典型的大洋板内岩浆作用产物不仅包括出露于海平面之上的海岛，还包括沉没在海面之下的海山。然而，目前对板内玄武岩的认识主要来自于对洋岛玄武岩（OIB）的研究。南太平洋的Louisville海山链是规模仅次于夏威夷-皇帝海岭的火山链。IODP 330 航次对Louisville海山链中的4 座海山进行了钻探取样，发现这些海山都由碱性玄武岩组成，是研究板内碱性玄武岩成因的理想对象。通过分析玄武岩中橄榄石斑晶的元素（包括微量元素Ni,Mn,Ca）、稳定同位素（O 和Mg）以及其中熔体包裹体的元素和放射性成因同位素（Sr, Pb）组成，结合全岩的地球化学特征，探讨板内碱性玄武岩的成因及其源区的岩性组成和化学不均一性。

Characters)：Intraplate oceanic basalts include not only those from oceanic islands above the sea level, but also those from seamounts under the sea level. However, understanding of intraplate basalts are mainly from researches on oceanic island basalts. The Louisville Seamount Chain located in the south Pacific is one of the largest volcanic chains in the world, only smaller than the Hawaiian-Emperor Chain in Pacific. The IODP 330 expedition drilled four seamounts of this chain and found that all core samples are alkaline basalts. Therefore, these basalts are ideal samples to study the genesis of intraplate alklaine basalts. Here we analyze the elements (including minor elements, e.g. Ni, Mn, Ca) and stable isotopes (O and Mg) of olivine phenocrysts and the radiogenetic isotopes (Sr, Pb) of the melt inclusions in the olivine phenocrysts, as well as their whole-rock geochemistry, to understand the genesis and the source compositions of these intraplate alkaline basalts.