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- W2312662461 abstract "新潟県中央部の阿賀町津川，加茂市七谷地域および魚沼市守門の上部中新統において，広域的に対比できる可能性のあるテフラ層を見出した．津川地域の野村層に挟まるOtbtテフラ層，七谷地域の南五百川層に挟在するDtbtテフラ層，そして守門地域の貫木層中のIsbtテフラ層は，記載岩石学的特徴や火山ガラスの化学組成から対比される．これらのテフラ層はいずれも白色のガラス質のテフラ層で，火山ガラスの主成分化学組成において，MgOが0.00－0.01 wt.％，CaOが0.22－0.46 wt.％と極めて低い値を示すことを特徴とする．これらのテフラ層は，いずれも珪藻化石帯のNPD 5D帯最下部の生層準D56とD57の間の狭い年代範囲の中に落ち，その年代は9.9 Maと算定される．" @default.
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- W2312662461 date "2009-01-01" @default.
- W2312662461 modified "2023-10-18" @default.
- W2312662461 title "Correlation of late Miocene tephra beds in the central area of Niigata Prefecture, northeast Japan" @default.
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- W2312662461 doi "https://doi.org/10.5575/geosoc.115.177" @default.
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