Heterogeneity of subduction zone mantle: Towards geochemical tomography

在弧火山岩的基础上，通过对板块衍生组分的评价，成功地估算了地幔同位素组成及其全球分布。结合海洋玄武岩的分析，首次揭示了东西半球结构的存在：东半球地幔富含俯冲的亲水成分，可能是通过向东半球曾经存在的超大陆的集中俯冲带进地幔的，而西半球则不是。

We have successfully estimated the mantle isotopic compositions and their global distribution, based on the compositions of arc volcanic rocks, by evaluating the slab-derived components. A combined analysis with oceanic basalts has revealed for the first time the presence of east-west hemispherical structure: the mantle in the eastern hemisphere is enriched in subducted hydrophile components, being possibly brought into the mantle by focused subduction towards the supercontinent once existed in the eastern hemisphere, whereas that in the western hemisphere is not.