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Fission-track ages of late Pliocene to Pleistocene strata around the eastern margin of the Yokote Basin active fault zone, northeast Japan

Kosaka, Hideki*; Kagohara, Kyoko; Miwa, Atsushi*; Imaizumi, Toshifumi*; Kurosawa, Hideki; Nohara, Tsuyoshi   

To understand the development process of the fault zone, fission-track ages of rocks and rock facies are investigated in western margin of the Ou Backbone Range of Northeast Japan. Fission-track dating was carried out for 5 acid volcanic rocks from the late Pliocene to Pleistocene strata which were deposit associated with mountain belt growth. Statistically significant ages obtained are 1.5$$pm$$0.1 Ma (OB-03) and 1.85$$pm$$0.1 Ma (YG-01) for the Tazawa Formation, 1.6$$pm$$0.3 Ma (FT-01) for the Kurisawa Formation,0.93$$pm$$0.14 Ma (FT-02) and 2.7$$pm$$0.3 Ma (FT-03) for the Senya Formation. According to the fission-track dating in this study, ages of the mountain belt growth with acid volcanic activity are estimated to before 1 Ma.

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