A type of igneous deposit. Sometimes simply called a magmatic deposit. A deposit formed when useful minerals crystallize and concentrate from magma. Deposits formed by magma with a different composition from normal magma include sulfide mineral deposits (nickel, platinum group elements), carbonatite (rare earth elements), and certain iron deposits (magnetite, hematite, apatite). The region centered on Sudbury in Canada is the world's largest nickel ore producing area. Deposits formed by normal magma include titanium deposits and chromium deposits. Source : Heibonsha Encyclopedia About MyPedia Information |
火成鉱床の一種。たんにマグマ鉱床と呼ぶこともある。マグマから有用鉱物が晶出・濃集して形成された鉱床。通常のマグマとは異なる組成のマグマによるものに硫化鉱物鉱床(ニッケル,白金属元素),カーボナタイト(希土類元素),ある種の鉄鉱床(磁鉄鉱,赤鉄鉱,リン灰石)などがある。カナダのサドベリーを中心とする地方は世界最大のニッケル鉱産地となっている。通常のマグマによるものにはチタン鉱床,クロム鉱床などがある。
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