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Phase equilibrium constraints on conditions of granulite-facies metamorphism at Scourie, NW Scotland

T.E. Johnson and R.W. White
Journal of the Geological Society, 168, 147-158, 6 January 2011, https://doi.org/10.1144/0016-76492010-069
T.E. Johnson
Earth System Science Research Centre, Institute for Geosciences, University of Mainz, Becherweg 21, D-55099, Mainz, Germany
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R.W. White
Earth System Science Research Centre, Institute for Geosciences, University of Mainz, Becherweg 21, D-55099, Mainz, Germany
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Abstract:

The metamorphic evolution of a metapyroxenite and metagabbro from Scourie, NW Scotland, is investigated using phase equilibria modelled in the NCFMASHTO (Na2O–CaO–FeO–MgO–Al2O3–SiO2–H2O–TiO2–O) system. The calculated stability fields for the observed assemblages in each rock overlap and imply conditions of 8.5–11.5 kbar and 875–975 °C for the peak of granulite-facies (Badcallian) metamorphism. The lack of any evidence for the former presence of garnet in the metapyroxenite suggests that the rocks cannot have reached pressures much in excess of those recorded at the metamorphic peak. The growth of coronas of plagioclase, orthopyroxene and magnetite replacing garnet in the metagabbro is consistent with near-isothermal retrograde decompression from the metamorphic peak to pressures of 7–9 kbar. The constraints on the pressure–temperature evolution imposed by the modelled phase equilibria are more consistent with a process of crustal growth dominated by magmatic accretion rather than by significant tectonic thickening during the early Scourian.

Supplementary material: Mineral chemical data are available at http://www.geolsoc.org.uk/SUP18436.

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Journal of the Geological Society: 168 (1)
Journal of the Geological Society
Volume 168, Issue 1
January 2011
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Phase equilibrium constraints on conditions of granulite-facies metamorphism at Scourie, NW Scotland

T.E. Johnson and R.W. White
Journal of the Geological Society, 168, 147-158, 6 January 2011, https://doi.org/10.1144/0016-76492010-069
T.E. Johnson
Earth System Science Research Centre, Institute for Geosciences, University of Mainz, Becherweg 21, D-55099, Mainz, Germany
  • Find this author on Google Scholar
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  • For correspondence: tjohnson@uni-mainz.de
R.W. White
Earth System Science Research Centre, Institute for Geosciences, University of Mainz, Becherweg 21, D-55099, Mainz, Germany
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  • Find this author on PubMed
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Phase equilibrium constraints on conditions of granulite-facies metamorphism at Scourie, NW Scotland

T.E. Johnson and R.W. White
Journal of the Geological Society, 168, 147-158, 6 January 2011, https://doi.org/10.1144/0016-76492010-069
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