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Bartz, M.*; King, G. E.*; Bernard, M.*; Herman, F.*; Wen, X.*; 末岡 茂; 塚本 すみ子*; Braun, J.*; 田上 高広*
Earth and Planetary Science Letters, 644, p.118830_1 - 118830_11, 2024/10
被引用回数：4 パーセンタイル：53.20(Geochemistry & Geophysics)The impact of climate on mountain relief is unknown, mainly due to the difficulties of measuring surface processes at the timescale of glacial-interglacial cycles. An appropriate setting for studying mountain erosion in response to Quaternary climate change is found in the Tateyama mountains in the Hida mountain range (northern Japanese Alps) due to distinct geomorphological features of glacial, periglacial, and fluvial processes. The Japanese Alps uplifted within the past ca 1-3 Myr and experienced multiple glaciations during the late Quaternary. We use ultra-low temperature thermochronometers based on the luminescence of feldspar minerals and the electron spin resonance (ESR) of quartz minerals, in combination with inverse modelling to derive rock cooling rates and exhumation rate histories at 10
-10
year timescales from 19 rock samples from three transects in the Tateyama region. While luminescence signals have already reached their upper dating limit, ESR signals (Al and Ti centres) yielded ESR ages of ca 0.3-1.1 Ma, implying surface processes active in the Pleistocene. Based on a negative age-elevation relationship, local relief reduction at a cirque-basin scale is identified over the past 1 Myr, whereas a positive age distribution with elevation for samples close to the mountain top does not follow this trend. Inverse modelling reveals rock cooling rates on the order of 30-80 deg. C/Ma, with slightly faster cooling for cirque-floor samples, which equate with erosion rates of 0.5-1 mm/yr that exceed rates from periglacial and fluvial processes in the same locality. Thus, our data suggest that Quaternary climate change coupled with distinct surface processes modified the slopes of the Tateyama mountains leading to a localised decrease in relief over the second half of the Quaternary, whilst the mountain peaks were unaffected by the relief reduction.
Kim, S.*; Lee, B.*; Reeder, J. T.*; Seo, S. H.*; Lee, S.-U.*; Hourlier-Fargette, A.*; Shin, J.*; 関根 由莉奈; Jeong, H.*; Oh, Y. S.*; et al.
Proceedings of the National Academy of Sciences of the United States of America, 117(45), p.27906 - 27915, 2020/11
被引用回数：131 パーセンタイル：94.60(Multidisciplinary Sciences)本研究では、汗のコルチゾール分析のための流動イムノアッセイ、グルコースとアスコルビン酸(ビタミンC)分析のための蛍光測定イメージング、および電極を使用した発汗速度のデジタルトラッキングを組み合わせた、ワイヤレス,バッテリー不要の皮膚インターフェースマイクロ流体システムを実現した。運動している被験者を対象とした体系的なテストにより、本開発デバイスが物理的ストレスと生化学的相関を追跡可能であることが示された。
Kranz-Bartz, M.*; King, G. E.*; Bernard, M.*; Herman, F.*; Wen, X.*; 末岡 茂; 塚本 すみ子*; Braun, J.*; 田上 高広*
no journal, ,
The influence of Quaternary climate on mountain topography remains a topic of debate, largely due to the challenges associated with measuring surface processes over the recent geological past. A compelling location to investigate mountain erosion in response to Quaternary climate change is found in the Tateyama Mountains, part of the northern Japanese Alps, due to its distinct geomorphological features. The Japanese Alps uplifted within the last 1-3 million years and have undergone multiple glaciations during the late Quaternary. In this study, we employ novel ultra-low temperature thermochronometres based on the luminescence and electron spin resonance (ESR) from feldspar and quartz, respectively, in combination with inverse modelling to derive rock cooling and exhumation rate histories on timescales of 10-10 years within the Tateyama region. The four luminescence signals have already reached their upper dating limit, indicating maximum exhumation rates of ca. 1-1.5 mm/yr. In contrast, ESR signals from Al and Ti centres provided ESR ages ranging ca. 0.3-1.1 Ma, suggesting that surface processes were active during the Pleistocene. A negative age-elevation relationship reveals a reduction in local relief at the scale of the cirque basin over the past million years. However, a positive age-elevation trend observed in samples from near the mountain summit deviates from this pattern. Inverse modelling shows rock cooling rates ranging 20-80
C/Myr, with slightly faster cooling in cirque-floor samples. Thermal kinematic modelling reveals erosion rates of 0.5-1 mm/yr in the cirque basin, which are higher than those observed from periglacial and slope processes in the same area. Our data suggest that Quaternary climate change, coupled with distinct surface processes, has significantly altered the slopes of the Tateyama mountains, leading to a localized decrease in relief within individual cirque basins during the second half of the Quaternary.
