A5054126598- Geological and Geochemical Analysis
- Astro and Planetary Science
- earthquake and tectonic studies
- Isotope Analysis in Ecology
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Nuclear Physics and Applications
- Geochemistry and Geologic Mapping
- Radioactive element chemistry and processing
- Planetary Science and Exploration
- Paleontology and Stratigraphy of Fossils
- Astronomical and nuclear sciences
- Mineralogy and Gemology Studies
- Geochemistry and Elemental Analysis
- Archaeology and ancient environmental studies
- Methane Hydrates and Related Phenomena
- Spacecraft and Cryogenic Technologies
- Geological and Tectonic Studies in Latin America
- Pleistocene-Era Hominins and Archaeology
- Space Exploration and Technology
- Classical Antiquity Studies
- Advanced Chemical Physics Studies
- Metabolism and Genetic Disorders
- Field-Flow Fractionation Techniques
- Archaeology and Historical Studies
Japan Atomic Energy Agency
2016-2024
University of Leeds
2023
The Graduate University for Advanced Studies, SOKENDAI
2012-2021
Lunar and Planetary Institute
2016
Universities Space Research Association
2013-2016
National Museum of Nature and Science
2016
Nippon Soken (Japan)
2012
Kobe University
2010
Understanding the crustal evolutionary dynamics of island arc-trench systems requires a thorough evaluation magma chamber processes, and especially shallow granitic intrusion emplacement processes. To address this, we studied petrography geochronology Kuki granite, Kitakami Mountains, northeast Japan, as an example non-adakitic granite at magmatic flare-up stage. Analysis paired crystallization temperatures pressures hornblende grains reveals temperature–pressure (i.e., depth) history magma....
The Harachiyama Formation comprises Lower Cretaceous volcanic rocks, which are distributed in the eastern margin of Kitakami Mountains northeastern Japan. Whole-rock chemical analysis, U–Pb zircon dating and Hf isotope analysis were performed to constrain formation age magmatic origin was discussed. lava tuff samples from Omoto Tsukue areas supported island-arc rhyolitic rocks (SiO2 content > 70%), yielded weighted mean ages 127.8 ± 3.4 Ma 129.2 2.6 (2σ), respectively. Eighteen grains two...
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...
Uncertainty for elemental and isotopic measurements in calcite by LA‐ICP‐MS is largely controlled the homogeneity of reference materials (RMs) used calibration validation. In order to produce RMs with homogeneous compositions, we incorporated elements including U, Pb rare earth into through heat‐ pressure‐induced crystallisation from amorphous calcium carbonate that was precipitated element‐doped reagent solution. X‐ray absorption spectra showed U present as U(VI) synthesised calcite,...
The absolute date of the Millennium Eruption (ME) Changbaishan Volcano is widely recognized as AD 946. Baegdusan-Tomakomai (B-Tm) tephra dispersed during ME a robust-age key bed. In order to identify tephra, refractive index and major-element compositions volcanic glass shards are conventionally used. Meanwhile, trace-element analysis using inductively coupled plasma mass spectrometry (ICP-MS) technique for bulk samples B-Tm still limited. Here we give detailed description major- sediments...
1662年寛文日向灘地震による宮崎平野の津波堆積物の特徴を把握するため，日本原子力研究開発機構 東濃地科学センターのレーザーアブレーション付き誘導結合プラズマ質量分析装置（LA-ICPMS）を用いて津波堆積物中の砕屑性ジルコンのU–Pb年代測定を実施した。本研究では，試料の化学的前処理手法としてchemical abrasion法を適用させ，U–Pb年代測定に必要な粒子径約50 μm以上のジルコン粒子25点を回収した。LA-ICPMS測定の結果，津波堆積物中の砕屑性ジルコンのU–Pb年代の範囲は約14 Maから約2405 Maであり，特に100 Maと2000 Ma付近の年代値を示すジルコン粒子が多く見られた。今後，測定実績をさらに蓄積していくことが重要であるが，本研究で得られた100 Ma付近の年代値を示す津波堆積物中のジルコン粒子は白亜紀から古第三紀に相当する四万十層群に由来する可能性が考えられる。また，1662年寛文日向灘地震による津波堆積物中の砕屑性ジルコンのU–Pb年代の分布は，九州中央部の前弧砂岩から得られている結果と類似していることが示された。
Abstract Solidification pressure and crystallization age of the ~5 Ma Shiaidani Granodiorite (Hida Mountain Range, central Japan) are determined based on Al‐in‐hornblende geobarometry U–Pb zircon dating. Al‐poor patchy replacements developed in amphiboles common this granite petrographic study revealed that include chloritized biotite albitic plagioclase. These probably hydrothermally recrystallized domains, should not be used for solidification estimates. Magmatic rim amphibole is...
Abstract We have conducted petrological and mineralogical studies on an igneous clast in the Northwest Africa (NWA) 1685 (LL4) chondrite. This meteorite was described Meteoritical Bulletin as containing clasts similar to alkali‐rich LL chondritic breccias Yamato (Y)‐74442 (LL4), Bhola (LL3‐6), Krähenberg (LL5). carefully compared textures, well mineral matrix compositions, of NWA with those previously breccias. Olivine grains are embedded glassy no chemical zoning. Shock melt veins fractures...
Abstract We performed zircon U–Pb dating on the Pliocene Tanigawa-dake granites (Makihata and Tanigawa bodies) Cretaceous Minakami quartzdiorite, Northeast Japan Arc. Concordia ages were estimated to be 3.95 ± 0.11 Ma (± 2 sigma) for Makihata body, 3.18 0.13 3.32 0.15 109.4 2.2 quartzdiorite. The quartzdiorite is possibly correlated bedrock in Ashio belt because age of consistent with earliest Tadamigawa (107–62 Ma) which are distributed northeast region belong belt. All older than...