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野島断層とその周辺の花崗岩質岩から得たジルコンを用いFT年代とLA-ICP-MSによるU-Pb年代を求めたその結果5278 MaのFT年代と8388 MaのU-Pb238U-206Pb年代が得られた今回の結果と既存の放射年代結果から淡路島北端部の花崗岩質岩が貫入した時代から現在に至るまでの冷却史を明らかにした今回U-Pb年代を求めるためにFT年代測定用に準備したジルコンを用いるとともにFish Canyon TuffをU-Pb年代の補正に用いたその結果Buluk Member Tuffで精度と信頼性の高いU-Pb年代16.3±0.1 Maが得られた国内外でジルコンのFTに関する論文は多数あるが今回用いた方法によりFT年代測定用に準備したジルコンを再利用しジルコンの晶出年代を付加することに道を拓くことができたと思われる  Zircon U-Pb dating by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) and zircon fission-track (FT) dating were performed on granitic rocks from the Nojima Fault and its vicinity on northern Awaji Island, Hyogo Prefecture, Japan. The analyses yielded zircon FT ages of 52-78 Ma, which are in agreement with previously reported zircon FT ages. Zircon U-Pb (238U-206Pb) ages of 83-88 Ma were also determined. By combining these results with existing radiometric age data, we estimated the entire cooling history of the granitic basement on northern Awaji Island, spanning the period from the time of intrusion to the present. U-Pb ages were determined from zircons that were prepared for FT dating. Moreover, U-Pb ages were corrected based on analyses of Fish Canyon Tuff zircons as a standard material. As a result, a precise and accurate age of 16.3±0.1 Ma was obtained for the Buluk Member Tuff. This result demonstrates that the effect of common Pb is minimal even when analyzing zircons that are chemically etched, and that the Fish Canyon Tuff, which is a well-known age standard for FT dating, can be used as a standard for U-Pb dating. Many previous studies have reported on zircon FT analyses performed throughout the world. The method applied in the present study should pave the way for adding information on the crystallization age of the studied rocks by analyzing the zircons prepared previously for FT dating

Zircon U-Pb and fission-track ages of granitic rocks from the Nojima Fault and its vicinity: A new horizon for the LA-ICP-MS U-Pb dating method