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Journal Articles

Depositional age constraint on channel sediments in an incised meandering river using feldspar OSL dating; A Case study in the Totsukawa River, Kii Mountains

Ogata, Manabu; Komatsu, Tetsuya; Nakanishi, Toshimichi

Dai Yonki Kenkyu, 60(2), p.27 - 41, 2021/06

https://doi.org/10.4116/jaqua.2007

no abstracts in English

Journal Articles

OSL signal resetting of modern fluvial sediments; A Verification of sediments along the Nishiki River

Tokuyasu, Kayoko; Tanaka, Kazuhiro*

Dai Yonki Kenkyu, 54(1), p.1 - 9, 2015/02

https://doi.org/10.4116/jaqua.54.1

Optically stimulated luminescence (OSL) signal resetting of quartz grains from modern fluvial sediments (flood and river-bed sediments; four samples in total) were investigated to discuss the applicability of OSL dating for fluvial terrace sediments in Japan. Single aliquot regenerative dose (SAR) protocol was employed to estimate the residual doses of the samples. Residual doses from all samples range from 1.20.3 to 5.93.5 Gy, and the doses can be converted to the OSL age of 6-0.6 ka. We concluded that the OSL dating has the potential to remark the marine isotope stage (MIS) of fluvial terraces at around 100 ka.

Journal Articles

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

Dai Yonki Kenkyu, 50(1), p.21 - 34, 2011/02

http://ci.nii.ac.jp/naid/10029070377

Three major fluvial terraces are developed well along the Kabura-gawa river, tributary of the Tone-gawa river. We detected cryptotephras in overbank and aeolian deposits covering the middle terrace gravels, and examined petrologic character. We also investigated petrologic character of the Iizuna-Kamitaru tephra (In-Kt) and the Iizuna-Nishiyama (In-Ny) tephra extracted from the outcrops near the Iizuna volcano. Based on these data, we identified possibly In-Kt and In-Ny tephra at the bottom of overbank deposits on the middle terrace of the Kabura-gawa river. This indicates that the middle terrace was formed through aggradation at glacial age of marine oxygen isotope stage 6. The Kabura-gawa river basin is located out of the previously reported distribution area of In-Kt. This fact implies that In-Kt is distributed more widely in the northern Kanto and southern Tohoku regions, and that In-Kt is useful as marker tephra of the middle Pleistocene in these regions.

Journal Articles

Re- $^{14}$ C dating of wood fossils from the gravel beds at Sebadani, the upper reaches of Azusa River, central Japan

Oikawa, Teruki*; Sasao, Eiji; Hoshino, Yasuharu*

Dai Yonki Kenkyu, 47(6), p.425 - 431, 2008/12

http://ci.nii.ac.jp/naid/10023995368

The depositional age of gravel beds at the Sebadani, in the upper reaches of Azusa River at the Hida Mountain Range has been determined by AMS $^{14}$ C dating. We measured the four new AMS $^{14}$ C dating of wood fossils in the gravel beds of Sebadani. The previous study estimated that the formation age of this gravel beds is 70,000-50,000 yr BP which corresponds to marine isotope stage (MIS) 4. However, the new obtained ages were . 48 ka BP from the wood fossils in the gravel beds.