3:30 PM - 3:45 PM
[HQR06-01] Estimation of incision and uplift rate based on feldspar OSL dating of river channel sediments: case study in the Oi River
★Invited Papers
Keywords:feldspar, luminescence, OSL, pIRIR, fluvial sediment
Terrace to terrace (TT) method (Yoshiyama and Yanagida, 1995) is mainly used for estimating uplift rate on mountain areas of Japan on 105-year time scale. However, this method cannot be applied to the area with poor distribution of fluvial terraces. In such area, the method based on the emergence ages of the fluvial landform, e.g., an abandoned river valley around a cutoff spur, and the relative elevation between old and present reiver bed is expected instead of TT method (Yasue et al., 2014; Ogata et al., 2021). This method calculates the river-incision rate by dividing the relative elevation by the emergence age. The river-incision rate is equal to the uplift rate if the river is at equilibrium (graded stream).
The uplift and denudation rates of the Akaishi Range is extremely fast nationwide, with maximum of 2-4 mm/yr in about 70 years determined by geodetic methods (Dambara, 1971) and maximum of ~4 mm/yr after about 3 Ma estimated by thermochronological methods (Sueoka et al., 2017). However, climatic terraces are poorly distributed in Oi River basin and estimating uplift rate is difficult using by TT method. While, abandoned river valleys around a cutoff spur exist in large number and thus the method based on the emergence age of fluvial landform and the relative elevation is considered to be applicable.
We are investigating the fluvial landform, such as abandoned river valleys around a cutoff spur and fluvial terrace, in the Oi River basin for estimating the incision and uplift rate and verifying its regional representativeness (Ogata et al., 2022; Tsukahara et al., 2022). The emergence ages were estimated by applying feldspar OSL dating, which can be applied to geomorphological time scale (105-year), to river channel sediments. In this presentation, we will present the incision and uplift rate estimated by feldspar OSL dating results.
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting programs (Grant number: JPJ007597), “Establishment of Advanced Technology for Evaluating the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (Fiscal Years 2020-2022)” and “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (Fiscal Years 2023)”.
References: Yoshiyama and Yanagida (1995) Journal of Geography, 104, 809-826. Yasue et al. (2014) Jour. Geol. Soc. Japan, 120, 435-445. Ogata et al. (2021) The Quaternary Research, 60, 27-41. Dambara (1971) Journal of the geodetic society of Japan, 17, 100-108. Sueoka et al. (2017) JGR Solid Earth, 122, 6787-6810. Ogata et al. (2022) JpGU2022, SCG42-P07. Tsukahara et al. (2022) 2022JAQUA, P-04.
The uplift and denudation rates of the Akaishi Range is extremely fast nationwide, with maximum of 2-4 mm/yr in about 70 years determined by geodetic methods (Dambara, 1971) and maximum of ~4 mm/yr after about 3 Ma estimated by thermochronological methods (Sueoka et al., 2017). However, climatic terraces are poorly distributed in Oi River basin and estimating uplift rate is difficult using by TT method. While, abandoned river valleys around a cutoff spur exist in large number and thus the method based on the emergence age of fluvial landform and the relative elevation is considered to be applicable.
We are investigating the fluvial landform, such as abandoned river valleys around a cutoff spur and fluvial terrace, in the Oi River basin for estimating the incision and uplift rate and verifying its regional representativeness (Ogata et al., 2022; Tsukahara et al., 2022). The emergence ages were estimated by applying feldspar OSL dating, which can be applied to geomorphological time scale (105-year), to river channel sediments. In this presentation, we will present the incision and uplift rate estimated by feldspar OSL dating results.
This study was funded by the Ministry of Economy, Trade and Industry, Japan as part of its R&D supporting programs (Grant number: JPJ007597), “Establishment of Advanced Technology for Evaluating the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (Fiscal Years 2020-2022)” and “Establishment of Technology for Comprehensive Evaluation of the Long-term Geosphere Stability on Geological Disposal Project of Radioactive Waste (Fiscal Years 2023)”.
References: Yoshiyama and Yanagida (1995) Journal of Geography, 104, 809-826. Yasue et al. (2014) Jour. Geol. Soc. Japan, 120, 435-445. Ogata et al. (2021) The Quaternary Research, 60, 27-41. Dambara (1971) Journal of the geodetic society of Japan, 17, 100-108. Sueoka et al. (2017) JGR Solid Earth, 122, 6787-6810. Ogata et al. (2022) JpGU2022, SCG42-P07. Tsukahara et al. (2022) 2022JAQUA, P-04.