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Geological Society, London, Special Publications; 1987; v. 27; p. 81-92;
DOI: 10.1144/GSL.SP.1987.027.01.08
© 1987 Geological Society of London

Metamorphic evolution of the mainland Lewisian complex

J. D. Sills & H. R. Rollinson

Department of Geology, Leicester University, Leicester LE1 7RH, UK
Department of Geography and Geology, College of St. Paul and St. Mary, The Park, Cheltenham, Gloucestershire, UK

The equilibration conditions of early Scourian (Badcallian) granulite-facies metamorphism appear to be similar for the whole mainland Lewisian outcrop. Pyroxene and garnet assemblages equilibrated at about 7–8 kb and 750–800°C. Peak granulite facies conditions may have been slightly higher. An early high-pressure gt-cpx assemblage partially broke down to lower pressure opx + plag ± magt ± sp ± hb symplectites, indicating decompression after the peak of metamorphism. At a later stage, there was growth of a more Fe-rich garnet. Discordant trondhjemite and granite sheets, which were also metamorphosed to granulite facies, indicate very high magmatic temperatures of 890–1030°C from Fe-Ti oxides and 1000°C from hypersolvus feldspars.

The Scourian complex was extensively retrogressed during the Inverian as a result of the influx of hydrous fluids at about 600°C.





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Geological Society, London, Memoirs, 2002; 26: 73 - 76.
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T. J. Wynn
Deformation in the mid to lower continental crust: analogues from Proterozoic shear zones in NW Scotland
Geological Society, London, Special Publications, 1995; 95: 225 - 241.
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