gneiss metamorphosis

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• Oldest rock — The oldest rock or rocks on Earth, as an aggregate of minerals that have not undergone subsequent metamorphosis, are from the Archean Eon. Such rocks are only exposed on the surface in very few places. [Some meteorites, such as the ALH84001 Mars… …   Wikipedia

• Musgrave Block — The Musgrave Block is an east west trending belt of Proterozoic granulite gneiss basement rocks approximately 500km long. The Musgrave Block extends from western South Australia into Western Australia. The Musgrave Block is primarily exposed… …   Wikipedia

• Penninic nappes — The Penninic nappes or the Penninicum are one of three nappe stacks and geological zones in which the Alps can be divided. In the western Alps the Penninic nappes are more obviously present than in the eastern Alps (in Austria), where they crop… …   Wikipedia

• Magicians of Xanth — For more characters of the Xanth series by Piers Anthony, see List of Xanth characters. The Magicians of Xanth are mostly humans with the most powerful magical talents. With such powerful talents, they are the only people who qualify to be the… …   Wikipedia

• Mudrock — Glacial Lake Missoula claystone Red mudrock in the Ragged Reef Formation ( …   Wikipedia

• Chamoli district — Chamoli चमोली ज़िला   district   …   Wikipedia

• graphite — graphitic /greuh fit ik/, adj. /graf uyt/, n. a very common mineral, soft native carbon, occurring in black to dark gray foliated masses, with metallic luster and greasy feel: used for pencil leads, as a lubricant, and for making crucibles and… …   Universalium

• metamorphism — [met΄əmôr′fiz΄əm] n. 1. METAMORPHOSIS 2. change in the mineralogical, structural, or textural composition of rocks under pressure, heat, chemical action, etc., which turns limestone into marble, granite into gneiss, etc …   English World dictionary