Abstract
New data on the Hf, Pb, and Nd isotopes of the mafic rocks of various ages from Kunashir Island were used to address the nature of the subarc mantle of the southern segment of the Kuril island arc. At least since Late Cenozoic, its isotopic characteristics have been the MORBtype mantle of the Indian Ocean. Its boundary with the mantle reservoir of the Pacific MORBtype coincided probably with the Kuril-Kam� chatka Trench.
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