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komatiite
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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
Komatiite — Échantillon de komatiite. La komatiite est une roche volcanique ultramafique (ou ultrabasique). Elle tient son nom de la rivière Komati, en Afrique du Sud, où elle est particulièrement visible. Leur formation implique un taux de fusion partielle… … Wikipédia en Français
komatiite — n. ultramafic rock with a non amassed texture assumed to be extrusive … English contemporary dictionary
komatiite — [kə matɪʌɪt] noun Geology a magnesium rich extrusive rock, often with a characteristic texture of criss crossing olivine crystals. Origin 1960s: from Komati (a river in southern Africa) + ite1 … English new terms dictionary
komatiite — … Useful english dictionary
Widgiemooltha Komatiite — The Widgiemooltha Komatiite is a formation of komatiite in the Yilgarn Craton of Western Australia. Stratigraphy The stratigraphy of the Widgiemooltha Komatiite is well known to be part of the regional komatiite magmatic event also seen at the… … Wikipedia
Komatiites — Komatiite Échantillon de komatiite. La komatiite est une roche volcanique ultramafique. Elle tient son nom de la rivière Komati, en Afrique du Sud, où elle est particulièrement visible. Les komatiites sont très rares et essentiellement limités… … Wikipédia en Français
Komatiit — Handstück aus dem Abitibi Grünsteingürtel nahe Englehart, Kanada. Handstück ist 9 cm breit. Die typischen klingenförmigen Olivinkristalle sind sichtbar, eine Spinifex Textur ist in diesem Handstück jedoch schwach bis fehlend Komatiite sind… … Deutsch 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
Superior craton — in the west. The western margin extends from northern Minnesota through eastern Manitoba to northwestern Ontario.The formation of the Superior craton is best explained within the context of 2.72 2.68 Ga accretion of small continental plates and… … Wikipedia
