Using calculated chemical potential relationships to account for replacement of kyanite by symplectite in high pressure granulites

J. A. Baldwin*, R. Powell, R. W. White, P. Stipska

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

Calculated mineral equilibria are used to account for the formation of sapphirine-plagioclase, spinel-plagioclase and corundum-plagioclase symplectites replacing kyanite in quartz-plagioclase-garnet-kyanite granulite facies gneisses from the Southern Domain of the Athabasca granulite terrane, a segment of the Snowbird tectonic zone in northern Saskatchewan, Canada. Metamorphic conditions of >14kbar and 800 degrees C are established for the high pressure, garnet-kyanite assemblage using constraints from P-T pseudosections and Zr-in-rutile thermometry. Replacement of kyanite by symplectites reflects the reaction of kyanite with the matrix following near-isothermal decompression to

Original languageEnglish
Pages (from-to)311-330
Number of pages20
JournalJournal of Metamorphic Geology
Volume33
Issue number3
DOIs
Publication statusPublished - Apr 2015

Keywords

  • Athabasca granulite terrane
  • chemical potential
  • garnet-kyanite granulite
  • sapphirine-spinel-corundum-plagioclase symplectite
  • Snowbird tectonic zone
  • WESTERN CANADIAN SHIELD
  • SNOWBIRD TECTONIC ZONE
  • ATHABASCA MYLONITE ZONE
  • HIGH-TEMPERATURE METAMORPHISM
  • HIGH-P GRANULITES
  • GEOCHRONOLOGICAL CONSTRAINTS
  • NORTHERN SASKATCHEWAN
  • HETEROGENEOUS STRAIN
  • PHASE-EQUILIBRIA
  • BOHEMIAN MASSIF

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