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Migmatitic granulites from the Indian Head Range (IHR) are dominated by granoblastic, Opx-bearing (quartz) dioritic gneiss with subordinate garnet+orthopyroxene+biotite+albite (+/-quartz+/-microcline+/-cordierite+/-sillimanite) gneiss and comparatively biotite-rich, sapphirine+cordierite+orthopyroxene+albite (+/-microcline+/-sillimanite+/-corundum) gneiss. The latter contains at least two generations...
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...
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