日本地球惑星科学連合2015年大会

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インターナショナルセッション（ポスター発表）

セッション記号 S (固体地球科学) » S-MP 岩石学・鉱物学

[S-MP09] Supercontinents and Crustal Evolution

2015年5月27日(水) 18:15 〜 19:30 コンベンションホール (2F)

コンビーナ:*Madhusoodhan Satish-Kumar(Department of Geology, Faculty of Science, Niigata University)、Yasuhito Osanai(Division of Evolution of Earth Environments, Faculty of Social and Cultural Studies, Kyushu University)、Geoffrey H. Grantham(Council for Geoscience, P/Bag X112, Pretoria, SOUTH AFRICA)、Sajeev Krishnan(Centre for Earth Sciences, Indian Institute of Science, Bangalore 560 012, INDIA)、Tomokazu Hokada(National Institute of Polar Research)

18:15 〜 19:30

[SMP09-P10] ジルコンU-Pb年代に基づく阿武隈深成岩体形成史

*昆 慶明1、江島 輝美1、高木 哲一1 (1.産総研・地質調査総合センター)

キーワード：阿武隈, 花崗岩, ジルコン, U-Pb, LA-ICP-MS

Intrusive ages of the Abukuma plutonic rocks, a major Cretaceous granitic suite in the Japan Arc, were determined using zircon U?Pb age method. The U?Pb ages of the ‘Hbl-Bt granitoids’ distributed in the western to central part of the Abukuma Plateau were 113-99 Ma, whereas five ‘east leucocratic granitoids’ intruded within a short time range of 112-106 Ma. The U?Pb ages of a gabbro from the Mt. Katasone and of the ‘western leucocratic granitoid’ were115.2 ± 1.1 Ma and 96.7 ± 1.0 Ma, respectively. The above age distribution combined with geochemical results suggests that. Based on these zircon U?Pb age, significant difference of the intrusive age between ‘east-’ and ‘west leucocratic granitoids’ was indicated.