; 1987; v. 27; p. 93-107;
DOI: 10.1144/GSL.SP.1987.027.01.09
© 1987 Geological Society of London

Petrology of Scourian supracrustal rocks and orthogneisses from Stoer, NW Scotland: implications for the geological evolution of the Lewisian complex

I. Cartwright & A. C. Barnicoat

Department of Geology, University College of Wales, Aberystwyth, Dyfed SY23 3DB, UK
Department of Geology, University College of Wales, Aberystwyth, Dyfed SY23 3DB, UK

The Lewisian complex at Stoer comprises a diverse assemblage of paragneisses together with several generations of acid to basic orthogneiss. All lithologies are early-Scourian in age and underwent granulite-facies metamorphism in the Badcallian (c. 2.7 Ga) event. Petrogenetic modelling coupled with geothermometry yields a P-T estimate for the peak of metamorphism of 920–990°C and >11 kb, as well as estimates of conditions encountered during Inverian (c. 2.6–2.3 Ga) and Laxfordian (<1.7 Ga) retrogression. Certain lithologies, especially those of supracrustal origin, show evidence of partial melting. It is suggested that anatexis, controlled by the internal buffering of metamorphic fluids, may have been an important process in the evolution of the complex.





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T. J. Wynn
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Geological Society, London, Special Publications, 1995; 95: 225 - 241.
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