prograde metamorphism

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• Metamorphism — For other uses, see Metamorphism (disambiguation). Schematic representation of a metamorphic reaction. Abbreviations of minerals: act = actinolite; chl = chlorite; ep = epidote; gt = garnet; hbl = hornblende; plag = plagioclase. Two minerals… …   Wikipedia

• prograde — [ prəʊgreɪd] adjective 1》 Astronomy proceeding from west to east; direct. The opposite of retrograde. 2》 Geology (of metamorphism) resulting from an increase in temperature or pressure. verb Geology (of a coastline) advance towards the sea as a… …   English new terms dictionary

• Ultra-high-temperature metamorphism — (UHT) represents extreme crustal metamorphism with metamorphic temperatures exceeding 900 °C (Harley, 1998 Geol. Soc. Lond; Brown, 2007 Int. Geol. Rev.; Kelsey, 2008 Gondwana Res.; Santosh and Omori, 2008a Gondwana Res.). Granulite facies rocks… …   Wikipedia

• metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …   Universalium

• Kambalda type komatiitic nickel ore deposits — Kambalda type nickel ore deposits are a class of magmatic nickel copper ore deposit in which the physical processes of komatiite volcanology serve to enrich, concentrate and deposit nickel bearing sulfide within the lava flow environment of an… …   Wikipedia

• Lawsonite — is a hydrous calcium aluminium sorosilicate mineral with formula CaAl2Si2O7(OH)2·H2O. Lawsonite crystallizes in the orthorhombic system in prismatic, often tabular crystals. Crystal twinning is common. It forms transparent to translucent… …   Wikipedia

• Kalahari craton — The Kalahari craton occupies a large portion of South Africa and consists of the Kaapvaal, the Zimbabwe craton, the Limpopo belt, and the Namaqua Belt. It has formed a stable unit for the past 2.3 billion years (2.3 Ga). As such, it contains some …   Wikipedia

• Emily Ann and Maggie Hays nickel mines — The Emily Ann and Maggie Hays nickel deposits are situated approximately 150km west of the town of Norseman, Western Australia, within the Lake Johnston Greenstone Belt [Hill R.E.T, Barnes S.J., Gole M.J., and Dowling S.E., 1990. Physical… …   Wikipedia

• Mount Monadnock — This article is about the mountain in New Hampshire. For other mountains with similar names, see Monadnock (disambiguation) Coordinates: 42°51′39″N 72°6′29″W / 42.86083°N …   Wikipedia

• Migmatite — Ptygmatic folding in migmatite Migmatite on the coast of Saa …   Wikipedia

• Cummingtonite — Cummingtonite …   Wikipedia