Abstract
碳在地球表层和内部圈层之间的循环控制了地球的环境气候变化。海底热液蚀变以及变质作用会使得碳酸盐沉淀到玄武质洋壳中,之后它们在俯冲带经历高压榴辉岩相变质作用会形成碳酸盐化的榴辉岩。俯冲过程可以将这些碳酸盐化的玄武质洋壳榴辉岩带入深部地幔,从而导致地幔在地球化学和岩石学上存在显著的不均一性,并深刻影响着包括部分熔融在内的地幔深部动力学过程。早期对碳酸盐化榴辉岩的实验研究多集中在俯冲带地温梯度下碳酸盐化洋壳榴辉岩的命运,近年来的实验开始研究地幔温压条件下碳酸盐化榴辉岩部分熔融对板内碱性玄武质岩浆源区的潜在影响。本文简要梳理了碳酸盐化榴辉岩在上地幔温压条件下的部分熔融实验,并结合一些天然样品的研究实例,说明碳酸盐化榴辉岩熔体不仅可以作为潜在的地幔交代介质,还可能是板内碱性玄武岩源区的重要组分,它们与橄榄岩发生反应或者与橄榄岩熔体发生混合可以解释板内碱性玄武岩的成分变化。
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