Late Quaternary Landform Development of the Kanto Plain

Sugai, Toshihiko; Matsushima, Hiroko; Ishihara, Takeshi

doi:10.1007/978-981-10-7638-1_1

Cited by 1 publication

(2 citation statements)

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“…Clayey silt is present from a depth of 16 to 20 m; it could be described as transitional sediment after confirming its physicochemical data from Figure 3 and with reference [30]. Marine sediment is distributed from 20 to 27 m. sediment thickness was confirmed from the EC value, S content, the presence of marine shell fragments, and correlation with other references [30,32,43,44]. Marine sediment is separated from nonmarine sediment by 3 m of transitional sediment ( Figure 2).…”

Section: Lithologic Reconstructionsupporting

confidence: 72%

“…A lithological column was performed after correlating with the relevant references of nearby areas and collecting physicochemical data of the sediment samples, e.g., visual observations of the color, particle size distribution, electrical conductivity, and S content ( Figure 2). The lithostratigraphic reconstruction and landform evolution in the Kanto Plain have been studied by different parties [29,32,[42][43][44], and research there is ongoing. For this research, the sediments of different depositional environments were identified and described, along with the chemical characteristics.…”

Section: Lithologic Reconstructionmentioning

confidence: 99%

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Leaching Behavior of As, Pb, Ni, Fe, and Mn from Subsurface Marine and Nonmarine Depositional Environment in Central Kanto Plain, Japan

et al. 2019

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The leaching behavior of arsenic (As), lead (Pb), nickel (Ni), iron (Fe), and manganese (Mn) was investigated from subsurface core sediment of marine and nonmarine depositional environments in central Kanto Plain, Japan. A four-step sequential extraction technique was adopted to determine the chemical speciation, potential mobility, and bioavailability of metals under natural conditions in variable depositional environments. In addition, a correlation of these properties with pore water and total metal content was carried out. The concentration of As in pore water was found to be 2–3 times higher than the permissible limit (10 µg/L) for drinking water and leachate in fluvial, transitional, and marine environments. The trend of potential mobile fractions of As, Pb, and Ni showed Fe–Mn oxide bound > carbonate bound > ion exchangeable bound > water soluble in the fluvial environment. However, in the marine environment, it showed Fe–Mn oxide bound > water soluble > carbonate bound > ion exchangeable bound for As. The leaching of As in this fluvial environment is due to the organic matter-mediated, reductive dissolution of Fe–Mn oxide bound, where Mn is the scavenger. The amount of total content of As and sulfur (S) in transitional sediment reflects an elevated level of leachate in pore water, which is controlled by S reduction. However, the leaching of As in marine sediment is controlled by pH and organic matter content.

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