Memoirs of the Faculty of Education, Shimane University. Natural science

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Memoirs of the Faculty of Education, Shimane University. Natural science 29
1995-12 発行

二次イオン質量分析法による隠岐島後産泥質片麻岩のジルコン年代(予報)

Preliminary SIMS Zircon Age of Pelitic Gneiss from Oki-Dogo Island,Southwest Japan
Tsunogae, Toshiaki
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Description
Single zircon U-Pb analytical technique by SIMS (secondary ion mass spectrometry) was applied to metasediment from Oki-Dogo Island, southwest Japan. ^<207>Pb/ ^<206>Pb age of zircons comprise three generations; 2.3, 2.0, and 1.7 Ga. Well-rounded crystal shape of the analyzed zircons suggests that the sediments are detritus of a continental land mass which was Proterozoic in age. The age dispersion may be attributed to at least three individual magmatic activities in the Proterozoic continent.