Grain-size distribution of the postglacial deposits in the Kujukuri Plain, Chiba Prefecture, central Japan

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  • KOMATSUBARA Junko
    AIST, Geological Survey of Japan, Research institute of Geology and Geoinformation

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  • 九十九里平野における沖積層の粒度組成
  • クジュウクリ ヘイヤ ニ オケル チュウセキソウ ノ リュウド ソセイ

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<p>Postglacial deposits in four boring cores obtained from the Kujukuri Plain, central Japan, in 2015 were studied with grain size analysis. The results are discussed in terms of sedimentary facies. The majority of transgressive incised-valley deposits consists of mud and coarsens upward to lower shoreface deposits of very fine to fine, well-sorted sand. The proportion of medium, coarse and very coarse sand increases in upper shoreface deposits. The foreshore, backshore and dune deposits consist mainly of very fine and fine sand. The predominance of well-sorted sandy deposits is attributed to the supply of sand reworked from sandy and semi-consolidated Pleistocene nearby.</p>

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