Middle Devonian–early Carboniferous radiolarian fossils extracted from the conglomerate in the Nedamo Complex, Nedamo Terrane, Northeast Japan

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  • 根田茂帯根田茂コンプレックスの礫岩から見出された 中期デボン紀～前期石炭紀放散虫化石
  • 概報 根田茂帯根田茂コンプレックスの礫岩から見出された中期デボン紀~前期石炭紀放散虫化石
  • ガイホウ コンデンモタイ コンデンモコンプレックス ノ レキガン カラ ミイダサレタ チュウキ デボンキ~ゼンキ セキタンキ ホウサンチュウ カセキ

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Abstract

<p>The latest Middle Devonian to early Carboniferous (Mississippian) radiolarian fossils (e.g. Trilonche cf. vetusta) has been obtained from the muddy matrix or mud-chips in the conglomerate in the early Carboniferous Nedamo Complex of the Nedamo Terrane, Northeast Japan. This conglomerate bed lies conformably on the mudstone bed including early Carboniferous radiolarian fossils reported by the previous study. The conglomerate is also almost composed of terrigenous rock clasts (e.g. felsic tuff, tuffaceous clastic rocks, mudstone), and strongly deformed. The radiolarian fossils in the conglomerate support adequacy of the early Carboniferous accretion age of the Nedamo Complex, which was constrained by the Late Devonian conodont age from the chert in accordance with the oceanic plate stratigraphy. The discovery of the radiolarian fossils in this study is a second report from the terrigenous rocks in the Nedamo Complex. These reports are important to discuss the tectonics of an early Carboniferous island-arc-trench system, because the Nedamo Complex is the only Carboniferous accretionary complex recognizable in the Japanese Islands.</p>

Journal

  • BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN

    BULLETIN OF THE GEOLOGICAL SURVEY OF JAPAN 70 (1-2), 109-115, 2019-03-29

    National Institute of Advanced Industrial Science and Technology, Geological Survey of Japan

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