地幔水化及水在大火成岩省形成中的作用

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大火成岩省的形成受控于多种因素,包括异常的地幔温度、易熔饱满组分的存在、地幔源中的挥发分和减压的程度.在一个具体大火成岩省中,所有的因素缺少完整的检验导致了地幔柱模型存在争议.这里,我们报道了估算的来自中国西南峨眉山大火成岩省的辉石中水的含量.尽管这些辉石表现出类岛弧的水含量(达到3.4%),微量元素特征并不支持俯冲带的设定但是指示了深处地幔的含水储层.结合之前的研究,我们提出含水的热地幔在显生宙偶尔出现制造了大陆大火成岩省(例如:塔里木、西伯利亚圈闭和卡鲁).地幔柱形成深处地幔含水储层的广泛例子表明,地球内部大范围水化.
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