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1995年夏季航次冲绳海槽地质、地球物理调查对海底岩石实施拖网取样，在与那国海底洼地西南边线采集到新鲜玄武岩样品。对岩石样品进行了薄片鉴定、岩石化学分析、稀土和微量元素分析以及银同位素分析等。结果表明，岩石为橄榄拉斑玄武岩，岩石微量元素和稀土元素分布具有地慢柱洋中脊玄武岩的特点；成岩熔浆来自上地慢，分异程度较低，混合作用较弱，结晶液线温度为1150－1200℃。
In the summer of 1995, the Okinawa Trough geology and geophysical survey carried out trawling of seabed rocks and collected fresh basalt samples along the southwestern edge of the submarine depressions. The rock samples were identified by thin section, petrochemical analysis, rare earth and trace element analysis and silver isotope analysis. The results show that the rock is characterized by olive tholeiitic basalts, and the distribution of trace elements and rare earth elements in the rocks is characterized by slow basal middling ridges. The diagenetic magma comes from the upper slow, with low degree of differentiation and weak mixing. The crystallization liquid line The temperature is 1150-1200 ° C.