Multi-chronology of volcanic rocks leading to reliable age estimates of volcanic activity: an example from the Setouchi volcanic rocks on Shodo-Shima Island, SW Japan

DOI Web Site Web Site 10 Citations 50 References
  • Tatsumi Yoshiyuki
    Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Tani Ken-ichiro
    Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Sato Keiko
    Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Danhara Tohru
    Kyoto Fission-Track Co. Ltd.
  • Hyodo Hironobu
    Research Institute of Natural Sciences, Okayama University of Science
  • Kawabata Hiroshi
    Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Hanyu Takeshi
    Institute for Research on Earth Evolution (IFREE), Japan Agency for Marine-Earth Science and Technology (JAMSTEC)
  • Dunkley Daniel J.
    National Institute of Polar Research

Bibliographic Information

Other Title
  • マルチ年代測定による信頼性の高い火山活動年代の推定：小豆島に分布する瀬戸内火山岩類への適用
  • マルチ ネンダイ ソクテイ ニ ヨル シンライセイ ノ タカイ カザン カツドウ ネンダイ ノ スイテイ ショウドシマ ニ ブンプ スル セトウチ カザンガンルイ エ ノ テキヨウ

Search this article

Abstract

Four samples of the Setouchi volcanic rocks from two different Miocene formations on Shodo-Shima Island, SW Japan, were dated multi-chronologically using whole-rock and mineral K-Ar and Ar-Ar, zircon fission-track, and zircon U-Pb techniques, in order to better estimate their eruption ages. Statistical and chronological analyses of the results suggest that the lower and upper formations formed at 14.3-14.4 Ma and 13.1-13.4 Ma, respectively, which is consistent with geological relationships. U-Pb dating tends to show a reliable eruption age for analyses of magmatic zircon, and fission-track dating is suitable for determining the eruption age if the sample is largely free of thermal alteration. A careful examination of the contribution of old basement rocks and alteration is required to constrain the eruption age based on Ar-Ar plateau and K-Ar age data. The ubiquitous occurrence of xenocrystic zircon, even in the least-differentiated high-Mg andesite, indicates the involvement of pre-existing crust in the magma. The U-Pb ages of these zircons reveal the involvement of Late Cretaceous granitic basement, as well as older components.

Journal

Citations (10)*help

See more

References(50)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top