<b>Data for Late Cenozoic Hainan OIB-like basalts in SE Asia record</b><b> </b><b>the interaction between deep mantle plume and stagnant slab in the mantle transition zone</b>

We present olivine He isotopic compositions and whole-rock Fe-Mo isotopes of Hainan basaltic lavas, along with whole-rock major and trace elements and Sr-Nd-Hf isotopic compositions to constrain their mantle lithology and end-members. Ultimately, we develop a petrogenetic model for the Late Cenozoic basaltic rocks in SE Asia and highlight its broad implications for future research in the mantle geochemistry field.