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

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 segm...

Full description

Saved in:
Bibliographic Details
Published in:Journal of metamorphic geology 2015-04, Vol.33 (3), p.311-330
Main Authors: Baldwin, J. A., Powell, R., White, R. W., Štípská, P.
Format: Article
Language:English
Subjects:
Athabasca granulite terrane
chemical potential
Earth Sciences
garnet-kyanite granulite
Geochemistry
Metamorphic rocks
Metamorphism
Mineralogy
Petrography
sapphirine-spinel-corundum-plagioclase symplectite
Sciences of the Universe
Snowbird tectonic zone
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 >14 kbar and 800 °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
ISSN:0263-4929
1525-1314
DOI:10.1111/jmg.12122