TrekGEO > Mineral Trail > Kanto region > Saitama pref. > Yoshimi

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Hattanda, Yoshimi city, Hiki county, Saitama pref., Japan


Greenschist facies metamorphic rocks

Ba and Sr-bearing zeolites in sandstone and mudstone of the accretionary complex subjected to Greenschist facies metamorphism as a low grade part of the early Paleocene (64 Ma) high-P Yoshimi metamorphic rocks. The Yoshimi metamorphic rocks may be a part of the Sambagawa metamorphic belt. The age of the zeolite formation has not been reported but is younger than metamorphism. The metamorphic age was determined by U-Pb SHRIMP dating of Zircon.


Outcrop of the Yoshimi metamorphic rocks. White veins in the outcrop are phillipsite-Ca and phillipsite-Ba with minor amount of chabazite-Ca and calcite. The protolith of the gray host rock is probably quartz-rich sandstone and mudstone.

Reported Minerals

Mineral Assemblages

  • Phillipsite-Ca - Chabazite-Ca
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