仙台平野南西部に露出する中部中新統‐鮮新統の年代データ：奥羽脊梁山地の隆起と関連して

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概要

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• 　仙台平野南西部の3つの地質セクションから得られた中部中新統‐鮮新統の年代層序データを報告する．ここで報告する27 個のFT年代測定値と浮遊性有孔虫化石および珪藻化石の分析結果は，調査地域周辺のテクトニックな変動の復元に貢献する．名取川下流の河床に露出する旗立層は地質年代として，ほぼ13 Ma から11.5 Ma に相当する．綱木層はほぼ10 Maから8.3 Maの期間に堆積した地層であり，梨野層下部は6.4 Ma頃に堆積した．年代と層相のデータを総合すると，この中部中新統‐鮮新統には4つの比較的大きな不整合が認められる．それらは9 Ma頃，6.4 Ma頃，最後期中新世，および3.5 Ma頃である．最も古い不整合は本研究で新たに見出された．これらの不整合の形成時期は，Nakajima et al.（2006）が復元した奥羽脊梁山地の段階的な隆起の歴史と良く対応する．本研究で示したデータは，東北本州弧の隆起時期のより詳しい推定を可能にする．

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

著者

• Irizuki Toshiaki

  Department Of Earth Sciences Aichi University Of Education

• DANHARA TOHRU

  Kyoto Fission-Track

• IWANO HIDEKI

  Kyoto Fission-Track Co. Ltd

• Hayashi Hiroki

  Department Of Biomolecular Engineering Graduate School Of Engineering Tohoku University

• Yanagisawa Yukio

  Institute Of Environmental Studies University Of Tokyo

• Fujiwara Osamu

  Active Fault Research Center, National Institute of Advanced Industrial Science and Technology (AIST)

• Shimamoto Masanori

  The Tohoku University Museum

• Yanagisawa Yukio

  Institute of Geology and Geoinformation, National Institute of Advanced Industrial Science and Technology (AIST)

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