SHRIMP U-Pb dating of detrital zircons in paragneiss from Oki-Dogo Island, western Japan

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概要

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• We obtained the radiometric ages of detrital zircons from two samples of paragneiss from Oki-Dogo Island, Japan, from the 238U/206Pb ratio and isotopic composition of Pb determined using a Sensitive High-Resolution Ion MicroProbe (SHRIMP II). The zircons show two main age clusters around 2200 Ma and 1800 Ma, with some discordant ages. One zircon grain has a rim with a concordant age of 236 ± 3 Ma, which is consistent with the age of peak metamorphism in the Hida Metamorphic Belt. The modal proportions of zircon ages from Oki-Dogo Island are clearly different from those for paragneiss of the Hida Terrane. This indicates that the Oki Gneiss is derived from an Early Proterozoic rock and is different from the Hida Gneiss in terms of provenance and/or the depositional age of the parent sediment.

• 日本鉱物科学会の論文

著者

• Hidaka Hiroshi

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima Unibersity

• Terada Kentaro

  Department Of Earth And Planetary Sciences Faculty Of Science Hiroshima Unibersity

• Tsutsumi Yukiyasu

  Department Of Geology And Paleontology National Museum Of Nature And Science

• Yokoyama Kazumi

  Department Of Geology And Paleontology National Museum Of Nature And Science

• HORIE Kenji

  Department of Earth and Planetary Sciences, Graduate School of Science, Hiroshima University

• YOKOYAMA Kazumi

  Department of Geology, National Science Museum

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