国际大洋发现计划 (IODP) 第367航次在南海北部洋陆过渡带U1500站位钻取的新鲜洋壳玄武岩，是研究南海形成初期岩浆活动的理想材料。项目拟在岩相观察和全岩元素地球化学的基础上，对该玄武岩斑晶和其熔体包裹体进行原位元素地球化学分析，并对斜长石斑晶进行原位Sr同位素地球化学分析。通过以上分析和地球化学研究，探讨南海形成初期洋中脊岩浆房演化的精细过程和玄武岩的地幔源区组成，研究早渐新世南海扩张初期的洋壳增生机制。

International Ocean Discovery Program (IODP) Expedition 367 drilled fresh mid-ocean ridge basalt (MORB), which provides ideal materials to study the magmatic activity in the initial spreading stage of the South China Sea, at Site U1500 in the continent-ocean transition zone from the northern South China Sea. On the base of petrographic observations and whole rock elemental geochemistry, this project intends to present in situ elemental compositions of minerals and mineral host melt inclusions as well as in situ Sr isotopic compositions of plagioclase. We prepare to assess the detailed processes of magma chamber evolution and the nature of mantle source. After that, we can understand the mechanisms of oceanic crustal accretion in the initial spreading stage of the South China Sea in the early Oligocene.