Fluvial Terrace and Geomorphology in the Tokigawa (Shonaigawa) River Basin since the Middle Pleistocene

• Masayoshi TAJIKARA

  Association for the Development of Earthquake Prediction

• Ken'ichi YASUE

  Tono Geoscience Center, Japan Atomic Energy Agency

• Makoto YANAGIDA

  Hanshin Consultants Co., Ltd.

• Akira FURUSAWA

  FURUSAWA Geological Survey

• Norifumi TANAKA

  Palynosurvey Co., Ltd.

• Yoshimune MORITA

  Botanical Garden, Okayama University of Science

• Toshihiko SUGAI

  Graduate School of Frontier Science, University of Tokyo

Bibliographic Information

Other Title

• 土岐川（庄内川）流域の河成段丘と更新世中期以降の地形発達
• トキガワ ショウナイガワ リュウイキ ノ カセイ ダンキュウ ト コウシン セイ チュウキ イコウ ノ チケイ ハッタツ

Abstract

Many papers reported that Quaternary climate and sea-level fluctuations controlled riverbed elevation in the river basins in northeastern Japan. However, in the southern part of the Chubu region of Japan, such climatic-controlled riverbed fluctuations have not been reported, except in a few papers based on uncertain chronological data. In this research, we investigated fluvial terraces along the Tokigawa (Shonaigawa) River that flows through the low-relief mountainous areas in the northernmost part of the Mikawa Highlands, in the southern part of the Chubu region of Japan, and examined whether riverbed fluctuations similar to those in rivers in northeastern Japan occurred in the Tokigawa River basin. We mapped fluvial terraces based on air photo analysis and inferred the age and climate at the time of formation of these terraces based on ¹⁴C dating, tephra analysis, and pollen analysis. Fluvial terraces in the Tokigawa River basin were classified into 10 treads (H1–4 surfaces, M1–3 surfaces, L1–3 surfaces). We estimated that the L2 terrace was a depositional terrace formed during marine oxygen isotope stage (MIS) 2, based on ¹⁴C age, marker tephra (Kikai Akahoya tephra) in the soil layer covering terrace deposits, distribution pattern and morphology of terrace surfaces, and thickness of terrace deposits. The M2 terrace was correlated to MIS 6 based on the relationship between the marker tephra (Aso-4 tephra, Kikai Tozurahara tephra) and terrace deposits, existence of red weathered soil, and distribution pattern of the M2 terrace. Based on these results, we concluded that the fluvial terraces in the Tokigawa River basin were formed as a consequence of riverbed fluctuations linked to climate change. We estimated uplift rates in the Tokigawa River basin at 0.11–0.16 mm/year based on the elevation difference between M2 and L1 terrace surfaces.

Journal

• Geographical review of Japan series A

  Geographical review of Japan series A 84 (2), 118-130, 2011

  The Association of Japanese Geographers

Keywords

• fluvial terrace
• climatic terrace
• tephra
• climatic change
• uplift rate
• southern Chubu region

Details

• CRID: 1390001205300699008
• NII Article ID: 10028268110
• NII Book ID: AA11591990
• DOI: 10.4157/grj.84.118
• ISSN: 21851751
• ISSN: 18834388
• NDL BIB ID: 11043539
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11043539
• Web Site: https://www.jstage.jst.go.jp/article/grj/84/2/84_118/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed