Middle Miocene dolerite sheets in the Semi-Mogami area,Yamagata Prefecture

DOI

Bibliographic Information

Other Title
  • 山形県瀬見・最上地域の中期中新世ドレライト岩床群

Description

Dolerite sills were intruded in the Semi-Mogami area,Yamagata prefecture in the Middle Miocene time.There are primitive dolerite in Mogami and differentiated dolerite in Semi.Pyroxene of Mogami dolerite has high in Mg#(core 72-86,rim 62-76) and is Ca-rich.Their spinel has high Cr#(58-78) and low ferric iron. Pyroxene of Semi dolerite has low Mg#(∼68) and is Ca-poor with pigeonite.The pyroxene rim of Mogami and pyroxene core of Semi resemble each other in composition.The Semi and Mogami dolerites may have been derived from the same magma.Picritic basalt of the Yoka Formation in Kyoto prefecture resembles the Mogami dolerite in Mg#,Ca,Ti of pyroxene and Cr# of spinel.The Cr-rich and low-ferric iron spinel means the origin of the magma high degree partial melting of the mantle.

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Details 詳細情報について

  • CRID
    1390282680521666944
  • NII Article ID
    130004601653
  • DOI
    10.14824/jakoka.2010.0.244.0
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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