兵庫県姫路市，家島諸島に分布する後期白亜紀火山岩類のジルコン U-Pb 及び FT 年代

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タイトル別名
  • Zircon U-Pb and fission-track ages of Late Cretaceous volcanic rocks of the Ieshima Islands, southwest Japan
  • ヒョウゴケン ヒメジシ,カトウ ショトウ ニ ブンプ スル コウキ ハクアキ カザンガンルイ ノ ジルコン U-Pb オヨビ FT ネンダイ

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説明

The Ieshima Islands, in the eastern Seto Inland Sea of southwest Japan, are dominated by sedimentary complex in the Tamba Belt, Late Cretaceous volcanic and plutonic rocks, and Quaternary sediments. The Late Cretaceous volcanic rocks consist mainly of dacite pumiceous lapilli tuff, rhyolite welded crystal tuff, and rhyolite tuff breccia. Here, they are described for the first time as the Ieshima Formation. Rhyolite welded crystal tuff overlies the dacite pumiceous lapilli tuff, and both are intruded by plutonic rocks. I present laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) zircon U-Pb and fission-track (FT) ages of the rhyolite welded crystal tuff. U-Pb ages of individual zircons range from 86.0 to 104.5 Ma, and show a bimodal distribution with peaks at ca. 90 and 100 Ma. The younger cluster (89.8 ± 0.9 Ma, n = 19) corresponds the eruption age of the felsic volcanic rocks of the Ieshima Formation, while the older grains may be inherited from the basement rocks. The FT age (76.1 ± 2.5 Ma) is significantly younger than the U-Pb dating age, and represents thermal resetting by concealed plutonic rocks.<br>

収録刊行物

  • 岩石鉱物科学

    岩石鉱物科学 45 (2), 53-61, 2016

    一般社団法人　日本鉱物科学会

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