fractional magma
51Lamprophyre — Lamprophyres (Greek λαµπρός (lamprós) = bright and φύρω (phýro) = to mix) are uncommon, small volume ultrapotassic igneous rocks primarily occurring as dikes, lopoliths, laccoliths, stocks and small intrusions. They are alkaline silica… …
52Rapakivi granite — is a hornblende biotite granite containing large rounded crystals of orthoclase mantled with oligoclase. The name has come to be used most frequently as a textural term where it implies plagioclase rims around orthoclase in plutonic rocks.… …
53Isotopes of rubidium — Rubidium (Rb) has 24 isotopes, with naturally occurring rubidium being composed of just two isotopes; Rb 85 (72.2%) and the radioactive Rb 87 (27.8%). Normal mixes of rubidium are radioactive enough to fog photographic film in approximately 30 to …
54Compatibility (geochemistry) — In geochemistry, compatibility is a measure of how readily a particular trace element substitutes for a major element within a mineral. Compatibility of an ion is controlled by two things: its valence and its ionic radius. Both must approximate… …
55Anthony J. Naldrett — Anthony James Tony Naldrett, FRSC (born 1933) is a Canadian geologist. He is an authority on the geology and origin of nickel copper platinum group element deposits, the tectonic setting in which they occur, the petrology of associated rocks, and …
56Roca 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%… …
57charnockite — ▪ rock any member of a series of metamorphic rocks with variable chemical composition, first described from the state of Tamil Nadu in southern India and named for Job Charnock. The term is often limited to the characteristic orthopyroxene… …
