Heterogeneity of subduction zone mantle: Towards geochemical tomography

我们根据弧形火山岩的成分，通过对板岩派生成分的评价，成功地估算了地幔的同位素组成及其全球分布。与大洋玄武岩的联合分析首次揭示了东西半球结构的存在：东半球的地幔富含俯冲的亲水性成分，可能是通过向东半球曾经存在的超大陆聚焦俯冲而进入地幔的，而西半球的地幔则不存在。

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.