Cenozoic basalts in the South China Sea basin, Hainan Island, Leizhou Peninsula and Longhai—Mingxi in Fujian Province are roughly corresponding to the OIB, which are enriched in HFSE, especially in Nb，Ta，U and Ti. The coexistence of both the P olynesiantype and the Hawaiian or MORBtype lavas in the South China Sea b asin may imply that OIB may be produced on an oceanic ridge and that the entrainment of the upper mantle material may be caused by a rising superplume of a lowermant le orig in. Basalts in the Hainan island and Leizhou Peninsula may have a similar origin . The intraplate basalts about the same age in Longhai—Mingxi have esp ecially high Nb/Y and Nb/Zr ratios, showing that they are of the Polynes iantype. Th e origin of the basalts may be attributed to ① the eclogite residue after the partial melting of old basaltic oceanic crust and its subduction into the lower  mantle; ② the contribution of the lithospheric material (including the lower crust ).