Manganese formations in the accretionary belts of Japan: Implications for subduction-accretion process in an active convergent margin

M. Nakagawa, M. Santosh, S. Maruyama

    Research output: Contribution to journalArticlepeer-review

    16 Citations (Scopus)

    Abstract

    In the accretionary complexes of Japan, many bedded manganese and iron-manganese ore deposits occur, especially in the Jurassic complexes such as the Chichibu, Tamba, Mino, Ashio and Northern Kitakami belts. The manganese ores in these Jurassic accretionary complexes probably formed from manganese nodule/crust-bearing siliceous sediments on deep-sea floor and were subsequently converted to the manganese ores by metamorphism during the subduction-accretion process. Some of the deposits also show the signatures of younger granitic intrusions. The manganese formations now incorporated within these belts are marker beds of accretionary tectonics associated with plate tectonic processes in convergent margins.

    Original languageEnglish
    Pages (from-to)208-222
    Number of pages15
    JournalJournal of Asian Earth Sciences
    Volume42
    Issue number3
    DOIs
    Publication statusPublished - Aug 10 2011

    Keywords

    • Accretionary complex
    • Deep-sea Mn-Fe nodules
    • Japan
    • Manganese deposit
    • Metamorphism
    • Tectonics

    ASJC Scopus subject areas

    • Geology
    • Earth-Surface Processes

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