A5068927038- Geological and Geochemical Analysis
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Landslides and related hazards
- Geological Studies and Exploration
- Geotechnical and Geomechanical Engineering
- Cryospheric studies and observations
- Hydrocarbon exploration and reservoir analysis
- Geological Formations and Processes Exploration
- Marine and environmental studies
- Rock Mechanics and Modeling
- Fault Detection and Control Systems
- Geological formations and processes
- Earthquake Detection and Analysis
- Radioactive element chemistry and processing
- Nuclear materials and radiation effects
- Mineral Processing and Grinding
- Geoscience and Mining Technology
- Advanced Condensed Matter Physics
- Mineralogy and Gemology Studies
- Geomechanics and Mining Engineering
- Planetary Science and Exploration
Japan Atomic Energy Agency
2015-2024
Tohoku University
2016-2017
Okayama Prefecture
2017
University of Niigata Prefecture
2017
Kyoto University
2006-2013
The University of Melbourne
2011
Kanazawa University
2010
National Research Institute for Earth Science and Disaster Resilience
2010
Abstract Zircon OD ‐3 from the P aleogene K awamoto G ranodiorite ( M ihara body) in J apan has been identified as a potential multi‐grain secondary standard for U–Pb dating. We have carried out an inter‐laboratory evaluation order to evaluate possible heterogeneity amongst zircon grains. ages were obtained using two analytical techniques (a sensitive high‐resolution ion microprobe and laser ablation–inductively coupled plasma–mass spectrometry) eight laboratories. All 238 U– 206 Pb show...
The influence of Quaternary climate (i.e., glacial-interglacial cycles) on mountain topography remains a topic debate, largely due to the challenges associated with measuring surface processes over recent geological past. A compelling location investigate erosion in response change is found Tateyama Mountains, part Hida range northern Japanese Alps, its distinct geomorphological features. Alps uplifted within last 1–3 million years and have undergone multiple glaciations during...
Electron spin resonance (ESR) dating of quartz minerals offers a significant advantage over luminescence because its later signal saturation. We seek to exploit this develop thermochronometry system capable resolving rock cooling rates throughout the Quaternary. Whereas is limited areas experiencing very rapid (exhumation) tens mm/yr, recent studies have shown that ESR can resolve
On January 1st, 2024, the Mw 7.5 Noto Peninsula earthquake ruptured on a series of coastal offshore reverse faults in back arc central Japan. Closest to rupture, northwest, rocks uplifted as much 4.4 m (Fukushima Yo et al., 2024). The coastline accordingly moved seaward by up 200 creating new wide bedrock platforms. Recent Holocene terraces mapped along northern coast (Shishikura 2020), where coseismic uplift was greatest 1st suggest similar past ruptures. Many follow at depth ca. 60 below...
Abstract. The electron spin resonance (ESR) of quartz has previously been shown to have potential for determining rock cooling histories; however, this technique remains underdeveloped. In study, we explore the ESR a suite samples from Hida range Japanese Alps. We develop measurement protocols and models constrain natural trapped-charge concentration as well parameters that govern signal growth thermal decay. stability Al Ti centres is similar luminescence feldspar. Inverting data yields...
Abstract Fission‐track (FT) and (U–Th–Sm)/He (He) analyses are used to constrain the denudation pattern history of Kiso Range, a Japanese fault‐block mountain range which has been uplifted since ca 0.8 Ma. We obtained nine zircon FT ages ranging 59.3–42.1 Ma, 18 apatite 81.9–2.3 13 He 36.7–2.2 The divided into an older group comparable age younger <18 interpreted as reflection uplift Range because they were only east Seinaiji‐touge Fault, event estimated from data is consistent with...
Zircons collected from a granitic pluton provide evidence of serial growth events with specific mechanisms, crystallization temperatures and U–Pb ages, revealing details the sequential formation process intrusion through emplacement to crystallization/solidification. The have been identified by: 1) study internal structure zircon using cathodoluminescence, 2) deriving Ti–in–zircon thermometry 3) age dating structure. magmatic zircons Toki granite, central Japan, show two kinds in their...
Low-temperature thermochronology is a widely used tool for revealing denudation histories of mountain ranges. Although this technique has been applied mainly to continental orogens, such as the European Alps, Himalayas, and Andes, recent technological development low-temperature made it applicable wider variety ranges with various sizes tectonic histories. The Japanese Islands comprise young active island arcs, where an early stage range formation observed. Numerous attempts have constrain...
The exhumation of bedrock is controlled by the interplay between tectonics, surface processes, and climate. highest rates centimeters per year are recorded in zones highly active tectonic convergence such as Southern Alps New Zealand or Himalayan syntaxes, where high rock uplift combine with very processes. Using a combination different thermochronometric systems including trapped-charge thermochronometry, we show that also occur Hida Mountain Range, Japanese Alps. Our results imply...
Abstract The C retaceous T oki granitic pluton of the ono district, central J apan was emplaced in E ast A sian continental margin at about 70 Ma. granite has apatite fission‐track ( AFT ) ages ranging from 52.1 ±2.8 Ma to 37.1 ±3.6 (number measurements, n = 33); this indicates three‐dimensional thermal evolution during pluton's low‐temperature history (temperature partial annealing zone: 60–120 °C). majority a spatial distribution older shallower parts and younger deeper parts, representing...
(U–Th)/He thermochronometric analyses were performed across the southern part of Northeast Japan Arc for reconstructing long-term uplift and denudation history in region. Apatite (U–Th–Sm)/He ages ranged from 64.3 to 1.5 Ma, while zircon between 39.6 11.0 Ma. showed obvious contrast among morphostructural provinces; older 64.3–49.6 Ma obtained Abukuma Mountains on fore-arc side, whereas younger 11.4–1.5 determined Ou Backbone Range (OBR) along volcanic front Asahi back-arc side. The age...
Abstract Fission track (FT), (U‐Th)/He (He), and U‐Pb data were used to identify the denudation history of Akaishi Range, central Japan. The northern Range is bounded on east by Itoigawa‐Shizuoka Tectonic Line Fault Zone (ISTL‐FZ). thermochronometric ages progressively decrease with decreasing distance ISTL‐FZ. Thermokinematic calculations suggest that age pattern observed can be explained 5–7.5 mm/yr reverse slip ISTL‐FZ dips 34–45° west soles onto detachment at 20–22.5 km depth. By...
In this study, multi-system thermochronology, i.e., fission-track (FT), K-Ar and U-Pb methods are used to identify the cooling denudation history of Tsuruga body Kojaku granite, southwest Japan. Apatite FT age 51.8 ± 6.5 Ma, zircon 70.4 2.0 biotite ages 66.7–62.0 68.5 0.7 Ma were obtained for granitic samples, whereas plagioclase 19.1–18.8 whole-rock 19.0 2.9 inferred basaltic dyke intruding into granite. The lengths not significantly shorter than their initial lengths, implying rapid at...
Quantitatively estimating denudation is generally difficult because it essentially involves the removal and loss of materials in situ. The rate mountainous areas Japan has commonly been studied from volume sediment a basin or catchment. Nonetheless, availability these methods constrained spatially by upstream area temporally depositional age. In last few decades, thermochronometric that evaluate thermal history using radiometric-dating have used to tectonic orogenic belts around world....
Abstract Topographic relief in arc-trench systems is thought to be formed by plate subduction; however, few quantitative investigations have so far been reported, with respect the related mountain building process. This study applies apatite and zircon (U–Th)/He thermochronometry (AHe, ZHe, respectively) Cretaceous granite rocks north part of northeast (NE) Japan Arc reveal its cooling/denudation history. Weighted mean AHe ages ranging from 88.6 0.9 Ma ZHe 83.9 7.4 were determined for 10...
Abstract Solidification pressures and ages of mafic microgranular enclaves (MMEs) their host granite were determined compared based on Al‐in‐hornblende geobarometry U–Pb zircon dating in two sample localities the Kurobegawa Granite. In KRG19‐A03 from middle unit pluton, MME yielded 0.18 ± 0.03 to 0.24 0.04 GPa 0.16 0.23 GPa, respectively. The KRG19‐B08b lower unit, respectively, 0.12 0.02 0.21 0.13 GPa. each locality, estimated solidification its overlap. weighted mean calculated as 0.775...
Abstract We performed fission track (FT) analyses to constrain the timing of fault slip events associated with plastic deformation biotite grains formed at high temperature, higher than 200–300°C. Apatite FT ages 49.6–16.7 Ma were obtained from Late Cretaceous granites near fault, younger a basaltic dike that intruded ~19 Ma. By comparing distribution apatite using forward thermal and annealing calculations, we interpreted as being explained by intrusion. concluded could have occurred...
We applied apatite fission-track (AFT) thermochronometry to the Cretaceous-Paleogene granitic rocks across southern part of Northeast (NE) Japan Arc in order elucidate denudation history. As results, AFT ages were estimated at 79.5–66.0 Ma on fore-arc side, 29.8–5.5 Ou Backbone range (OBR) and 19.1–4.6 back-arc side. Thermal inverse modeling with HeFTy offered high-resolution thermal histories, which converted into rates under assumption appropriate geothermal gradients. On stable slow...
Abstract To provide better access to thermochronological data and understand the long‐term denudation history of Japanese Islands, we compiled a low‐temperature dataset fission‐track (FT) (U–Th–Sm)/He (He) ages for apatite zircon in bedrocks. These thermochronometric are from 90 literature sources 1,096 localities, include 418 FT ages, 851 42 He 30 ages. Many have been reported previously; however, number is limited Islands. The spatially biased; instance, more Chubu Kinki districts Pacific...
The applicability of low-temperature thermochronology has been extended considerably over the past decade and successful application (U-Th)/He (He) thermochronometry is one most noteworthy advances. In this study, a zircon He analysis used to identify denudational history pattern Akaishi Range, which uplifted since late Pliocene. Zircon grain ages from nine samples range 21.5 3.0 Ma, while are systematically younger east. These interpreted reflect uplifting Range because youngest consistent...