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Migmatitic rocks near Grenville, Quebec, preserve features indicative of reactions at the onset of granulite facies metamorphism. In this area, metapelites and metacarbonates of the classic Grenville Series are spatially associated with granitic gneiss and metabasite, and flank a Paleozoic, Fe-rich syenite stock. Near this intrusion, the metapelite is diatexitic and nearly devoid of biotite, indicating...
The Pe˜na Negra anatectic complex (central Spain) was formed from a pelitic protolith low in boron (3–80 ppm), by dehydration reactions, melting and fluid loss, which expelled much of the boron; residual B is present in sillimanite and muscovite. Migmatite melanosomes and restites (sillimanite + biotite + ilmenite) are relatively richer in B (mean 29 ppm), while the leucosomes are poorer (13 ppm)...
Migmatites exposed in the Deep Freeze Range, northern Victoria Land, Antarctica contain the mineral assemblage biotite + quartz + plagioclase + K-feldspar ± garnet ± cordierite ± sillimanite in mesosomes, with concordant and discordant leucosomes. Partial melting is considered the main migmatite-forming process at approximately 700–750 °C and 4–5 kbar. In mesosomes, garnet displays contrasting microstructural...
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