北西太平洋中緯度地域における浮遊性有孔虫化石帯N.15 帯とN.16帯境界の数値年代
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概要
- 論文の詳細を見る
福島県棚倉地域の久保田層下部について詳細な浮遊性有孔虫生層序を検討した結果,化石帯N.15帯とN.16帯の境界を定義する生層準Neogloboquadrina acostaensisの初産出を凝灰岩鍵層KT-1の直上に認めた.この凝灰岩鍵層の放射年代に基づき,本地域におけるN. acostaensisの初産出年代を10.6 Maと見積もった.これまでに報告されている深海掘削のデータから判断すると,この生層準は少なくとも中緯度地域では同時性を示し,年代対比に有用であると考えられる.
- National Institute of Advanced Industrial Science and Technology, Geological Survey of Japanの論文
著者
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Hayashi Hiroki
Department Of Biomolecular Engineering Graduate School Of Engineering Tohoku University
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Takahashi Masaki
AIST, Institute of Geology and Geoinformation, GSJ
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