A strange phenomenon first described from south India and Sri Lanka, where in acid to intermediate rocks granulite-facies assemblages (charnockite) are found in vein-like arrays superimposed over amphibolite-facies gneisses. These features are now known, on a less conspicuous scale, from a number of other terrains.
Also asked, what type of rock is Granulite?
Also, is Granulite foliated or Nonfoliated?
Amphibolite: Med-high grade metamorphosed mafics, made up largely of plagioclase and amphibole. Granulite: lack foliation, have large granular equant crystals.
What is the parent rock of Granulite?
Granulite Facies - high grade regional metamorphism. Characterized by pyroxene rich rocks if a mafic parent, quartz and feldspar rich gneisses if a complex siliciclastic sedimentary parent, plus other rocks from other parents.
How is Granulite formed?
Formation. Granulites form at crustal depths, typically during regional metamorphism at high thermal gradients of greater than 30 °C/km. In continental crustal rocks, biotite may break down at high temperatures to form orthopyroxene + potassium feldspar + water, producing a granulite.