Icelandite - Icelandic rock (English spelling)
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A tholeiitic andesite that occurs in the ocean and is not orogenic, but on continental margins or island arcs [Carmichael: 1964]. It is rich in Fe and poor in Al 2 O 3 . In general, the Al 2 O 3 /(Fe 2 O 3 +FeO) value for andesite is greater than 2.0, but in icelandite it is less than 2.0 [Bowes: 1989, Middlemost: 1985]. It is named after the island of Iceland. Source: Asakura Publishing Dictionary of Petrology Information |
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大陸縁や島弧ではなく，非造山性で海洋に産するソレアイト質安山岩［Carmichael : 1964］．Feに富みAl2O3に乏しく，一般に安山岩ではAl2O3/（Fe2O3＋FeO）の値は2.0よりも大きいが，アイスランダイトでは2.0以下である［Bowes : 1989, Middlemost : 1985］．アイスランド（Iceland）島に因む． 出典 朝倉書店岩石学辞典について 情報 |
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