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A comment on ultrahigh-temperature metamorphism from an unusual corundum + orthopyroxene intergrowth bearing Al–Mg granulite from the Southern Marginal Zone, Limpopo Complex, South Africa, by Belyanin et al.

  • Gautier NicoliEmail author
  • Gary Stevens
  • Ian Buick
  • J.-F. Moyen
Comment

Studies on the Southern Marginal Zone (SMZ) of the Limpopo Belt have generally concluded that this terrain was affected by a single granulite-facies metamorphic event at 2.67–2.66 Ga (Kröner et al. 2000; Kreissig et al. 2000; Zeh et al. 2005; Elington and Armstrong 2004; Stevens and Van Reenen 1992a, b; Barton and van Reenen 1992; Barton et al. 1992; Van den Berg and Huizenga 2001; Rigby et al. 2008), with peak metamorphic conditions of 7.5–9.5 kbar and 800–850 °C. In their recent paper, Belyanin et al. (2012) propose an ultrahigh-temperature (UHT) metamorphic event in the SMZ, with peak metamorphic conditions in excess of 1,000 °C at approximately 12 kbar. Similar conclusions were proposed by earlier work on the same rock (Belyanin et al. 2010). The proposed UHT conditions are based on Al-rich orthopyroxene and ternary feldspar thermometry using reintegrated feldspar compositions. This evidence is derived from a single outcrop containing unusual aluminous layers within...

Keywords

Metamorphic Event Gray Gneiss Peak Metamorphic Temperature Feldspar Composition Southern Marginal Zone 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Gautier Nicoli
    • 1
    Email author
  • Gary Stevens
    • 1
  • Ian Buick
    • 1
  • J.-F. Moyen
    • 2
  1. 1.Department of Earth Sciences, Centre for Crustal PetrologyStellenbosch UniversityMatielandSouth Africa
  2. 2.UMR 6524 CNRSUniversité Jean-MonnetSaint-ÉtienneFrance

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