Tagiri, Michio; Dunkley, Daniel; Adachi, Tatsuro; Hiroi, Yoshikuni; Fanning, Christopher
Ion microprobe dating of zircon from meta-igneous samples of the Hitachi metamorphic terrane of eastern Japan yields Cambrian magmatic ages. Tuffaceous schist from the Nishidohira Formation contains ca 510Ma zircon, overlapping in age with hornblende gneiss from the Tamadare Formation (ca 507Ma), and meta-andesite (ca 507Ma) and metaporphyry (ca 505Ma) from the Akazawa Formation. The latter is unconformably overlain by the Carboniferous Daioin Formation, in which a granite boulder from...[Show more]
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