捕虏岩(英语:Xenolith)又称捕获岩掳获岩,是一种岩石碎片,被上升的岩浆从周围岩壁捕虏、随着岩浆上涌到地壳,变成该岩浆冷却后形成的火成岩中包裹体。捕虏岩矿物组成一般与包裹它的火成岩不一样[1]

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捕虏岩的一种

研究捕虏岩可得知有关地幔组成的资料。玄武岩金伯利岩菱镁矿斑岩等,它们原产于上地幔,通常含有捕虏岩,例如玄武岩中的纯橄榄岩(英语:dunite)、橄榄岩(英语:peridotite)和尖晶二辉橄榄岩(英语:spinel lherzolite)的捕虏岩就是代表在原地幔的岩石[2]

参考文献

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