Geochemical and isotopic characteristics of the Kinan Seamount Chain in the Shikoku Basin

H. Sato, S. Machida, S. Kanayama, H. Taniguchi, T. Ishii

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    Abstract

    The Kinan Seamount Chain lies close to the extinct spreading center of the Shikoku Basin, one of the largest marginal basins in the western Pacific region. Geochemical and isotopic analyses reveal that basalts from the Kinan Seamount Chain have the following characteristics that differ from the Shikoku Basin tholeiite: 1) more incompatible emelent enriched compositions, 2) lower abundance of the heavy rare earth elements (HREE), and 3) higher 87Sr/86Sr and lower 143Nd/144Nd ratios. These results indicate: 1) a more enriched mantle source for basalts from the Kinan Seamount Chain, 2) existence of clinopyroxene and/or amphibole in their residual mantle, and 3) mixing of magmas from a normal MORB source with the EMI signature and an ocean-island basalt (OIB) source with the EMII signature; and 4) the latter has a more significant contribution to the Kinan Seamount Chain basalts than the Shikoku Basin tholeiite.

    Original languageEnglish
    Pages (from-to)519-526
    Number of pages8
    JournalGeochemical Journal
    Volume36
    Issue number5
    Publication statusPublished - 2002

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    ASJC Scopus subject areas

    • Geochemistry and Petrology
    • Geophysics

    Cite this

    Sato, H., Machida, S., Kanayama, S., Taniguchi, H., & Ishii, T. (2002). Geochemical and isotopic characteristics of the Kinan Seamount Chain in the Shikoku Basin. Geochemical Journal, 36(5), 519-526.