Middle Pleistocene tephras erupted from the Iizuna Volcano in the Kabura-gawa river basin in the northern Kanto district, Japan

Tajikara, Masayoshi; Takada, Keita; Furusawa, Akira; Sugai, Toshihiko

doi:10.4116/jaqua.50.21

The Quat. Res.

2011

DOI: 10.4116/jaqua.50.21

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Middle Pleistocene tephras erupted from the Iizuna Volcano in the Kabura-gawa river basin in the northern Kanto district, Japan

Masayoshi Tajikara¹,

Keita Takada²,

Akira Furusawa³

et al.

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2013

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Cited by 1 publication

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Last 400 ka Landform Evolution of the Kanto Plain

Sugai¹,

Matsushima²,

Mizuno³

2013

J. Geogr.

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The Kanto Plain, the hinterland of the Tokyo metropolitan area, is the largest plain in Japan and is characterized by marked marine and fluvial terrace levels that developed during Marine oxygen Isotope Stage （MIS） 5. Late Quaternary topographical changes to the plain have been controlled by concurrent tectonic activity and glacio-eustatic sea-level changes. The shoreline at the maximum transgression of MIS 11, 9, 7, 5 and 1 is reconstructed based on the distribution of marine sediments revealed by many geologic columnar sections and marine terrace surfaces. A comparison of the magnitudes of the last five full-interglacial transgressions above shows that magnitude decreased over the long term. This is due probably to changes in the tectonic regime in the Kanto basin, from subsidence to uplift along with the northward migration of the depositional center, probably associated with changes in the motion of the Philippine Sea Plate and the collision with the Izu peninsula. The marine transgression has also been controlled by fluvial processes, especially in the north-western part of the plain because of high sediment inputs from the Tone, Ara, and Watarase rivers. Aggradation coupled with regional uplift since MIS 5.4 limited the MIS 1 marine transgression within the incised valley formed during MIS 2. As a result, the Paleo Tokyo bay, which was connected directly with the Pacific Ocean, disappeared. Instead, a large shallow submarine area of about 10,000 km 2 emerged. The northern part of the present Tokyo bay is still subsiding and large volumes of water and sediments have been concentrated in the bay area during the Holocene. Such natural environmental conditions enable supplies of natural resources, such as fresh water, fertile soil, and flat land for the development of greater Tokyo.

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Last 400 ka Landform Evolution of the Kanto Plain

Sugai¹,

Matsushima²,

Mizuno³

2013

J. Geogr.

Self Cite

View full text Add to dashboard Cite

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Middle Pleistocene tephras erupted from the Iizuna Volcano in the Kabura-gawa river basin in the northern Kanto district, Japan

Cited by 1 publication

References 22 publications

Last 400 ka Landform Evolution of the Kanto Plain

Last 400 ka Landform Evolution of the Kanto Plain

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