Geochemical evolution of koolau volcano. Hawaii

Ryoji Tanaka, Eizo Nakamura, Eiichi Takahashi

    Research output: Chapter in Book/Report/Conference proceedingChapter

    58 Citations (Scopus)


    Major and trace-element and Sr, Nd, and Pb isotopic compositions have been determined for Koolau shield lavas and Nuuanu and Wailau landslide deposits, Hawaii. The Koolau shield is composed of older main shield-stage and younger Makapuu-stage lavas. Lavas of the main shield-stage are exposed low in the subaerial Nuuanu Pali and in Nuuanu landslide deposits. Main shield-stage lavas resemble Loa- or Kea-type compositions; they are characterized by lower Ba/Nb, La/Nb, Pb/Nd, Sr/Nb, Nd/Nb, Zr/Nb, and 87Sr/86Sr, and by higher 143Nd/144Nd and 206Pb/204Pb than those of Makapuu-stage lavas (Koolau-type). Sr-Nd-Pb isotope systematics suggest that Koolau shield lavas were generated from at least three endmembers, such as: Enriched Makapuu (EMK), Depleted Makapuu (DMK), and Kea (KEA) components. The proportion of these endmembers successively changed from earlier KEA-dominated to later EMK-dominated. Koolau shield-stage lavas span nearly the entire range of the isotopic compositions reported previously for shield-stage lavas from all Hawaiian islands, and reveal secular changes in the amounts of plume components.

    Original languageEnglish
    Title of host publicationHawaiian Volcanoes
    Subtitle of host publicationDeep Underwater Perspectives, 2002
    EditorsMichael O. Garcia, Eiichi Takahashi, Jiro Naka, Peter W. Lipman, Shigeo Aramaki
    PublisherBlackwell Publishing Ltd
    Number of pages22
    ISBN (Electronic)9781118668436
    ISBN (Print)9780875909875
    Publication statusPublished - 2002

    Publication series

    NameGeophysical Monograph Series
    ISSN (Print)0065-8448
    ISSN (Electronic)2328-8779

    ASJC Scopus subject areas

    • Geophysics


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