福岡県福津市渡半島に分布する白亜紀花こう岩類の放射年代から見た熱水活動の時期

• 柚原 雅樹

  福岡大学理学部地球圏科学科

• 鮎沢 潤

  福岡大学理学部地球圏科学科

• 大平 寛人

  島根大学総合理工学部地球資源環境学科

• 西 奈保子

  新潟大学大学院自然科学研究科

• 田口 幸洋

  福岡大学理学部地球圏科学科

• 加々美 寛雄

  新潟大学大学院自然科学研究科

書誌事項

タイトル別名

• Timing of hydrothemal activity estimated by radiometric ages of Cretaceous granitic rocks at the Watari Peninsula, Fukutsu City, Fukuoka Prefecture, northern Kyushu
• 福岡県福津市渡半島に分布する白亜紀花崗岩類の放射年代から見た熱水活動の時期
• フクオカケン フクツシ ワタリハントウ ニ ブンプ スル ハクアキ カコウガンルイ ノ ホウシャ ネンダイ カラ ミタ ネッスイ カツドウ ノ ジキ
• Timing of hydrothermal activity estimated by radiometric ages of Cretaceous granitic rocks at the Watari Peninsula, Fukutsu City, Fukuoka Prefecture, northern Kyushu

抄録

The Cretaceous granitic rocks, the Kitazaki Tonalite and Shikanoshima Granodiorite, and veneer Oligocene sedimentary rocks, the Tsuyazaki Formation, are distributed in the Watari Peninsula, Fukuoka Prefecture. There are mineral veins composed by calcite and zeolites in those rocks. Rb-Sr, and fission track geochronological analyses were carried out for granitic rocks, in order to determine the cooling process of granitic rocks and timing of hydrothermal activity. Biotite and felsic fraction separated from the Kitazaki Tonalite and Shikanoshima Granodiorite give Rb-Sr isochron age of 108.6 ± 2.5 Ma and 107.0 ± 0.7 Ma, respectively. Fission track ages from the Kitazaki Tonalite are 97 Ma (titanite), 89-88 Ma (zircon), 14 Ma (apatite). Fission track ages from the Shikanoshima Granodiorite are 95 Ma (titanite), 87-84 Ma (zircon), 15 Ma (apatite). Fission track ages of apatite from granitic rocks are younger than the Tsuyazaki Formation, which suggests a thermal event at about 15 Ma to reset the fission track apatite age. The homogenization temperature of fluid inclusions in calcite are 89-111 °C (Kitazaki Tonalite), 95-118 °C (Shikanoshima Granodiorite) and 85-91 °C (Tsuyazaki Formation). Sr isotopic compositions of calcite and zeolites in granitic rocks and Tsuyazaki Formation are overlap with one another. These data suggest that vein minerals in granitic rocks and zeolites and calcite in the IC Member of the Tsuyazaki Formation were formed by a series of hydrothermal activity at about 15 Ma.

収録刊行物

• 岩石鉱物科学

  岩石鉱物科学 34 (6), 275-287, 2005

  一般社団法人　日本鉱物科学会

キーワード

• Rb-Sr isochron age
• Fission track age
• Kitazaki Tonalite
• Shikanoshima Granodiorite
• Hydrothermal activity
• Tsuyazaki
• Northern Kyushu

詳細情報

• CRID: 1390282681502092032
• NII論文ID: 10016725297
• NII書誌ID: AA1146088X
• DOI: 10.2465/gkk.34.275
• COI: 1:CAS:528:DC%2BD28XmvFCktg%3D%3D
• ISSN: 13497979
• ISSN: 1345630X
• NDL書誌ID: 7772456
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7772456
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可