Microscopic observations of varve sediments from Lake Ni-no-Megata and Lake San-no-Megata, Oga Peninsula, NE Japan, with reference to the fallout age of the B-Tm Tephra

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  • Kamite Masaki
    Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University Present address: Nippon Steel Kankyo Engineering Co., Ltd.
  • Yamada Kazuyoshi
    Department of Geology, University of Turku Present address: Graduate School of Education, Naruto University of Education
  • Saito-Kato Megumi
    Department of Geology and Paleontology, National Museum of Nature and Science
  • Okuno Mitsuru
    Department of Earth System Science, Faculty of Science, Fukuoka University
  • Yasuda Yoshinori
    International Research Center for Japanese Studies

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Other Title
  • 男鹿半島，二ノ目潟・三ノ目潟湖底堆積物の年縞構造と白頭山－苫小牧火山灰（B-Tm）の降灰年代
  • オガ ハントウ ニ ノメガタ サン ノメガタ コテイ タイセキブツ ノ ネンコウ コウゾウ ト ハクトウサン トマコマイ カザンバイ B Tm ノ コウカイ ネンダイ
  • Microscopic observations of varve sediments from the Lake Ni-no-Megata and Lake San-no-Megata, Oga Peninsula, NE Japan, with reference to the fallout age of the B-Tm tephra

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This paper presents the results of microscopic observations of thin sections of sediment cores from Lakes Ni-no-Megata and San-no-Megata, Oga Peninsula, NE Japan. Micro-sedimentary structures indicate that cycles of light-dark lamina couplets represent biogenic varves, marking annual laminations. We identified 14 complete annual cycles and 1 partial annual cycle between the thin tephra layers of Towada-a (To-a) and Baitoushan-Tomakomai (B-Tm) in sediment cores from the two lakes, suggesting that B-Tm was deposited in AD 929. We also determined that To-a was deposited during early spring, while B-Tm was deposited during one or more eruption events during spring-summer.

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