兵庫県，播磨平野東部で発見された酸素同位体ステージ７．３の海進堆積物

DOI Web Site 被引用文献5件 参考文献34件

書誌事項

タイトル別名
  • Marine Transgression Equated with Oxygen Isotope Stage 7.3 in the Harima District, Hyogo Prefecture, Western Japan.
  • ヒョウゴケン ハリマ ヘイヤ トウブ デ ハッケン サレタ サンソ ドウイタイ ステージ 7.3 ノ カイシン タイセキブツ

この論文をさがす

抄録

Terrace sediments intercalating a marine clay layer were found in the Harima district along the northeastern coast of the Seto Inland Sea, Japan. We performed diatom and volcanic ash analyses to clarify the sedimentary environments and depositional age of the sediments. The sediments are divided into four lithostratigraphical units, I, II, III and IV in ascending order. The results of the diatom analysis suggest that unit I was deposited in freshwater conditions. Units II and III are inferred to have been deposited in marine littoral and brackish-water conditions, and unit IV in terrestrial conditions. The Kakogawa volcanic ash layer intercalated in unit III is correlative with the Koshienhama-I volcanic ash layer in the marine clay bed Mall (2) underlying the Osaka plain and the BT 51 volcanic ash layer (estimated eruption age 215ka) in the Takashima-oki 200m-core from Lake Biwa. Therefore, the marine facies of unitsII and III are stratigraphically equivalent to the Mall (2) bed, and the age of the transgression that deposited these marine units corresponds to oxygen isostope stage 7.3. From the succession of diatom assemblages, the former shoreline indicating the relative sea-level position at 215ka is recognized to be the Kakogawa volcanic ash horizon at about 44m above the present sea level. On the basis of this relative sea level and the paleo-sea level during stage 7 inferred from the coral-reef terraces in Sumba Island (Indonesia), average uplift rate during the last 215ka is estimated to be 0.2 to 0.3mm/yr at the investigated site.

収録刊行物

  • 第四紀研究

    第四紀研究 38 (5), 401-410, 1999

    日本第四紀学会

被引用文献 (5)*注記

もっと見る

参考文献 (34)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ