邑知平野南部地区の平野下の第四紀層  [in Japanese] Quaternary Formation under the Southern Part of the Ohchi Plain, Noto Peninsula, Central Japan  [in Japanese]

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Abstract

邑知平野南部地区を横断する羽咋市宿屋-本江間で,標高-60m程度までボーリング調査を実施し,下位からVI層~I層の第四紀層を認定した.V層~I層は,火山灰分析および<sup>14</sup>C年代測定による堆積年代,堆積相から推定された堆積環境および花粉分析から推定された古気候によれば,酸素同位体ステージ6~5e以降の地層である.V~I層はそれぞれステージ6~5e,5d~5b,5b~5.0,4~2,2~1に対比できる.また,これらの地層について,古気候と堆積物の構成から,堆積当時の深度と現在の分布深度を比較し,眉丈山地や石動・宝達山地に対する邑知平野の相対的な沈降の時期について検討した.その結果,眉丈山地に対する邑知平野の相対的な沈降はV層堆積後,IV層堆積以前に終了している.一方,石動・宝達山地に対する邑知平野の相対的な沈降もIV層堆積開始以降認められない.

We conducted a boring investigation on the route of an electric power transmission line from Shukuya to Hongoh, Hakui City, in the southern part of the Ohchi Plain, Noto Peninsula, Ishikawa Prefecture, Central Japan. We found that the Quaternary formation consisted of several beds which we named bed VI-I in the upward direction. Beds V-I can be corresponded to oxygen isotopic stages 6-1 based on sedimentary facies, paleoclimate estimated from pollen analysis, tephrochronology, and radiocarbon dating. Beds V-I corresponded to MIS6-5e, 5d-5b, 5b-5.0, 4-2, and 2-1 respectively. We examined whether the relative subsidence of the Ohchi Plain against the Bijoh Mountains and the Sekidoh-Hohdatsu Mountains has continued without interruption during the time these beds were deposited. We concluded that the relative subsidence of the Ohchi Plain against the Bijoh Mountains may have been terminated between the time of bed V sedimentation and the time of bed IV sedimentation. Concerning the relative subsidence of the Ohchi Plain against the Sekidoh-Hohdatsu Mountains, no evidence of subsidence can be recognized since the time of bed IV sedimentation, at least in our data.

Journal

  • The Quaternary Research (Daiyonki-Kenkyu)

    The Quaternary Research (Daiyonki-Kenkyu) 41(3), 145-160, 2002-06-01

    Japan Association for Quaternary Research

References:  34

Cited by:  3

Codes

  • NII Article ID (NAID)
    10008631823
  • NII NACSIS-CAT ID (NCID)
    AN0034136X
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    04182642
  • NDL Article ID
    6178591
  • NDL Source Classification
    ZM49(科学技術--地球科学--地質)
  • NDL Call No.
    Z15-67
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
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