Geochemistry and magmatic zircon U–Pb dating of amphibolite blocks in the Omi serpentinite mélange, north central Japan: Possible subduction of the Cambrian oceanic crust

Early Paleozoic serpentinite melanges in Japan preserve the oldest high–P metamorphic rocks in the circum–Pacific orogenic belt. To understand the tectonic regime at the subduction initiation of the proto–Japan convergent plate boundary, whole–rock geochemistry, and zircon U–Pb geochronology were in...

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