Images on this page were acquired using the UMass Dept. of Geosciences'
Cameca SX-50 electron microprobe.
A sapphirine-bearing granulite from the Snowbird tectonic zone, northern Saskatchewan,
Canada. A peak metamorphic assemblage of garnet, quartz, kyanite and clinopyroxene
has been extensively modified and replaced by sillimanite (masses at top of view)
, plagioclase (strongly zoned, forming much of new matrix), sapphirine-plagioclase
symplectites (fringing most phases) , corundum-plagioclase symplectites (among
sapph-plag) and orthopyroxene-plagioclase symplectites (isolated, dark in the
above view. Remnant garnet (bottom) shows profound zonation in Ca.
A map of Al covering the same area provides additional
distinction between phases. Note particularly that the scale of the equilibrium
domains may be less than 50 micrometers in this specimen.
For more information about this image contact:
Michael L. Williams