関東ローム層中に含まれる微細石英の堆積速度の約１０万年間の変化　北関東喜連川丘陵早乙女の例

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タイトル別名
  • Fluctuation of Fine Quartz Accumulation Rate of the "Kanto loam" Indicating Northwest Winter Monsoon Intensity since the Last Interglacial Age.
  • カントウ ロームソウチュウ ニ フクマレル ビサイ セキエイ ノ タイセキ ソ
  • 北関東喜連川丘陵早乙女の例

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The presence of silt-sized quartz in andesitic or basaltic wethered volcanic ash soils has indicated the additions of non-volcanogenic material through soil accumulation. The oxygen isotope composition of the quartz revealed that it originated from tropospheric dust transported from inland China by the northwest winter monsoon. Thus, the fluctuation of the quartz accumulation rate indicates the fluctuation of northwest winter monsoon intensity. Series of the quartz accumulation rate since the Last Interglacial age, obtained at the Saotome section in the north-Kanto Plain, demonstrate the fluctuation simultaneous with the standard marine oxygen isotope variation. The quartz accumulation rate increases in oxygen isotope stages 2, 4 and 5b, indicating cold climate episodes, and decreases in stages 1, 3 and 5a, indicating warm climate episodes. This fluctuation suggests a strengthening of the northwest winter monsoon during cold stages and weakening during warm stages, a finding that agrees well with variations of quartz accumulation rate in the Tokachi Plain and with variations of the grain size distribution and the accumulation rate of loess-paleosol sequence in the Chinese Loess Plateau.

収録刊行物

  • 第四紀研究

    第四紀研究 35 (2), 87-98, 1996

    日本第四紀学会

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