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来自维基百科,自由的百科全书
矽鎂層是地球化學中指富含鎂的矽酸鹽礦物組成的地殼。矽鎂層出露到地表的代表是玄武岩。大洋地殼主要是矽鎂層。[1]
岩石學研究表明,相比矽鋁層,矽鎂層密度更大(2800 到 3300 kg/m3),這是因為鐵、鎂含量更高,鋁含量降低。矽鎂層岩石也叫鐵鎂質。密度最大的矽鎂層岩石是矽含量最少的超基性岩。 [2]
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