platinum group elements
51Cumulate 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… …
52Superior 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… …
53Duluth Complex — Shaded relief image showing Duluth Complex arcing from Duluth to Pigeon Point, interrupting and splitting the Mesabi and Gunflint Ranges The Duluth Complex, the related Beaver Bay Complex (often treated as part of the Duluth Complex),[1] and the… …
54Stillwater igneous complex — The Stillwater igneous complex is a large ultramafic to mafic layered intrusion located in southern Montana in Stillwater, Sweet Grass and Park Counties. The complex is exposed across 30 miles (48 km) of the north flank of the Beartooth Mountain… …
55Galène — Pour les articles homonymes, voir Galène (homonymie). Galène Catégorie II : sulfures et sulfosels[1] …
56Michael Lesher — Carl Michael Lesher (born 1951) is an American Canadian geologist. He is an authority on the geology and origin of nickel copper platinum group element deposits, especially those associated with komatiites, their physical volcanology and… …
57Friedel Sellschop — Infobox Scientist name = Friedel Sellschop image width = 130px caption = birth date = June 8, 1930 birth place = Luderitz, Namibia residence = South Africa nationality = South African death date = August 4, 2002 death place = field = Physics work …
58Ultramafic 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… …
59Southern Africa — [ right|thumb|350px legend|#00ff00|Southern African Development Community (SADC)] Southern Africa is the southernmost region of the African continent, variably defined by geography or geopolitics. Within the region are numerous territories –… …
60Fusion au peroxyde — Exemple de système automatisé : le « Peroxide Fluxer » de CLAISSE La fusion au peroxyde est une méthode éprouvée de préparation d’échantillons pour l’analyse par ICP (torche à plasma), par AA (absorption atomique) et/ou par voie… …
