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Sedimentary facies and depositional environment of CRE-TAT-1 and CRE-TAT-2 drilling core in Fuchu-city, Tokyo, central Japan

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doi: 10.4096/jssj.73.137
Authors:Funabiki, Ayako; Naya, Tomonori; Saito, Hirotaka; Takemura, Takato
Author Affiliations:Primary:
Nihon University, Tokyo, Japan
Other:
Geological Survey of Japan, Japan
Tokyo University of Agriculture and Engineering, Japan
Japan Science and Technology Agency, Japan
Volume Title:Taisekigaku Kenkyu Journal of the Sedimentological Society of Japan
Source:Taisekigaku Kenkyu = Journal of the Sedimentological Society of Japan, 73(2), p.137-152. Publisher: Taisekigaku Kenkyukai, Osaka, Japan. ISSN: 1342-310X
Publication Date:2015
Note:In Japanese with English summary. 30 refs.; illus., incl. geol. sketch map, strat. col.
Summary:The Pliocene to Middle Pleistocene Kazusa Group is widely distributed in subsurface of the Kanto Plain, central Japan. This study analyzed two drilling cores CRE-TAT-1 and CRE-TAT-2 obtained from the Fuchu city, Tokyo, where is located on the Tachikawa surface of Musashino uplands (terrace), the western part of Kanto Plain. The lithology and sedimentary structures of these cores were characterized in detail and grain-size distributions, water content, electrical conductivity and pH values in soil-stirred water were measured. Also, diatom assemblage analysis and X-ray fluorescence analysis were carried out. Both cores are divided into unit 1 to unit 7, in ascending order. Unit 1 is sandy channel and floodplain sediments. Unit 2, 4, and 6 are sandy gravels of river channels. Unit 3 consists of sand and silt with fresh-water diatom indicating floodplain environments. Unit 5 has sandy channel sediments at the bottom. The middle part of the unit 5 is bluish gray silt with abundant marine diatom. High sulfur content and electric conductivity suggest marine environment. It coarsens upward into the sandy channel and floodplain sediments showing upward shallowing trend. Unit 1 to 5 might correspond to the Toneri formation of the Kazusa Group deposited during 1.219-0.78 Ma. Unit 6 is terrace gravel which forms the Tachikawa surface during 0.4-0.2 Ma, and unit 7 is the Tachikawa Loam.
Subjects:Algae; Cenozoic; Cores; Depositional environment; Diatoms; Electrical conductivity; Facies; Floodplains; Fluvial features; Kazusa Group; Marine environment; Microfossils; Middle Pleistocene; Neogene; PH; Pleistocene; Pliocene; Quaternary; Regression; Sea-level changes; Sedimentary rocks; Spectra; Tertiary; Transgression; X-ray fluorescence spectra; Asia; Far East; Honshu; Japan; Kanto Plain; Tokyo Japan; Toneri Formation
Coordinates:N350000 N360000 E1404400 E1380000
Record ID:812648-3
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