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深成岩(英语:plutonic rock)是一种火成岩,生成于地壳的较深处(>2 km),因为在地下缓慢冷却,使得矿物具有大的结晶粒度。常为斑岩纹理。常见的深成岩有花岗岩、辉绿岩(粗玄岩)。[1][2]
plutonic rock这个英文术语起源于罗马神话中地下世界的主宰冥王普鲁托。十八世纪末水成论与火成论的地质学大论战时命名。pluton也被视为火成侵入的同义词。
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