SHRIMP U-Pb Zircon Age of the Inishi Migmatite around the Kamioka Mining Area, Hida Metamorphic Complex, Central Japan |
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| Authors: | Masatoshi Sakoda Takashi Kano C. Mark Fanning Takaaki Sakaguchi |
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| Affiliation: | Metals Technology Center, Japan Oil, Gas and Metals National Corporation, Kosaka-kozan, Kosaka-machi, Akita 017–0202, Japan [e-mail: ];Department of Earth Sciences, Yamaguchi University, Yoshida 1677–1, Yamaguchi 753–8512, Japan;Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia |
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| Abstract: | Abstract. SHRIMP U-Pb ages were determined on single zircons separated from the Inishi migmatite in the Kamioka mining area, Hida metamorphic complex, central Japan. Twenty one determinations were distributed within the age of 234.2±1.8 Ma, excluding one inner core of a grain. As the analyzed crystals were mostly euhedral igneous zircons, the age indicates the crystallization of zircons from granitic melt during the formation of Inishi migmatite. The age of ca. 234 Ma corresponded to the later stage of the major regional metamorphic event in the Hida complex, while the age of ca. 265 Ma determined in a grain suggested the inherited age of the earlier phase of the metamorphism. |
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| Keywords: | SHRIMP U-Pb zircon age Inishi migmatite Kamioka mine Hida gneiss |
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