Chemical composition of the green rocks in the Nedamo Terrane, Northeast Japan

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  • Uchino Takayuki
    Department of Natural History Sciences, Graduate School of Science, Hokkaido University Present address: Geological Survey of Japan, AIST
  • Kawamura Makoto
    Department of Natural History Sciences, Graduate School of Science, Hokkaido University

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  • 根田茂帯緑色岩の化学組成
  • ネダモタイ リョクショクガン ノ カガク ソセイ

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The Nedamo Complex, an Early Carboniferous accretionary complex, contains green rocks of Late Devonian age. The complex consists of two lithotectonic units: the Takinosawa Unit and Tsunatori Unit. We analyzed the chemical composition of the green rocks in both units, as this has yet to be done for the Takinosawa Unit, and has only been done for some of the green rocks of the Tsunatori Unit. The chemical composition of green rocks in the Takinosawa Unit shows features of phyric within-plate tholeiite ; that in the Tsunatori Unit shows features of phyric alkali basalt, phyric within-plate tholeiite, and aphyric MORB.

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