Metamorphic evolution of the Kamuikotan high-pressure and low- temperature metamorphic rocks in central Hokkaido, Japan

M. Sakakibara, T. Ota

    Research output: Contribution to journalArticlepeer-review

    24 Citations (Scopus)

    Abstract

    The Kamuikotan complex in the Sorachi-Yezo belt has been extensively subjected to subduction-related high-pressure and low-temperature metamorphism. On the basis of geological, petrological, and geochronological data, the coherent metamorphic rocks are divided into six units which can be classified into the following three baric types: high-pressure 1, high-pressure 2, and high-pressure intermediate. The results, together with the previously published K-Ar and 40Ar-39Ar ages, suggest that the Kamuikotan metamorphic rocks gradually decreased in pressure during the Cretaceous. This tendency indicates an increase in the Kamuikotan subduction geotherm during Early Cretaceous to early Eocene time. -from Authors

    Original languageEnglish
    Pages (from-to)22,221-22,235
    JournalJournal of Geophysical Research
    Volume99
    Issue numberB11
    DOIs
    Publication statusPublished - 1994

    ASJC Scopus subject areas

    • Geophysics
    • Forestry
    • Oceanography
    • Aquatic Science
    • Ecology
    • Water Science and Technology
    • Soil Science
    • Geochemistry and Petrology
    • Earth-Surface Processes
    • Atmospheric Science
    • Earth and Planetary Sciences (miscellaneous)
    • Space and Planetary Science
    • Palaeontology

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