Reaction textures in contact-metamorphosed xenoliths; implications for the tectonothermal evolution of the Seiland igneous province, Norwegian Caledonides

framework silicates garnet group Caledonides Cambrian orthosilicates metamorphic rocks metamorphism Paleozoic chain silicates nesosilicates ilmenite orthopyroxene Scandinavia phase equilibria Western Europe feldspar group Norway oxides Finnmark Norway Seiland Europe silica minerals silicates cordierite corundum inclusions Precambrian pyroxene group ring silicates upper Precambrian quartz spinel