...The lower part of the rock mass is ultrabasic, rich in Mg and poor in Fe, while the upper part is basic, neutral, and acidic, poor in Mg and rich in Fe. There are several layers of concentrated chromite, as well as a layer of concentrated platinum group metals called the Merensky reef and a part of concentrated vanadium-bearing magnetite, making it a large deposit. [Suwa Kaneichi]... *Some of the terminology that refers to "Merensky reef" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…岩体の下部ほど超塩基性で岩石はMgに富みFeに乏しく,上部にいくほど塩基性,中性,酸性となり,Mgに乏しくFeに富んでくる。何枚ものクロム鉄鉱の濃集した層があるほか,メレンスキー層Merensky reefとよばれる白金族金属の濃集した層,含バナジン磁鉄鉱の濃集した部分等があり,大規模な鉱床となっている。【諏訪 兼位】。… ※「Merensky reef」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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