This paper presents new data on rocks dredged from the Hahajima Seamount during the cruise KH03-3 of R/V Hakuho-Maru in 2003. It is shown that the seamount is a tectonically displaced block of the Earth’s crust composed of island-arc ophiolites. The basement of the ophiolite complex is made up of highly depleted mantle residue (dunites and harzburgites). Upward, they grade into cumulate lherzolites, various gabbroids, dolerites, and basalts. This complex marks the initial stages of island-arc evolution: formation of an oceanic crust of the marginal sea. Upward, the section is built up of the island-arc rock association consisting of tholeiites, boninites, and adakites. New data on mineralogy and geochemistry of the studied rocks are reported. The ophiolitic complex served as the basement for island-arc association and was affected by the powerful heat flow that resulted in repeated melting of mantle residue and metamorphism of the above rocks.

中文翻译：

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Hahajima海山的岛弧蛇绿岩（菲律宾波宁海沟）

本文介绍了在R / V Hakuho -Maru轮KH03-3巡航期间从Hahajima Seamount挖出的岩石的新数据结果表明，海山是2003年由岛弧蛇绿岩构成的地壳的构造位移块。蛇绿岩复合物的地下室由高度耗尽的地幔残渣（杜尼铁矿和哈兹伯格岩）组成。向上，它们分为累积的钙铝沸石，各种辉石，白云母和玄武岩。这种复合体标志着岛弧演化的初期阶段：边缘海的洋壳形成。向上部分是由弧形岩石组成的，由冲孔石，邦尼石和，石组成。报道了研究岩石的矿物学和地球化学的新数据。脂石复合体是岛弧结合的基础，并受到强大的热流的影响，热流导致地幔残渣反复熔化和上述岩石的变质。