cumulate rocks

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• Cumulate rock — Cumulate rocks are igneous rocks formed by the accumulation of crystals from a magma either by settling or floating. Cumulate rocks are named according to their texture; cumulate texture is diagnostic of the conditions of formation of this group… …   Wikipedia

• Igneous differentiation — In geology, igneous differentiation is an umbrella term for the various processes by which magmas undergo bulk chemical change during the partial melting process, cooling, emplacement or eruption. Contents 1 Definitions 1.1 Primary melts 1.2… …   Wikipedia

• Komatiite — Komatiites are ultramafic mantle derived volcanic rocks. They have low SiO2, low K2O, low Al2O3, and high to extremely high MgO. They were named for their type locality along the Komati River in South Africa. True komatiites are very rare and… …   Wikipedia

• Normative mineralogy — is a geochemical calculation of the whole rock geochemistry of a rock sample that estimates the idealised mineralogy of a rock according to the principles of geochemistry. Normative mineral calculations can be achieved via either the CIPW Norm or …   Wikipedia

• Ultramafic to mafic layered intrusions — are found in typically ancient cratons and are rare but worldwide in distribution. The intrusive complexes exhibit evidence of fractional crystallization and crystal segregation by settling or floating of minerals from a melt. Ideally the… …   Wikipedia

• 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

• Peridotite — A peridotite is a dense, coarse grained igneous rock, consisting mostly of the minerals olivine and pyroxene. Peridotite is ultramafic and ultrabasic, as the rock contains less than 45% silica. It is high in magnesium, reflecting the high… …   Wikipedia

• Ultramafic rock — Ultramafic (also referred to as ultrabasic) rocks are igneous and meta igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark… …   Wikipedia

• Gabbro — (pronEng|ˈɡæbrəʊ) is a dark, coarse grained, intrusive igneous rock chemically equivalent to basalt. It is a plutonic rock, formed when molten magma is trapped beneath the Earth s surface and cools into a crystalline mass. The vast majority of… …   Wikipedia

• Roca ultrabásica — Saltar a navegación, búsqueda Las rocas ultrabásicas (también referida como ultramáficas) son rocas ígneas y meta ígneas con muy bajo sílice (menos de 45%), generalmente >18% MgO, alto FeO, bajo potasio, y se compone de usualmente más de 90%… …   Wikipedia Español

• Crust (geology) — Geologic provinces of the world (USGS)   Shield …   Wikipedia