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Low-temperature thermochronology of the Izu collision zone, central Japan; Implications for mountain building at an active arc-arc collision zone

伊豆衝突帯の低温熱年代学; 現生の島弧衝突帯の山地形成への示唆

末岡 茂   ; 小林 侑生*; 福田 将眞   ; Kohn, B. P.*; 横山 立憲   ; 佐野 直美*; 長谷部 徳子*; 田村 明弘*; 森下 知晃*; 田上 高広*

Sueoka, Shigeru; Kobayashi, Yumi*; Fukuda, Shoma; Kohn, B. P.*; Yokoyama, Tatsunori; Sano, Naomi*; Hasebe, Noriko*; Tamura, Akihiro*; Morishita, Tomoaki*; Tagami, Takahiro*

山地形成過程を明らかにするために、中部日本の現生の島弧衝突帯である伊豆衝突帯を対象としてマルチシステム熱年代測定法を適用した。花崗岩中のジルコンのU-Pb年代、アパタイトの(U-Th)/He年代およびフィッション・トラック年代から、関東山地は約5Maの丹沢ブロックでの衝突に伴って隆起したと考えられる。伊豆衝突帯での山地形成は、主に伊豆・小笠原弧の地殻ブロックの衝突とフィリピン海プレートの運動変化によって制御されている。

Multi-system thermochronometries were applied to the Izu collision zone, an active arc-arc collision zone in the central Japan, in order to reveal the mountain formation process. Nine granitic samples yielded zircon U-Pb ages of 10.2-5.8 Ma (n = 2), apatite (U-Th)/He ages of 42.8-2.6 Ma (n = 7), and apatite fission-track (AFT) ages of 44.1-3.0 Ma (n = 9). Thermal inversion analyses based on the AFT data suggest rapid cooling events at ca 5 Ma and 1 Ma in the collision zone and no such thermal/tectonic effect out of the zone. The Kanto Mountains are thought to be uplifted domally associated with the collision of the Tanzawa Block at ca 5 Ma. The Minobu Mountains and possibly the adjacent mountains could be uplifted by the collision of the Izu Block at ca 1 Ma. Mountain formation in the Izu collision zone is mainly controlled by the collisions of crustal blocks of the Izu-Bonin Arc and motional change of the Philippine Sea plate.

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