These features suggest generation of the lamprophyre by partial melting of a metasomatized, garnet peridotite mantle source.
The garnet neoblasts are also arranged in strings that define the foliation and lineation along with titanite.
In weakly deformed gneiss, the mafic minerals (biotite, augite and hornblende) occur as irregular clusters, locally separated from plagioclase by coronas of garnet.
Here, the igneous and corona textures are obliterated by the growth of amphibolite-facies assemblages with hornblende, plagioclase, biotite, garnet and zoisite.
A method for calculating effective bulk composition modification due to crystal fractionation in garnet-bearing schist: implications for isopleth thermobarometry.
The finegrained matrix is composed of plagioclase, quartz, garnet, biotite and hornblende and/or augite.
The lower part of the metamorphic sole is composed of kyanite and garnet-bearing mica schist, mica schist, quartzite and marble.
Melting is tentatively deduced to have commenced at + 100 km, straddling the garnet-spinel transition.
