Early Carboniferous radiolarians discovered from the Hayachine Terrane, Northeast Japan: the oldest fossil age for clastic rocks of accretionary complex in Japan

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  • Uchino Takayuki
    Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University
  • Kurihara Toshiyuki
    Department of Geology, Faculty of Science, Niigata University
  • Kawamura Makoto
    Division of Earth and Planetary Sciences, Graduate School of Science, Hokkaido University

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Other Title
  • 早池峰帯から発見された前期石炭紀放散虫化石－付加体砕屑岩からの日本最古の化石年代－
  • ハヤチネ タイ カラ ハッケン サレタ ゼンキ セキタンキ ホウサンチュウ カセキ フカタイ サイセツガン カラ ノ ニホン サイコ ノ カセキ ネンダイ

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Abstract

Early Carboniferous radiolarians were newly discovered from siltstone of the Nedamo Complex in the Hayachine Terrane, Northeast Japan. This siltstone and other clastic rocks along with greenstone and chert are the components of an accretionary complex. Radiolarian fauna contains Palaeoscenidium cladophorum Deflandre that ranges in age from Early or Middle Devonian to Early Carboniferous. Since the Fe-Mn chert intercalated in a MORB-type basalt of the Nedamo Complex was assigned an age of Late Devonian (Hamano et al., 2002), the accretionary age of the Hayachine Terrane is no older than Late Devonian, most probable Early Carboniferous. This is the first report of an Early Carboni-ferous accretionary complex recognized by biostratigraphic data in Japan.<br>

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