《Table 1.The major (%) , trace element and REE (×10–6) data of the samples from WPSP of this study》下

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《Geochemistry and age of seamounts in the West Pacific: mantle processes and petrogenetic implications》

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Note:LOI is abbreviated from loss on ignition.

The results of major and trace element analyses are presented in Table 1，and isotopic data is provided in Table 2.Representative electron probe micro-analyzer（EPMA）results from olivine phenocrysts in seamount basalts are presented in Table 3；Figure 2 shows micrographs of olivine phenocrysts.The MgO content shows a large range from 2.20%to 9.06%，and Mg#[Mg2+/（Mg2++Fe2+）]is from 0.13 to 0.39，indicative of strong magma fractionation.The TiO2 content is high（generally greater than2%），as is the Fe2O3 content（average value 13.27%）.The basaltic samples of the Magellan seamount are all classified as alkaline and fall in the Oceanic Island Alkali（OIA）basalt range（Fig.3）.The REE pattern and spider diagram of the samples in this study show OIB-like patterns（Fig.4）.The range of 87Sr/86Sr is 0.704 60to 0.706 24，for 206Pb/204Pb，it is 18.241 to 18.599，and for143Nd/144Nd，it is 0.512 646 to 0.512 826.