Unusual cooling of the Middle Miocene Ichifusayama Granodiorite, Kyushu, Japan

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概要

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• K-Ar and FT analyses were carried out on biotite, zircon and apatite from the Middle Miocene Ichifusayama Granodiorite pluton in Kyushu, Japan in order to reveal the cooling history. The core and rim of the pluton revealed K-Ar biotite ages of 13.39-13.36 and 13.31-13.54 Ma, FT zircon ages of 13.3-13.1 and 12.7-12.3 Ma, and FT apatite ages of 13.1-13.7 and 10.6-10.8 Ma respectively, suggesting that the core cooled, to 100 °C from 300 °C, faster than the rim, of which the cooling rate is ∼ 100 °C/Ma. The track-length analyses also suggest extremely rapid cooling without a late stage annealing process. The faster cooling of the core in comparison with the rim is unusual. The difference in cooling velocity between the core and rim was possibly caused by an influence of paleotopography.

• 日本鉱物科学会の論文
• 2006-02-01

著者

• Umeda Koji

  Tono Geoscience Center Japan Atomic Energy Agency

• Oikawa Teruki

  National Inst. Of Advanced Industrial Sci. And Technol. (aist)

• OIKAWA Teruki

  Tono Geoscience Center, Japan Atomic Energy Agency

• KANAZAWA Sunao

  Tono Geoscience Center, Japan Atomic Energy Agency

• MATSUZAKI Tatsuji

  Suncoh Consultants Co. Ltd.

• Kanazawa Sunao

  Tono Geoscience Center Japan Atomic Energy Agency

関連論文

• Late Cenozoic volcanic activity in the Chugoku area, southwest Japan arc during back-arc basin opening and reinitiation of subduction
• AMS ^C dating of lacustrine and pyroclastic deposits in summit crater of Nantai volcano, NE Japan : Evidence of Holocene eruption
• Unusual cooling of the Middle Miocene Ichifusayama Granodiorite, Kyushu, Japan

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