房総半島の第四紀　　地層・地形から読む海水準変動とテクトニクス　　房総半島の地形から読む中・後期更新世の海水準とテクトニクス

• 菊地 隆男

  東京都立大学大学院理学研究科地理科学専攻

書誌事項

タイトル別名

• Sea Level Changes and Tectonics Inferred from the Quaternary Deposits and Landforms of Boso Peninsula, Central Japan. Some Notes on Middle to Late Pleistocene Topographic History Inferred from the Landforms of Boso Peninsula, Kanto District, Japan.
• ボウソウ ハントウ ノ チケイ カラ ヨム チュウ コウキ コウシン セイ ノ カイスイジュン ト テクトニクス

抄録

A couple of themes relating to the Middle to Late Pleistocene topographic history of Boso Peninsula are discussed based on landform observations. Remarkable Quaternary upheaval in the Peninsula has made marine terraces emerge above the present sea level during δ¹⁸O stage 3. A flight of terraces recording past sea levels was found in the Taibusa-misaki area: six Pleistocene marine terraces, 80, 74, 62, 56, 44, and 24m asl., are recognized, though all except the highest one are very narrow. On the basis of the age of some tephras overlying terraces, the general uplift rate was estimated, and high stands of sea level at stage 3 were calculated to be -28 to -33m asl. These levels completely agree with the sea levels estimated from the terraces in the lower reach of Isumi river (Kuwabara et al., 1999) and also with the earlier data from Huon Peninsula (Chappell and Shackleton, 1986).<br>The Quaternary history of the topographic development of the Peninsula was sketched based on the drainage pattern of the valleys, which shows a characteristic gradual uplift from the deep sea throughout the Quaternary Period. These valley systems record the original gradient of the emerged shoal for their primitive channel pattern. The valley toward the north suggests that the north wing of the Hayama-Mineoka uplift zone had been tilting up to the early Middle Pleistocene and formed a peninsula jutting out toward the east. After that, the Kashima-Boso uplift zone ranging northeast and southwest had been growing more remarkable, and northwestward flowing rivers spread on the surface of the land during the late Middle Pleistocene. In the Late Pleistocene, the extended rivers shifted to the west and flew into a lagoon which had originated from tectonic collapse and developed into the present Tokyo Bay.

収録刊行物

• 第四紀研究

  第四紀研究 40 (3), 267-274, 2001

  日本第四紀学会

キーワード

• 房総半島
• 後期更新世
• 酸素同位体ステージ3
• 古海水準
• 地形発達史
• 鹿島-房総隆起帯

詳細情報

• CRID: 1390001206496993280
• NII論文ID: 10007431112
• NII書誌ID: AN0034136X
• DOI: 10.4116/jaqua.40.267
• ISSN: 18818129
• ISSN: 04182642
• NDL書誌ID: 5798105
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I5798105
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可