Abstract
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.
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