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Two pulse intrusive events of the Pliocene Tanigawa-dake granites revealed from zircon U-Pb dating

ジルコンU-Pb年代測定で解明された鮮新世谷川岳花崗岩類の2回の貫入イベント

南 沙樹*; 長田 充弘   ; 末岡 茂   ; 福田 将眞   ; 梶田 侑弥*; 小北 康弘  ; 鏡味 沙耶   ; 横山 立憲   ; 田上 高広*

Minami, Saki*; Nagata, Mitsuhiro; Sueoka, Shigeru; Fukuda, Shoma; Kajita, Yuya*; Ogita, Yasuhiro; Kagami, Saya; Yokoyama, Tatsunori; Tagami, Takahiro*

We performed zircon U-Pb dating on the Pliocene Tanigawa-dake granites (Makihata and Tanigawa bodies) and the Cretaceous Minakami quartzdiorite, Northeast Japan Arc. Concordia ages were estimated to be 3.95 $$pm$$ 0.11 Ma ($$pm$$ 2 sigma) for the Makihata body, 3.18 $$pm$$ 0.13 Ma and 3.32 $$pm$$ 0.15 Ma for the Tanigawa body, and 109.4 $$pm$$ 2.2 Ma for the Minakami quartzdiorite. The Minakami quartzdiorite is possibly correlated to the bedrock in the Ashio belt because the age of the Minakami quartzdiorite is consistent with the zircon U-Pb ages of the earliest Tadamigawa granites (107-62 Ma) which are distributed to the northeast of the Tanigawa-dake region and belong to the Ashio belt. All the zircon U-Pb ages of the Tanigawa-dake granites are older than the previously reported cooling ages, i.e., K-Ar ages and zircon fission-track ages, being consistent with their difference in closure temperature. On the basis of these results, we concluded that the intrusive ages of the Tanigawa-dake granites are ~4-3 Ma, which are among the youngest exposed plutons on Earth. The U-Pb ages of the Makihata body and the Tanigawa body are different significantly in the 2 sigma error range. Thus, the Tanigawa body intruded later than the Makihata body by ~0.7 Myr.

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分野:Geosciences, Multidisciplinary

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