Otake Tsubasa
| Faculty of Engineering Sustainable Resources Engineering Resources Engineering | Professor |
Last Updated :2025/07/05
■Researcher basic information
Researchmap personal page
Researcher number
- 80544105
J-Global ID
Research Keyword
Research Field
Educational Organization
- Bachelor's degree program, School of Engineering
- Master's degree program, Graduate School of Engineering
- Doctoral (PhD) degree program, Graduate School of Engineering
■Career
Career
- Feb. 2023 - Present
Hokkaido University, Division of Sustainable Resources Engineering, Faculty of Engineering, Professor, Japan - Apr. 2012 - Jan. 2023
Hokkaido University, Division of Sustainable Resources Engineering, Faculty of Engineering, Associate Professor - Oct. 2011 - Mar. 2012
National Institute of Advanced Industrial Science and Technology, Research Institute for Geo-resources and Environment, Postdoctoral researcher - Feb. 2009 - Sep. 2011
Graduate School of Science, Tohoku University, Division of Earth and Planetary Material Science, Department of Earth Science,, Assistant Professor
Educational Background
- Sep. 2003 - Dec. 2008, The Pennsylvania State University, Department of Geosciences
- Apr. 2002 - Aug. 2003, Kyushu University, Graduate School of Engineering, Department of Earth Resources Engineering
- Apr. 1998 - Mar. 2002, Kyushu University, School of Engineering, Department of Earth Resources, Marine and Civil Engineering, Japan
Committee Memberships
- Jul. 2023 - Present
日本原子力研究開発機構, ニアフィールド長期環境変遷評価技術開発委員会 委員, Others - Apr. 2022 - Present
北海道新幹線、新函館北斗・札幌間 自然由来重金属等掘削土対策検討委員会, 幹事会幹事, Others - Apr. 2022 - Present
北海道新幹線、新函館北斗・札幌間 自然由来重金属等掘削土対策検討委員会, 委員会委員, Others - Jul. 2020 - Present
北海道特定開発行為審査委員会 委員, Autonomy - Apr. 2020 - Present
独立行政法人石油天然ガス・金属鉱物資源機構, 業務評価委員会 金属鉱物資源開発・公害防止等専門部会委員, Others - Apr. 2020 - Present
Geochemical Society of Japan, ｢Geochemical Journal｣ Editorial board member, Society - Apr. 2016 - Present
資源地質学会, ｢資源地質｣ 編集委員, Society - Apr. 2016 - Present
資源地質学会, ｢Resource Geology｣ 編集委員, Society - Jul. 2015 - Present
資源・素材学会, 会報誌委員, Society - Apr. 2013 - Present
The mining and Materials Processing Institute of Japan, ｢Journal of MMIJ｣ Editorial board member, Society - Apr. 2022 - Mar. 2025
資源地質学会, 評議委員, Society - Apr. 2022 - Mar. 2024
資源地質学会, 常務委員（行事）, Society - Feb. 2020 - Jun. 2023
原子力発電環境整備機構, 「高温条件を考慮したベントナイトの諸特性に関する検討」専門委員, Others - Apr. 2019 - Mar. 2023
電力中央研究所, ｢緩衝材中における微生物共存下金属腐食試験｣専門家委員, Others - Jul. 2014 - Mar. 2023
ジオテクノス株式会社, 選鉱・製錬個別研究会 検討委員, Others - May 2021 - Jul. 2022
Goldschmidt 2022, Theme Chair for theme 8, Energy and Resources in Service of Society, Society - Apr. 2021 - Mar. 2022
資源地質学会, 常置委員会副委員（行事）, Society - Apr. 2021 - Mar. 2022
資源地質学会, 常務委員（研究教育推進）, Society - Apr. 2018 - Mar. 2021
資源地質学会, 評議委員, Society - Apr. 2014 - Mar. 2017
資源地質学会, 評議委員, Society
■Research activity information
Awards
- Jun. 2022, The Society of Resource Geology, Best Article Award 2021
Geochemical constraints on the mobilization of Ni and critical metals in laterite deposits, Sulawesi, Indonesia: A mass-balance approach
Ito, A;Otake, T;Maulana, A;Sanematsu, K;Sufriadin;Sato, T, 11763384 - 2017, The Clay Science Society of Japan, Best article award in the Clay Science Society of Japan
Quantitative analysis for dissolution of silica minerals in the compacted bentonite at hyperalkaline conditions by X−ray computed tomography and geochemical modeling
R. Nakabayashi;T. Kijima;Y. Tsukada;T. Sato;T. Otake;K. Kaneko;T. Yoneda - 2011, International Society for the Study of the Origin of Life, Best Poster award, Origins 2011 International Conference
Tsubasa Otake - 2008, Astrobiology Science Conference 2008, Frank Drake Award
Tsubasa Otake
Papers
- Immobilisation of iodide in alkali-activated materials
Raudhatul Islam Chaerun, Manami Ishimura, Pramesti Prihutami, Xiaobo Niu, Yusuke Ohya, Kazuma Kuroda, Kanako Toda, Ryosuke Kikuchi, Tsubasa Otake, John L. Provis, Yogarajah Elakneswaran, Tsutomu Sato
Chemosphere, 369, 143871, 143871, Elsevier BV, Dec. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Primary Fe isotope signatures record oxidative precipitation in 3.2 Ga ferruginous siliciclastic sedimentary rocks deposited in a shallow ocean environment
Ryohei Suzumeji, Tsubasa Otake, Daizo Yamauchi, Yoko Ohtomo, Takeshi Kakegawa, Christoph Heubeck, Shin ichi Yamasaki, Tsutomu Sato
Precambrian Research, 413, 107574, Oct. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 46553825 - Atmospheric hydrochloric and nitric acid leaching of a limonite ore from the Wolo mine area, Southeast Sulawesi, Indonesia
Sufriadin, Malyanus YEPTA, Irzal NUR, Purwanto, Rizky AMALIA, Ulva Ria IRFAN, Djabal Nur BASIR, Tsubasa OTAKE
Journal of Metals, Materials and Minerals, 34, 1, 1875, 1875, Metallurgy and Materials Science Research Institute, Chulalongkorn University, 19 Mar. 2024, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, The atmospheric acid leaching studies of a limonite ore sample from the Wolo mine area, Southeast Sulawesi, Indonesia, have been performed using hydrochloric acid (HCl) and nitric acid (HNO3). The objectives of these studies were to compare the leaching degree of metals (Ni, Co, Fe, and Al) and to analyze the dissolution behavior of minerals under different acid concentrations. Mineralogical characterization of the ore sample was conducted using optical microscopy, scanning electron microscopy (SEM), and X-ray diffraction, whereas chemical composition was determined by X-ray fluorescence (XRF) spectrometry and atomic absorption spectroscopy (AAS), respectively. An atmospheric leaching test was done with the variables of acid concentration, leaching duration of 90 min, and leaching temperature of 100℃. Limonite ore samples contain goethite, gibbsite, talc, quartz, and lizardite. It was revealed that as much as 92.22% of Ni and 90.14% of Fe could be leached using 3 M HCl, whereas only 63.14% of Ni and 38.74% of Fe could be extracted from limonite ore using 3 M HNO3. The higher leaching degree of Fe in HCl indicates low selectivity with Ni, which might contaminate pregnant leach solution (PLS), leading to further complications in the purification process. Results of the leaching experiment show that goethite was more easily dissolved in HCl than in HNO3. - Immobilization Forms of Cadmium and Mercury in a Potassium-Activated Metakaolin-Based Geopolymer
Pramesti Prihutami, Raudhatul Islam Chaerun, Yusuke Ohya, Tsubasa Otake, Ryosuke Kikuchi, Tsutomu Sato
Minerals, 14, 3, 311, 311, 15 Mar. 2024, [Peer-reviewed], [International Magazine]
English, Scientific journal, Previous studies of cadmium and mercury immobilization in geopolymers have produced inconsistent results due to their different pozzolans, metal concentrations, and mixing procedures. Understanding the effects of these parameters on heavy metal immobilization is key to predicting their long-term stability. In this study, cadmium and mercury were incorporated into a metakaolin-based K-activated geopolymer by three mixing procedures and concentrations of 0.02–1.00 wt.%. The samples were then immersed in water for 90 d to determine their stability. The results show that mercury is readily leached from the geopolymer, but cadmium is retained. Adding the heavy metals in salt form converts the metals into cadmium hydroxide and mercury oxide that reside at the bottom of the geopolymer. Mixing the salts with water forms soluble heavy metals prior to geopolymerization. This procedure produces more-homogeneous geopolymers. Cadmium is associated with silicate and aluminate, giving a better stability, whereas mercury forms mercury oxide. Different cadmium and mercury concentrations do not change the metal speciation as mercury is affected by relativistic contribution. - The formation of schwertmannite colloids and natural remediation of toxic elements from Shojin River, Hokkaido, Japan
Frances Chikanda, Sereyroith Tum, Tatsuya Matsui, Susumu Norota, Tsubasa Otake, Tsutomu Sato
Resource Geology, 73, 1, Wiley, Jun. 2023, [Peer-reviewed], [International Magazine]
English, Scientific journal, 27289727 - Formation of magnesium silicate hydrate (M-S-H) at pH 10 and 50°C in open-flow systems
Yuto Nishiki, Jordi Cama, Tsubasa Otake, Ryosuke Kikuchi, Misato Shimbashi, Tsutomu Sato
Applied Geochemistry, 148, 105544, 105544, Elsevier BV, Jan. 2023, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Difference in expansion and dehydration behaviors between NH4- and K-montmorillonite
Ryohei Kawakita, Akito Saito, Hiroshi Sakuma, Sohtaro Anraku, Ryosuke Kikuchi, Tsubasa Otake, Tsutomu Sato
Applied Clay Science, 231, 106722, 106722, Elsevier BV, Jan. 2023, [Peer-reviewed], [International Magazine]
English, Scientific journal - Retention mechanism of cesium in chabazite embedded into metakaolin-based alkali activated materials
Raudhatul Islam Chaerun, Natatsawas Soonthornwiphat, Kanako Toda, Kazuma Kuroda, Xiaobo Niu, Ryosuke Kikuchi, Tsubasa Otake, Yogarajah Elakneswaran, John L. Provis, Tsutomu Sato
Journal of Hazardous Materials, 440, 129732, 129732, Elsevier BV, Oct. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Effects of lignosulfonate on synthesis products of the pozzolanic reaction
Kanako Toda, Daisuke Minato, Takumi Saito, Ryosuke Kikuchi, Tsubasa Otake, Tsutomu Sato
Cement, 9, 100042, 100042, Elsevier BV, Sep. 2022, [Peer-reviewed], [International Magazine]
English, Scientific journal - Low-Temperature Hydrothermal Synthesis of Chromian Spinel from Fe-Cr Hydroxides Using a Flow-Through Reactor
Yoko Ohtomo, Jeehyun Yang, Miu Nishikata, Daisuke Kawamoto, Yuki Kimura, Tsubasa Otake, Tsutomu Sato
Minerals, 12, 9, 1110, 1110, MDPI AG, 30 Aug. 2022, [Peer-reviewed], [International Magazine]
English, Scientific journal, Recent studies have suggested that a chromian spinel can be formed under natural hydrothermal conditions; however, the required conditions, process, and associated redistribution of Cr are still poorly understood. Here, chromian spinel formation was performed by Fe-Cr hydroxides alteration with an Fe2+(aq) supply at 150, 170, and 200 °C and 5 MPa simulating the diagenetic process. The flow-through system enabled the Fe2+(aq) supply to be leached from the magnetite by an acidic solution to synthesize Fe-Cr hydroxides as the starting material with two reaction cells, flow lines, heaters, and a high-performance liquid chromatography (HPLC) pump. The accuracy of the temperature measurement was confirmed based on the amorphous silica solubility. Mineralogical analysis of solid samples recovered from the reaction cell indicated that the chromian spinel was formed between 150 and 170 °C from Fe-Cr hydroxides through goethite with a simultaneous hematite formation, while Mössbauer spectra showed that a large quantity of Fe-Cr ferrihydrites still remained after the experiments probably because of the Cr addition to the stability of ferrihydrites. The Cr/Fe ratio of the chromian spinel was smaller than that of the bulk of the Fe-Cr ferrihydrites and equivalent to Cr-rich magnetite, suggesting a redistribution of Cr during the transformation from goethite to synthesized spinel under the hydrothermal conditions., 10843041 - Characteristics and Formation Pathways of Iron- and Magnesium-Silicate-Hydrates and Smectites Under Natural Alkaline Conditions
Misato Shimbashi, Shingo Yokoyama, Ryosuke Kikuchi, Tsubasa Otake, Tsutomu Sato
Clays and Clay Minerals, Springer Science and Business Media LLC, 23 Aug. 2022, [Peer-reviewed], [International Magazine]
English, Scientific journal - Water quality in the Lisungwi and Kaphamtengo Rivers in Manondo, Central Malawi: Assessment of the impact of artisanal small scale gold mining
Frances Chikanda, Tsubasa Otake, Jones Mwatseteza, Tsutomu Sato
Malawi Journal of Science and Technology, 14, 1, 29, 43, Jul. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 27289727 - Seasonal effects of natural attenuation on drainage contamination from artisanal gold mining, Cambodia: Implication for passive treatment
Sereyroith Tum, Kanako Toda, Tatsuya Matsui, Ryosuke Kikuchi, Sitha Kong, Panha Meas, Unsovath Ear, Yoko Ohtomo, Tsubasa Otake, Tsutomu Sato
Science of The Total Environment, 806, 150398, 150398, Elsevier BV, Feb. 2022, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Mineralogical evolution of a weathering profile in the Tagaung Taung Ni laterite deposit: significance of smectite in the formation of high-grade Ni ore in Myanmar
Ayaka Murofushi, Tsubasa Otake, Kenzo Sanematsu, Kyaw Zay Ya, Akane Ito, Ryosuke Kikuchi, Tsutomu Sato
Mineralium Deposita, 57, 1107, 1122, Springer Science and Business Media LLC, 12 Jan. 2022, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 27289727 - Formation of various types of iron ore deposits by concentration of iron in the Earth's surface environments
Tsubasa Otake, Yoko Ohtomo
Resource Geology (in Japanese), 71, 2, 57, 73, Dec. 2021, [Peer-reviewed], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Scientific journal, 27289727 - Geochemical constraints on the mobilization of Ni and critical metals in laterite deposits, Sulawesi, Indonesia: A mass‐balance approach
Akane Ito, Tsubasa Otake, Adi Maulana, Kenzo Sanematsu, Sufriadin, Tsutomu Sato
Resource Geology, 71, 3, 255, 282, Wiley, Jul. 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 27289727 - The Latowu Ultramafic Rock-Hosted Iron Mineralization in the Southeastern Arm Sulawesi, Indonesia: Characteristics, Origin, and Implication for Beneficiation
Sufriadin, Sri Widodo, Meinarni Thamrin, Akane Ito, Tsubasa Otake
International Journal on Advanced Science Engineering and Information Technology, 11, 3, 987, 993, Jun. 2021, [Peer-reviewed], [Last author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - The formation of Fe colloids and layered double hydroxides as sequestration agents in the natural remediation of mine drainage
Frances Chikanda, Tsubasa Otake, Aoi Koide, Akane Ito, Tsutomu Sato
Science of The Total Environment, 774, 145183, 145183, Jun. 2021, [Peer-reviewed], [International Magazine]
English, Scientific journal, 11763384 - Geochemical behaviour of heavy metals in sludge effluents and solid deposits on the Zambian Copperbelt: Implication for effluent treatment and sludge reuse
Cryton Phiri, Daiki Shimazui, Tsubasa Otake, Ryosuke Kikuchi, Isaac Chintu, Meki Chirwa, Lawrence Kalaba, Imasiku Nyambe, Tsutomu Sato
Science of The Total Environment, 769, 144342, 144342, Elsevier BV, May 2021, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Subseafloor sulphide deposit formed by pumice replacement mineralisation
Tatsuo Nozaki, Toshiro Nagase, Yutaro Takaya, Toru Yamasaki, Tsubasa Otake, Kotaro Yonezu, Kei Ikehata, Shuhei Totsuka, Kazuya Kitada, Yoshinori Sanada, Yasuhiro Yamada, Jun-ichiro Ishibashi, Hidenori Kumagai, Lena Maeda, the D, Chikyu Expeditio, Scientists
Scientific Reports, 11, 1, 8809, Springer Science and Business Media LLC, Apr. 2021, [Peer-reviewed], [International Magazine]
English, Scientific journal,Abstract Seafloor massive sulphide (SMS) deposits, modern analogues of volcanogenic massive sulphide (VMS) deposits on land, represent future resources of base and precious metals. Studies of VMS deposits have proposed two emplacement mechanisms for SMS deposits: exhalative deposition on the seafloor and mineral and void space replacement beneath the seafloor. The details of the latter mechanism are poorly characterised in detail, despite its potentially significant role in global metal cycling throughout Earth’s history, because in-situ studies require costly drilling campaigns to sample SMS deposits. Here, we interpret petrographic, geochemical and geophysical data from drill holes in a modern SMS deposit and demonstrate that it formed via subseafloor replacement of pumice. Samples from the sulphide body and overlying sediment at the Hakurei Site, Izena Hole, middle Okinawa Trough indicate that sulphides initially formed as aggregates of framboidal pyrite and matured into colloform and euhedral pyrite, which were replaced by chalcopyrite, sphalerite and galena. The initial framboidal pyrite is closely associated with altered material derived from pumice, and alternating layers of pumiceous and hemipelagic sediments functioned as a factory of sulphide mineralisation. We infer that anhydrite-rich layers within the hemipelagic sediment forced hydrothermal fluids to flow laterally, controlling precipitation of a sulphide body extending hundreds of meters., 11549321 - Large Fe isotope fractionations in sulfide ores and ferruginous sedimentary rocks from the Kuroko volcanogenic massive sulfide deposits in the Hokuroku district, northeast Japan
Tsubasa Otake, Ryoichi Yamada, Ryohei Suzuki, Shunsuke Nakamura, Akane Ito, Ki-Cheol Shin, Tsutomu Sato
Geochimica et Cosmochimica Acta, 295, 49, 64, Feb. 2021, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal, 27289727 - Chromium occurrence in a nickel laterite profile and its implications to surrounding surface waters
Ruth Esther Delina, Carlo Arcilla, Tsubasa Otake, Jhonard John Garcia, Mark Tan, Akane Ito
Chemical Geology, 558, 119863, 119863, Elsevier BV, Dec. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Effect of Soil Organic Matters in Dredged Soils to Utilization of their Mixtures Made with a Steel Slag
Kanako Toda, Ryosuke Kikuchi, Tsubasa Otake, Satoshi Nishimura, Yuzoh Akashi, Michihiro Aimoto, Takeshi Kokado, Tsutomu Sato
Materials, 13, 23, 5450, 5450, MDPI AG, 30 Nov. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal, Dredged soils have been used as construction materials by alkaline activation with steel slag (steel slag-dredged soil mixtures) at harbors. Such mixtures develop strength chiefly by calcium silicate hydrate (C-S-H) formation by the pozzolanic reaction. However, the strength of such mixtures is unpredictable, and in some cases, mixtures have been too soft for the intended engineering application. An identification of strength development indicators would accelerate evaluation processes for strength development to facilitate and promote the utilization of such materials. This paper focuses on the relationship between the characteristics of soil organic matters in dredged soils and the strength development of the mixtures by a comparison of eight dredged soils collected from eight different Japanese harbors. The characteristics of the soil organic matters were identified to determine as indicators of mixtures with weak strength development, i.e., enriched sulfur content in extracted soil organic matter (humic acid) fraction, and the N/C ratio of humic acid similar to land humic acid standards. Increases in the validated fraction of dredged soils and steel slag by replacing fractions disadvantageous to construction resources would contribute to reduce waste production, which would lower the environmental impact of the use, aiming to achieve sustainable utilization of such materials. - Formation of Natural Silicate Hydrates by the Interaction of Alkaline Seepage and Sediments Derived from Serpentinized Ultramafic Rocks at Narra, Palawan, the Philippines
Misato Shimbashi, Shingo Yokoyama, Yasutaka Watanabe, Tsutomu Sato, Tsubasa Otake, Ryosuke Kikuchi, Minoru Yamakawa, Naoki Fujii
Minerals, 10, 8, 719, 719, MDPI AG, 17 Aug. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal, In radioactive waste disposal facilities, low-permeability engineered barrier materials are important for inhibiting radionuclide migration. However, dissolution–precipitation reactions under alkaline conditions change the permeability of engineered barriers. To understand long-term dissolution–precipitation reactions under alkaline conditions in chemically complex systems, trenches and drill holes were excavated at Narra in Palawan, where alkaline fluids (pH > 11) have been naturally produced, seeping into clastic sediments derived from serpentinized ultramafic rocks and gabbro of Palawan ophiolite. Interaction between the alkaline seepage and clastic sediments, which have been deposited since 15,000 radiocarbon years before present (14C yr BP), led to dissolution of minerals and the precipitation of Si-bearing phases which were divided into two main categories: Fe-Mg-Si infillings and Ca-Si infillings. The former category was composed of iron-magnesium-silicate-hydrate (F-M-S-H) and a nontronite-like mineral and was widely recognized in the clastic sediments. The nontronite-like mineral likely formed by interaction between silicates and alkaline seepage mixed with infiltrated seawater, whereas F-M-S-H formed by the reaction of silicates with alkaline seepage in the absence of seawater infiltration. Ca-Si infillings included 14 Å tobermorite and were precipitated from alkaline seepage combined with the Ca and Si supplied by the dissolution of calcite and silicates in the clastic sediments. - Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer
Natatsawas Soonthornwiphat, Yutaro Kobayashi, Kanako Toda, Kazuma Kuroda, Chaerun Raudhatul Islam, Tsubasa Otake, Yogarajah Elakneswaran, John L. Provis, Tsutomu Sato
Journal of Nuclear Science and Technology, 57, 10, 1, 8, Informa UK Limited, 05 Jun. 2020, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Precipitation of magnesium silicate hydrate in natural alkaline surface environments
Y. Nishiki, T. Sato, T. Katoh, T. Otake, R. Kikuchi
Clay Science, 24, 1, 1, 13, Jun. 2020, [Peer-reviewed], [International Magazine]
English, Scientific journal - Geochemical characteristics of ores and surface waters for environmental risk assessment in the Pinpet iron deposit, southern Shan State, Myanmar
K. Zay Ya, T. Otake, A. Koide, K. Sanematsu, T. Sato
Resource Geology, 70, 296, 308, Feb. 2020, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal, 11763384 - Magmatic-hydrothermal processes associated with Rare Earth Element enrichment in the Kangankunde carbonatite complex, Malawi
F. Chikanda, T. Otake, Y. Ohtomo, A. Ito, T. D. Yokoyama, T. Sato
Minerals, 9, 7, 442, 442, MDPI AG, Jul. 2019, [Peer-reviewed], [International Magazine]
English, Scientific journal, Carbonatites undergo various magmatic-hydrothermal processes during their evolution that are important for the enrichment of rare earth elements (REE). This geochemical, petrographic, and multi-isotope study on the Kangankunde carbonatite, the largest light REE resource in the Chilwa Alkaline Province in Malawi, clarifies the critical stages of REE mineralization in this deposit. The δ56Fe values of most of the carbonatite lies within the magmatic field despite variations in the proportions of monazite, ankerite, and ferroan dolomite. Exsolution of a hydrothermal fluid from the carbonatite melts is evident based on the higher δ56Fe of the fenites, as well as the textural and compositional zoning in monazite. Field and petrographic observations, combined with geochemical data (REE patterns, and Fe, C, and O isotopes), suggest that the key stage of REE mineralization in the Kangankunde carbonatite was the late magmatic stage with an influence of carbothermal fluids i.e. magmatic–hydrothermal stage, when large (~200 µm), well-developed monazite crystals grew. The C and O isotope compositions of the carbonatite suggest a post-magmatic alteration by hydrothermal fluids, probably after the main REE mineralization stage, as the alteration occurs throughout the carbonatite but particularly in the dark carbonatites. - Correction: Toda, k., et al. Key factors affecting strength development of steel slag-dredged soil mixtures. (Minerals (2018), 8(5), 174)
Kanako Toda, Haruna Sato, Nilan Weerakoon, Tsubasa Otake, Satoshi Nishimura, Tsutomu Sato
Minerals, 8, 10, MDPI AG, 22 Oct. 2018
English, Scientific journal - Geochemical study of ultramafic rocks from Latowu area of North Kolaka, Southeast Sulawesi and its implication for CO2 sequestration
Sufriadin, S. Widodo, A. Ito, T. Otake, K. Sanematsu
Journal of Degraded and Mining Lands Management, 5, 4, 1403, 1408, International Research Centre for the Management of Degraded and Mining Lands, Jul. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Key factors affecting strength development of steel slag-dredged soil mixtures
Kanako Toda, Haruna Sato, Nilan Weerakoon, Tsubasa Otake, Satoshi Nishimura, Tsutomu Sato
Minerals, 8, 5, 174, MDPI AG, 01 May 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal - Formation of Fe-and Mg-rich smectite under hyperalkaline conditions at narra in Palawan, the Philippines
Misato Shimbashi, Tsutomu Sato, Minoru Yamakawa, Naoki Fujii, Tsubasa Otake
Minerals, 8, 4, 155, MDPI AG, 01 Apr. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal - Dissolved silica effects on adsorption and Co-precipitation of Sb(III) and Sb(V) with ferrihydrite
Shuang Zhou, Tsutomu Sato, Tsubasa Otake
Minerals, 8, 3, 101, MDPI AG, 05 Mar. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal - Mechanisms of Se(IV) co-precipitation with ferrihydrite at acidic and alkaline conditions, and its behavior during aging
P. C. M. Francisco, T. Sato, T. Otake, T. Kasama, S. Suzuki, H. Shiwaku, T. Yaita
Environmental Science and Technology, 52, 4817, 4826, Mar. 2018, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Effect of dissolved silica on immobilization of boron by magnesium oxide
Shoko Nozawa, Tsutomu Sato, Tsubasa Otake
Minerals, 8, 2, 76, MDPI AG, 24 Feb. 2018, [Peer-reviewed], [International Magazine]
English, Scientific journal - Geochemical signatures and processes in a stream contaminated by heavy mineral processing near Ipoh city, Malaysia
Akane Ito, Tsubasa Otake, Ki-Cheol Shin, Kamar Shah Ariffin, Fei-Yee Yeoh, Tsutomu Sato
APPLIED GEOCHEMISTRY, 82, 89, 101, Jul. 2017, [Peer-reviewed], [Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Microstructural properties of hardened cement paste blended with coal fly ash, sugar mill lime sludge and rice hull ash
Einstine M. Opiso, Tsutomu Sato, Tsubasa Otake
Advances in Concrete Construction, 5, 3, 289, 301, Techno Press, 01 Jun. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Effects of Glycine, Water, Ammonia, and Ammonium Bicarbonate on the Oligomerization of Methionine
Rui Huang, Yoshihiro Furukawa, Tsubasa Otake, Takeshi Kakegawa
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES, 47, 2, 145, 160, Jun. 2017, [Peer-reviewed], [International Magazine]
English, Scientific journal - A novel method for remediation of nickel containing wastewater at neutral conditions
Haruko Hase, Toru Nishiuchi, Tsutomu Sato, Tsubasa Otake, Tsuyoshi Yaita, Tohru Kobayashi, Tetsuro Yoneda
JOURNAL OF HAZARDOUS MATERIALS, 329, 49, 56, May 2017, [Peer-reviewed], [International Magazine]
English, Scientific journal - 5-year chemico-physical evolution of concrete-claystone interfaces, Mont Terri rock laboratory (Switzerland)
Urs Mader, Andreas Jenni, Catherine Lerouge, Stephane Gaboreau, Satoru Miyoshi, Yukinobu Kimura, Veerle Cloet, Masaaki Fukaya, Francis Claret, Tsubasa Otake, Masahito Shibata, Babara Lothenbach
SWISS JOURNAL OF GEOSCIENCES, 110, 1, 307, 327, Apr. 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Microscopic observations of chromian spinel synthesized in a low temperature hydrothermal environment
Nishikata Miu, Ohtomo Yoko, Otake Tsubasa, Kimura Yuki, Kawamoto Daisuke, Sato Tsutomu
Abstracts of Annual Meeting of the Geochemical Society of Japan, 64, 310, 310, GEOCHEMICAL SOCIETY OF JAPAN, 2017
Japanese, - Adsorption and Post Adsorption Behavior of Schwertmannite with Various Oxyanions
K. Khamphila, R. Kodama, T. Sato, T. Otake
Journal of Minerals and Materials Characterization and Engineering, 5, 90, 106, 2017, [Peer-reviewed], [International Magazine]
English, Scientific journal - Cerium removal by activated carbon derived from palm kernel shell
C.-H. Ooi, A. Ito, T. Otake, F.-Y. Yeoh
Advanced Materials Letters, 8, 2, 145, 149, 2017, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Kinetics of Fe3+ mineral crystallization from ferrihydrite in the presence of Si at alkaline conditions and implications for nuclear waste disposal
Paul Clarence M. Francisco, Tsutomu Sato, Tsubasa Otake, Takeshi Kasama
AMERICAN MINERALOGIST, 101, 9-10, 2057, 2069, Sep. 2016, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Effect of octahedrally coordinated aluminum ions on the uptake of Au(III) chloro-hydroxy complexes in Al-Si systems
Tsubasa Otake, Takushi Yokoyama, Paul C. M. Francisco, Koichiro Watanabe
GEOCHEMICAL JOURNAL, 49, 4, 343, 350, 2015, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal - Spatial distributions of chromium enrichment in ~3.2 Ga Banded Iron Formations, Barberton Greenstone Belt, South Africa
ISHIKAWA KO, OTAKE TSUBASA, KAWAI SHOHJI, SATO TSUTOMU, KAKEGAWA TAKESHI
Abstracts of Annual Meeting of the Geochemical Society of Japan, 61, 127, 127, GEOCHEMICAL SOCIETY OF JAPAN, 2014
Japanese, 地球表層の酸化は酸素発生型光合成細菌の出現が原因であると考えられているが、その進化時期と初期地球表層環境の変遷については明らかになっていない。主に先カンブリア時代に産出する縞状鉄鉱層の微量元素や同位体組成は、形成当時の海洋溶存成分を反映していると考えられ、初期地球表層環境の推定に用いられてきた。本研究の目的は，南アフリカ・バーバトン地域において主に浅海性堆積岩から構成されるムーディーズ層群中の約32億年前に形成した縞状鉄鉱層中で発見されたクロム濃集の空間的広がりを明らかにすることである。そのため、バーバトンから南西に10kmほどに位置する、先行研究においてクロム濃集がみられたMoodise Hills (MH)および北東に10kmほどに位置するEureka synclineにあるGate of Paradise (GP)において調査を行った。 - Transition in depositional environments after the formation of Kuroko deposits indicated from rare earth element patterns and iron isotopes
Otake Tsubasa, Suzuki Ryohei, Yamada Ryoichi, Shin Ki-Cheol, Kon Yoshiaki, Sato Tsutomu
Abstracts of Annual Meeting of the Geochemical Society of Japan, 61, 8, 8, GEOCHEMICAL SOCIETY OF JAPAN, 2014
Japanese, 本研究では，黒鉱鉱床のような大規模塊状硫化物鉱床の形成要因と当時の海洋環境の関係性をレアアースパターンと鉄安定同位体比を用いて調べた。黒鉱形成後に堆積した鉄に富む化学堆積岩には、レアアースパターンがCeの負異常を示し，また大きな鉄の同位体分別を示すものが存在することから，当時の海洋は酸化還元環境に関して成層化していたと考えられる。このことは，大規模塊状硫化物鉱床の形成において還元的な海洋環境が重要な要因の一つであることを示唆している。 - Mineral Synthesis in Si-Al-Ca Systems and Their Iodide Sorption Capacity under Alkaline Conditions
Xiaoji Liu, Atsushi Asai, Tsutomu Sato, Einstine Opiso, Tsubasa Otake, Tetsuro Yoneda
WATER AIR AND SOIL POLLUTION, 224, 3, 1442, Mar. 2013, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Quantitative Analysis for Dissolution of Silica Minerals in the Compacted Bentonite at Hyperalkaline Conditions by X-ray Computed Tomography and Geochemical Modeling
R. Nakabayashi, T. Kijima, Y. Tsukada, T. Sato, T. Otake, K. Kaneko, T. Yoneda
Journal of the Clay Science Society of Japan (in Japanese), 52, 1, 9, 22, The Clay Science Society of Japan, 2013, [Peer-reviewed], [Domestic magazines]
Japanese, Scientific journal, Dissolution rates of montmorillonite in bentonite under hyperalkaline conditions have been obtained to evaluate the long-term performance of engineered barriers for radioactive waste disposal. The saturation state of pore water with respect to montmorillonite in bentonite has been demonstrated as an important factor controlling montmorillonite dissolution rate. Pore water chemistry including the saturation state may be significantly affected by the dissolution of accessory minerals in bentonite. The bentonite "Kunigel V1", which is being considered for use in radioactive disposal barriers in Japan, actually contains a large amount (〜50 %) of accessory silica minerals, such as chalcedony and quartz. Dissolution of the silica minerals may inhibit the dissolution of montmorillonite in the bentonite by increasing the silica concentration and hence the saturation state with respect to montmorillonite in the pore water. Therefore, the objectives of this study are to examine the dissolution kinetics of the silica minerals and the effect of dissolved silica on the dissolution of montmorillonite in a compacted bentonite using X-ray computed tomography (CT) and geochemical modeling. Advective alteration experiments of a compacted bentonite (Kunigel V1) with a dry density of 0.3 Mg/m^3 was conducted with 0.3M NaOH solution at 70℃ for 360 days. X-ray CT images, which were taken every 10 days, showed that the volume of a light colored material decreased as the interaction between the bentonite and hyperalkaline-fluid progressed during the experiments. This is attributed to the dissolution of accessory silica minerals in the bentonite. XRD analyses of altered bentonite after the experiments identified that the accessory mineral was mainly chalcedony. The kinetic data for dissolution of chalcedony was obtained by developing the methodology to quantify the volume of accessory minerals in the CT images. These results showed that chalcedony was almost completely dissolved in the area close to the fluid input within 80 days. The geochemical transport model consistent with the experimental results indicates that the pore water in the bentonite became near saturation with respect to montmorillonite due to the dissolution of silica minerals in bentonite, inhibiting the dissolution of montmorillonite in bentonite. The model also indicates that the inhibition of montmorillonite dissolution will not be sustained beyond the experimental duration under the same experimental conditions. However, a compacted bentonite with higher dry density such as 1.6 Mg/m^3, where diffusion is the dominant mass transport mechanism, has been considered for use in actual radioactive disposal barriers in Japan. In the much more compacted bentonite system, dissolution of montmorillonite will be inhibited for a much longer term. Therefore, it is important to consider the dissolution behavior of silica minerals to sufficiently evaluate the long-term performance of bentonite as a component of engineered barriers for radioactive waste disposal. - Abiotic Formation of Valine Peptides Under Conditions of High Temperature and High Pressure
Yoshihiro Furukawa, Tsubasa Otake, Takato Ishiguro, Hiromoto Nakazawa, Takeshi Kakegawa
ORIGINS OF LIFE AND EVOLUTION OF BIOSPHERES, 42, 6, 519, 531, Dec. 2012, [Peer-reviewed], [International Magazine]
English, Scientific journal - Field excursion at Kuroko-type VMS deposit in the Hokuroku district, Akita Prefecture
Hasegawa, M, Yamada, R, Otake, T, Nozaki, T
Shigen-Chishitsu, 62, 3, 249, 257, The Society of Resource Geology, 2012, [Invited], [Domestic magazines]
Japanese, Scientific journal - Stability of Amino Acids and Their Oligomerization Under High-Pressure Conditions: Implications for Prebiotic Chemistry
Tsubasa Otake, Takashi Taniguchi, Yoshihiro Furukawa, Fumio Kawamura, Hiromoto Nakazawa, Takeshi Kakegawa
ASTROBIOLOGY, 11, 8, 799, 813, Oct. 2011, [Peer-reviewed], [Lead author, Corresponding author], [International Magazine]
English, Scientific journal - Using multiple sulfur isotopes to understand the Earth’s surface environments during the Archean era.
Otake, T, Wanatabe, Y
Chikyukagaku (Geochemistry), 45, 4, 251, 264, The Geochemical Society of Japan, 2011, [Peer-reviewed], [Invited], [Lead author, Corresponding author], [Domestic magazines]
Japanese, Scientific journal, Since the discovery of Anomalous Isotope Fractionation (AIF) of sulfur, or more commonly termed Mass-Independent Fractionation (MIF) of sulfur, in many sedimentary rocks older than 2.45Ga, and its virtual absence in younger rocks, the AIF record has been cited by many researchers as unequivocal evidence for a dramatic change from an anoxic to oxic atmosphere around 2.45Ga. However, multiple sulfur isotope data from these natural samples have been interpreted based on the assumption that sulfur chemistry in gas phase is only responsible for AIF of sulfur in nature. The objective of this review is to evaluate this assumption. First, results of ab initio calculations for equilibrium isotope exchange between S-bearing species show that deviations from the mass-dependent relationships during equilibrium processes are much smaller than those found in Archean sedimentary rocks. Consequently, AIF requires a property that is a discontinuous function of mass (e.g., nuclear volume, magnetic moment, asymmetry of molecules, isotopic abundance). The number of bound states may be another discontinuous function of mass, which fractionates S isotopes anomalously during chemisorption at a high temperature (e.g., >100℃). A recent experimental study also showed that thermochemical sulfate reduction by simple amino acids produces AIF of sulfur. These results suggest that an alternative process, such as reactions between organic matter in sediments and sulfate-rich hydrothermal solutions, may have caused AIF signatures of sulfur in Archean sedimentary rocks. - Effects of pressure on the oligomerization of valine
Furukawa Yoshihiro, Otake Tsubasa, Nakazawa Hiromoto, Kakegawa Takeshi
Abstracts of Annual Meeting of the Geochemical Society of Japan, 58, 55, 55, GEOCHEMICAL SOCIETY OF JAPAN, 2011
初期地球におけるアミノ酸の重合反応は、生命誕生に至る重要な一段階と考えられている。これまでの研究の多くは、初期地球のアミノ酸の重合反応は干潟や海底熱水噴出孔付近で起こるという提案に基づき、研究が行われてきた。これらの環境を模擬した実験ではアミノ酸の重合が確認されているが、その重合度は低く、さらに、これらの環境では場合によってアミノ酸の光化学分解または熱分解が卓越することが問題視されている。近年、このような問題に対して、アミノ酸の重合が初期地球の海洋堆積物内の高温高圧低含水率環境で起こるという提案がなされ、研究が行われている。本研究はこのような仮説に基づき、特に、アミノ酸重合反応に対する圧力の影響を明らかにする。海洋堆積物内の高温高圧低含水率環境を模擬し、アミノ酸の重合反応を研究するため、アミノ酸（バリン）を金カプセルに封入し、高温高圧環境（150-200°C、50-150 MPa）で長時間反応させた（0-192時間）。回収試料中のペプチドは液体クロマトグラフィー質量分析（LC/MS）を用いて、残存アミノ酸と副生成物は液体クロマトグラフィー（HPLC; OPA誘導体化）を用いて分析を行った。実験試料から検出されたペプチドは2-6量体の直鎖ペプチドと環状2量体であった。この他に、バリンの分解に伴ってグリシン、β-アラニン、アンモニア、メチルアミン、エチルアミンも検出された。バリンの分解率は反応時間、反応温度とおともに上昇した。一定の温度(200°C)、24時間反応条件では、バリンの残存率は高く(~80%)、圧力に影響されない、また、バリンペプチドの収率は圧力とともに減少することが明らかになった。一方、一定の温度(200°C)、192時間反応条件では、バリンの残存率は低く(0.2–2%)、バリン残存率およびバリンペプチド収率は圧力とともに上昇することが明らかになった。副生成物であるグリシン、β-アラニン、アンモニア、メチルアミン、エチルアミンの生成はバリンの分解反応が脱ガス反応であることを示唆している。このことは、バリンの分解率が高い反応時間において圧力がバリンの分解を抑制したことと整合的である。このことから、圧力が脱ガス反応を抑制し、バリンとバリンペプチドの安定性を向上させたことによりバリンペプチドを生成する脱水重合反応（非脱ガス反応）、が促進され高収率のペプチド生成に至ったと考えられる。これらの結果は、初期地球の海洋堆積物深部環境において、脱水反応を促進する低含水率だけでなく、圧力もペプチド生成に貢献することを示唆する。また、これらの結果はグリシンやアラニンの先行研究とも整合的である。 - Stability of amino acids and their oligomerization under high temperature and high pressure conditions
Otake Tsubasa, Taniguchi Takashi, Furukawa Yoshihiro, Nakazawa Hiromoto, Kakegawa Takeshi
Abstracts of Annual Meeting of the Geochemical Society of Japan, 58, 120, 120, GEOCHEMICAL SOCIETY OF JAPAN, 2011
本研究では，幅広い温度 (180-400度)・圧力 (1-5.5 GPa) 条件下でアミノ酸の重合実験を行い，生命の起源に必要なアミノ酸の安定性及び重合反応に対する温度・圧力の影響を実験的に調べることを目的とした．その結果，同じ温度条件下では，アミノ酸はより高圧下では長時間存在できていた．また，生成したペプチドの量もより高圧下で多くなることが明らかになった．アラニンが触媒を用いずに単量体から５量体まで重合した例は，本研究が初めてである．本研究によって，高圧下ではアミノ基の安定性がアミノ酸の安定性に大きく関わっている事が明らかとなり，冥王代の海洋堆積物中において，周囲のアンモニア濃度がアミノ酸の安定性に関係することが示唆された． - Sedimentary environments after 15 to 10 Ma Kuroko deposits in the Hokuroku basin: mineralogical and geochemical studies on framboidal pyrite
Endo Misato, Yamada Ryoichi, Otake Tsubasa, Kakegawa Takeshi
Abstracts of Annual Meeting of the Geochemical Society of Japan, 58, 95, 95, GEOCHEMICAL SOCIETY OF JAPAN, 2011
黒鉱鉱床を多く胚胎する秋田県北鹿地域は、鉱床形成時に海底近傍が無酸素状態であったという報告がある。本研究では、北鹿地域の黒鉱形成前後（15から10Ma）の連続した時間軸の中で古日本海に堆積した泥岩を研究対象とし、北鹿海盆低層の環境変動と微生物活動の関係を考察することを目的とした。黒鉱形成とほぼ同時期に堆積した泥岩中のフランボイダル黄鉄鉱は、その平均直径及び標準偏差が小さかった。フランボイダル黄鉄鉱は堆積物直上の海洋環境によってサイズ分布が異なると知られていることから、黒鉱形成時には北鹿海盆低層がeuxinicな海洋であり、広域的に硫化水素に富んだ低層水が分布していたと考えられる。また、黒鉱形成とほぼ同時期に堆積した泥岩中の黄鉄鉱の硫黄安定同位体比は非常に軽い値を示したことから、硫化水素生成は、黒鉱形成時であっても無酸素海洋中で活動していた硫酸還元菌によるものであり、海底熱水からの寄与は少ないことが見いだされた。 - Mechanisms of iron oxide transformations in hydrothermal systems
Tsubasa Otake, David J. Wesolowski, Lawrence M. Anovitz, Lawrence F. Allard, Hiroshi Ohmoto
GEOCHIMICA ET COSMOCHIMICA ACTA, 74, 21, 6141, 6156, Nov. 2010, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Primary haematite formation in an oxygenated sea 3.46 billion years ago
Masamichi Hoashi, David C. Bevacqua, Tsubasa Otake, Yumiko Watanabe, Arthur H. Hickman, Satoshi Utsunomiya, Hiroshi Ohmoto
NATURE GEOSCIENCE, 2, 4, 301, 306, Apr. 2009, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Ab initio calculations for equilibrium fractionations in multiple sulfur isotope systems
Tsubasa Otake, Antonio C. Lasaga, Hiroshi Ohmoto
CHEMICAL GEOLOGY, 249, 3-4, 357, 376, Apr. 2008, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Anomalous fractionation of sulfur isotopes during heterogeneous reactions
Antonio C. Lasaga, Tsubasa Otake, Yumiko Watanabe, Hiroshi Ohmoto
EARTH AND PLANETARY SCIENCE LETTERS, 268, 1-2, 225, 238, Apr. 2008, [Peer-reviewed], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Experimental evidence for non-redox transformations between magnetite and hematite under H-2-rich hydrothermal conditions
Tsubasa Otake, David J. Wesolowski, Lawrence M. Anovitz, Lawrence F. Allard, Hiroshi Ohmoto
EARTH AND PLANETARY SCIENCE LETTERS, 257, 1-2, 60, 70, May 2007, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
English, Scientific journal - Gold deposition in epithermal quartz-adularia veins: Experimental study on adsorption of gold on Al-Si systems
Ohtake, T, Yokoyama, T, Uchida, A, Watanabe, K, Izawa, E
Proceedings of 11th International Association on the Genesis of Ore Deposits Symposium, 2002, [International Magazine]
English, International conference proceedings
Other Activities and Achievements
- Machine learning for ore deposit research and exploration
Tsubasa Otake, 環境資源工学, 72, 1, 35, 38, Jun. 2025, [Invited], [Lead author, Corresponding author]
Japanese, Summary national conference - 資源開発における環境負荷低減のための同位体研究
大竹 翼, 同位体環境学がえがく世界：2020 年版, Apr. 2020, [Lead author]
Japanese, Introduction other - 岩石の風化と資源
大竹 翼, 季刊 資源と素材, 3, 3, 22, 23, Sep. 2018, [Lead author]
Japanese, Introduction scientific journal, 11763384 - Immobilization of Boron with MgO material in the presence of soluble silica
野澤 笑子, 大竹 翼, 佐藤 努, 地下水・土壌汚染とその防止対策に関する研究集会講演集, 23, 314, 317, 09 Nov. 2017
[地盤工学会], Japanese - 鉄鉱床は微生物が作った?
大竹 翼, 季刊 資源と素材, 1, 2, 24, 25, Jun. 2016, [Lead author]
Japanese - The Relationship Between Smectite/ Illite Ratios and Diagenetic History of Sandstone Reservoir, Batu Ayau Formation, Upper Kutai Basin, East Kalimantan, Indonesia
T. Puji Astuti, S. Surjono, I. Warmada, D.P. Kusuma, Y. Tsukada, T. Otake, T. Sato, International Petroleum Technology Conference 2014, Kuala Lumpur Convention Center, Kuala Lumpur, Malaysia, 17895, Dec. 2014
English, Summary international conference - Ca(OH)2溶液におけるモンモリロナイトの溶解速度—pHおよびC‐S‐H生成の影響—
木嶋達也, 中林亮, YOGARAJAH Elakneswaran, 小田治恵, 大竹翼, 佐藤努, 米田哲朗, 日本原子力学会秋の大会予稿集(CD−ROM), 2012, ROMBUNNO.B50, 622, 03 Sep. 2012
Ca(OH)2溶液におけるモンモリロナイトの溶解速度をフロースルー実験により算出した。溶解速度に対するpHの影響は先行研究で明らかにされているNaOH溶液におけるものと同様であった。一方、pHやCa濃度の条件によっては二次生成物としてC-S-Hが生成することが認められた。C-S-Hの生成がモンモリロナイトの溶解速度にどのような影響を与えるかを地球科学モデリングによって評価した。, Atomic Energy Society of Japan, Japanese - 12 Stability of amino acids and their oligomerization under high temperature and high pressure conditions(General Contributions,The 36^
annual meeting of the SSOEL-JAPAN (Abstracts))
Otake T., Taniguchi T., Furukawa Y., Nakazawa H., Kakegawa T., Viva origino, 39, 12, 12, 2011
文部省科学研究費総合研究(B)「原始地球上における生命の起源に関する研究」班, JapaneseStability of amino acids and peptides during diagenesis on the early Earth
T. Otake, T. Taniguchi, Y. Furukawa, H. Nakazawa, T. Kakegawa, GEOCHIMICA ET COSMOCHIMICA ACTA, 74, 12, A782, A782, Jun. 2010
English, Summary international conferenceLectures, oral presentations, etc.
- Machine learning for ore deposit research and exploration
Tsubasa Otake
The Resource Processing Society of Japan, 143rd academic conference, 18 Jun. 2025, Japanese, Invited oral presentation
18 Jun. 2025 - 18 Jun. 2025, [Invited] - Geochemical factors affecting hydrogen generation during low-temperature serpentinization
Tsubasa Otake
Natural Hydrogen Workshop in Japan, 14 Feb. 2025, English, Nominated symposium
14 Feb. 2025 - 14 Feb. 2025, 38572915, [Invited] - Significance and challenges of the sustainable mining of Ni mineral resources
Tsubasa Otake
International Symposium on Chemical and Biological Hazards on One Health: Toward Sustainable Mineral Development and Pollution Monitoring, 08 Oct. 2024, English, Oral presentation
08 Oct. 2024 - 09 Oct. 2024, University of Botswana, Gaborone, Botswana, 38572915, [International presentation] - 鉱山水処理施設におけるマンガン酸化物の沈殿メカニズム
大竹 翼
グリーンレメディエーション研究会シンポジウム「休廃止鉱山のグリーン・レメディエーションと関連分野の最前線」, 26 Sep. 2024, Japanese, Invited oral presentation
26 Sep. 2024 - 26 Sep. 2024, オンライン, Japan, [Invited], [Domestic Conference] - Identification of low crystalline Ni-bearing minerals in Ni lateritre deposits
Tsubasa Otake, Takahiro Daimon, Ryosuke Kikuchi, Tsutomu Sato
JpGU 2024, 27 May 2024, Japanese, Poster presentation
26 May 2024 - 31 May 2024, 幕張メッセ, Japan, 38572915, [Domestic Conference] - 32億年前の浅海性縞状鉄鉱層における化学沈殿と初期続成作用によるFeとMg同位体分別
大竹 翼, 杉浦 遼平, 申基澈, 大友 陽子, 掛川 武, 佐藤 努
日本地球化学会第70回年会, 21 Sep. 2023, Japanese, Oral presentation
21 Sep. 2023 - 23 Sep. 2023, 27289727 - Alteration patterns of host rocks in massive sulfide deposits that were possibly formed by subseafloor hydrothermal processes
T. Otake, A. Hoshi, K. Nakayama, T. Nozaki, R. Kikuchi, T. Sato
17th International Symposium on Water-Rock Interaction/14h Symposium on Applied Isotope Geochemistry, 21 Aug. 2023, English, Poster presentation
18 Aug. 2023 - 22 Aug. 2023, Sendai, Japan, 44296638, [International presentation] - Fe and Mg isotope fractionations in ferruginous sedimentary rocks from the ~3.2 Ga Moodies Group, Barberton Greenstone Belt, South Africa
T. Otake, R. Sugiura, K. Shin, Y. Ohtomo, T. Kakegawa, T. Sato
Goldschmidt 2023, 13 Jul. 2023, English, Oral presentation
10 Jul. 2023 - 14 Jul. 2023, Lyon, Frances, 27289727, [International presentation] - 低温蛇紋岩化反応における水素生成促進
大竹 翼, 菅原 あすか, 東野 駿太, 大友 陽子, 菊池 亮佑, 佐藤 努
JpGU 2023, 23 May 2023, Japanese, Poster presentation
38572915, [Domestic Conference] - 鉱床形成や環境影響理解のための安定同位体や微量元素の応用
大竹 翼
第4回『休廃止鉱山のグリーンレメディエーションと関連分野の最前線』, 07 Mar. 2023, Japanese, Invited oral presentation
27289727, [Invited], [Domestic Conference] - Formation of Ni-rich smectite in the Tagaung Taung Ni laterite deposit, Myanmar
Tsubasa Otake, Ayaka Murofushi, Takahiro Daimon, Ryosuke Kikuchi, Tsutomu Sato
Goldschmidt 2022, 15 Jul. 2022, English, Oral presentation
11 Jul. 2022 - 15 Jul. 2022, 11763384 - Sustainable development of mineral resources in Indonesia
Tsubasa Otake
The 17th Hokkaido Indonesian Student Association Scientific Meeting 2022, 11 Jul. 2022, English, Invited oral presentation
11 Jul. 2022 - 11 Jul. 2022, 27289727, [Invited] - Modification of sequential extraction method for better understanding of host phases in high grade Ni laterite ores
Tsubasa Otake, Takahiro Daimon, Kenzo Sanematsu, Yoshio Takahashi, Tsutomu Sato
JpGU 2022, 02 Jun. 2022, Japanese, Poster presentation
23 May 2022 - 03 Jun. 2022, 27289727 - Formation processes of Ni laterite deposits: Implications for exploration, processing, and environments
T. Otake
International Webinar 2021: Managing Mine and Metallurgical Wastes for a Sustainable Metal Industry: Volarization and Remediation, 26 Nov. 2021, Department of Metallurgical Engineering, Bandung Institute of Technology, English, Invited oral presentation
26 Nov. 2021 - 26 Nov. 2021, 27289727, [Invited], [International presentation] - Niラテライト鉱床の高品位鉱石形成に関わる地球化学的要因
大竹 翼
資源地質学会第70回年会, 30 Jun. 2021, Japanese, Invited oral presentation
11763384, [Invited] - Environmental study on the Pinpet Fe deposit in southern Shan State, Myanmar
Kyaw Zay Ya, Tsubasa Otake, Kenzo Sanematsu, Tsutomu Sato
JpGU-AGU Joint Meeting 2020, 12 Jul. 2020, Japanese, Poster presentation
12 Jul. 2020 - 16 Jul. 2020, 11763384 - Geochemical factors affecting Ni enrichment during chemical weathering of ultramafic rocks in Indonesia and Myanmar
Tsubasa Otake
JpGU-AGU Joint Meeting 2020, 12 Jul. 2020, Japanese, Poster presentation
12 Jul. 2020 - 16 Jul. 2020, 11763384 - 低温蛇紋岩化反応における水素生成量に与えるシリカの影響
大竹翼, 東野 駿太, 川喜田 竜平, 佐藤 努
日本地球化学会第66回年会, 19 Sep. 2019, Japanese, Oral presentation
[Domestic Conference] - Mineralogical and Fe isotope correlations between Kuroko-type VMS deposits and a seafloor hydrothermal deposit in Okinawa Trough
T. Otake, T. Ikeshima, T. Sato, J.-I. Ishibashi, T. Nozaki, H. Kumagai, L. Maeda, onboard members
Goldschmidt 2019, 22 Aug. 2019, English, Oral presentation
[International presentation] - Comparison of ore formation processes between VHMS deposits and a submarine hydrothermal ore deposit in Okinawa Trough
T. Otake, T. Ikeshima, T. Sato, J-I Ishibashi, T. Nozaki, H. Kumagai, L. Maeda, onboard members
Goldschmidt 2018, 17 Aug. 2018, English, Oral presentation
[International presentation] - The role of multi-stage processes on REE enrichment in Kangankunde carbonatites, Malawi
F. Chikanda, T. Otake, Y. Ohtomo, T. Sato
Goldschmidt 2018, 14 Aug. 2018, English, Oral presentation
[International presentation] - Ore formation processes in a submarine hydrothermal ore deposit in Izena Hole, Okinawa Trough: comparison with Kuroko deposits
T. Otake, T. Ikeshima, T. Sato, J. Ishibashi, T. Nozaki, H. Kumagai, L. Maeda, Onboard members
Japan Geoscience Union Meeting 2018, 23 May 2018, English, Poster presentation
[Domestic Conference] - Hydrothermal synthesis of chromian spinel from iron and chromium hydroxides using a flow-through apparatus
T. Otake, M. Nishikata, Y. Ohtomo, Y. Kimura, D. Kawamoto, T. Sato
American Chemical Society National Meeting, 18 Mar. 2018, English, Oral presentation
[International presentation] - Large Fe isotope fractionations found in sulfide ores and ferruginous cherts in volcanogenic massive sulfide deposits
T. Otake, S. Nakamura, R. Yamada, K. Shin, S. Ono, T. Sato
Goldschmidt Conference 2017, 16 Sep. 2017, English, Poster presentation
[International presentation] - 火山性塊状硫化物鉱床における鉄同位体分別と鉱床形成プロセス
大竹翼, 中村峻介, 山田亮一, 申基澈, 小野修司, 佐藤努
日本地球惑星科学連合2017年大会, 25 May 2017, Japanese, Oral presentation
[Domestic Conference] - Spatial and temporal distributions of metallic ore deposits
Tsubasa Otake
2016 5th International Doctoral Symposium-Sustainable Management of Resources and Environment in the 21st Century, 10 Nov. 2016, English, Invited oral presentation
[Invited], [International presentation] - フロースルー型装置を用いた低温熱水環境下におけるクロムスピネルの合成実験
大竹翼, 梁智現, 大友陽子, 佐藤努
2016年度日本地球化学会年会, 14 Sep. 2016, Japanese, Oral presentation
[Domestic Conference] - 沖縄トラフ海底熱水鉱床における鉱石鉱物組成の多様性とその定量的評価
後藤翔太, 大竹翼, 川本大祐, 横山拓史, 小野修司, 伊藤真由美, 佐藤努
2016年資源地質学会年会, 23 Jun. 2016, Japanese, Oral presentation
[Domestic Conference] - Transitions in oceanic and hydrothermal environments inferred from Fe isotopes in ferruginous and manganeferous sedimentary rocks
T. Otake, K. Shin
第5回同位体環境学シンポジウム, 25 Dec. 2015, Japanese, Poster presentation
[Domestic Conference] - 秋田県北鹿地域にみられる鉄・マンガンに富む化学堆積岩の鉄同位体比の特徴と黒鉱鉱床との関係性
大竹翼, 鈴木凌平, 山田亮一, 申基澈, 昆慶明, 佐藤努
2015年度日本地球化学会第62回年会, 16 Sep. 2015, Japanese, Oral presentation
[Domestic Conference] - Environmental impacts associated with heavy mineral processing: Case study in Malaysia
Tsubasa Otake
The World Forum Meeting and Conference “Resources and Sustainability”, 15 Sep. 2015, English, Invited oral presentation
[Invited], [International presentation] - Fe isotope variations in ferruginous sedimentary rocks above Kuroko deposits in the Hokuroku district, Northeast Japan
T. Otake, R. Suzuki, R. Yamada, K. Shin, Y. Kon, T. Sato
Goldschmidt Conference 2015, 18 Aug. 2015, English, Poster presentation
[International presentation] - 黒鉱鉱床形成後に堆積した鉄・マンガン堆積岩に記録された鉄同位体分別
大竹翼, 鈴木陵平, 山田亮一, 申基澈, 昆慶明, 佐藤努
資源地質学会第65回年会講演会, 25 Jun. 2015, Japanese, Oral presentation
[Domestic Conference] - 秋田県北鹿地域に産する鉄・マンガン堆積岩の鉄同位体比と海洋環境の変動
大竹翼, 鈴木凌平, 申基澈
第4 回同位体環境学シンポジウム, 22 Dec. 2014, Japanese, Poster presentation
[Domestic Conference] - Environmental impacts associated with REE resources: case study of the tin tailing processing industry in Malaysia
T. Otake, A. Ito, S. Anraku, K.-S. Ariffin, F.-Y. Yeoh, T. Sato
4th Asia Africa Mineral Resources Conference, 13 Oct. 2014, English, Invited oral presentation
[Invited], [International presentation] - 鉄・マンガン堆積岩中のレアアースパターンと鉄同位体比から推定される黒鉱鉱床形成後の堆積環境の変遷
大竹翼, 鈴木陵平, 山田亮一, 申基澈, 昆慶明, 佐藤努
2014年度日本地球化学会年会, 16 Sep. 2014, Japanese, Oral presentation
[Domestic Conference] - 研究者を志すきっかけとなった南アフリカの鉱床達
大竹 翼
鉱物科学会若手の会夜間集会, 01 May 2014, Japanese, Public discourse
[Invited], [Domestic Conference] - 海洋における酸化還元環境の変遷と元素濃集
大竹 翼
日本地球惑星科学連合2014年大会, 28 Apr. 2014, Japanese, Invited oral presentation
[Invited], [Domestic Conference] - Chromium Enrichment in sedimentary rocks deposited in shallow water in the 3.2 Ga Moodies Group, South Africa
T. Otake, Y. Sakamoto, S. Itoh, H. Yurimoto, T. Kakegawa
Goldschmidt Conference 2013, 29 Aug. 2013, English, Poster presentation
Florence, Italy, [International presentation] - Enrichment of chromium in Banded Iron Formations deposited in a shallow water in the Barberton Greenstone Belts, South Africa
T. Otake, Y. Sakamoto, S. Itoh, H. Yurimoto, T. Kakegawa
2013年資源地質学会年会, 27 Jun. 2013, Japanese, Oral presentation
東京, [Domestic Conference] - 縞状鉄鉱層の微量元素・同位体分析によって紐解く地球と生命の共進化
大竹 翼
第73回分析化学討論会, 18 May 2013, Japanese, Invited oral presentation
函館, [Invited], [Domestic Conference] - CONCENTRATION OF ELEMENTS IN CHEMICAL SEDIMENTARY ROCKS RELATED TO CHANGES IN EARTH’S SURFACE ENVIRONMENTS
Tsubasa Otake
5th AUN/SEED-Net Regional Conference on Geological Engineering, 2013, English, Keynote oral presentation
[Invited], [International presentation] - 資源地質学で紐解く地球と生命の共進化
大竹 翼
北海道大学工学部 講演会, 2012, Japanese, Public discourse
[Invited], [Domestic Conference] - 縞状鉄鉱層：資源地質学からアストロバイオロジーへ
大竹 翼
東京工業大学 地惑セミナー, 2012, Japanese, Invited oral presentation
[Invited], [Domestic Conference] - 太古代に見られる鉄に富んだ堆積岩の成因と当時の地球表層環境
大竹 翼
産業義技術総合研究所 GREENシーズセミナー, 2012, Japanese, Public discourse
[Invited], [Domestic Conference] - 北鹿地域における珪質堆積岩中のレアアースパターンと堆積環境の変遷
大竹翼, 山田亮一, 鈴木稜平, 掛川武
日本地球化学会2012年年会, 2012, Japanese, Oral presentation
[Domestic Conference] - ３２億年前の浅海性化学堆積岩から推定される当時の地球表層環境
大竹翼, 坂本祐樹, 伊藤正一, 圦本尚義, 掛川武
地球惑星科学連合2012年大会, 2012, Japanese, Invited oral presentation
[Invited], [Domestic Conference] - Origins of magnetite and chromite in sedimentary rocks in a shallow water environment in the 3.2 Ga Moodies Group, South Africa.
T. Otake, Y. Sakamoto, S. Itoh, H. Yurimoto, T. Kakegawa
2012 AGU Fall Meeting, 2012, English, Poster presentation
[International presentation] - Earth’s surface environments inferred from chemical sedimentary rocks deposited in a shallow ocean 3.2 billion years ago.
T. Otake, Y. Sakamoto, S. Itoh, H. Yurimoto, T. Kakegawa
G-COE symposium 2012: Achievements of G-COE program for Earth and planetary dynamics and the future perspective, 2012, English, Invited oral presentation
[Invited], [International presentation] - 生命の起源および進化に関する研究における海洋堆積物の続成/変成作用の重要
大竹 翼
東京大学地球惑星システム科学セミナー, 2011, Japanese, Public discourse
[Invited], [Domestic Conference] - 高温高圧条件下における固体アミノ酸の安定性と重合反応
大竹翼, 谷口尚, 古川善博, 中沢弘基, 掛川武
日本地球化学会第58回年会, 2011, Japanese, Poster presentation
[Domestic Conference] - Mechanisms of iron oxide transformations in hydrothermal systems
Otake, T, Wesolowski, D.J, Anovitz, L. M, Allard, L. F, Ohmoto, H
地球惑星科学連合2011年大会, 2011, Japanese, Oral presentation
[Domestic Conference] - Origins of chromite found in chemical and clastic sedimentary rocks of the 3.2 Ga Moodies Group, South Africa.
Otake, T, Sakamoto, Y, Kakegawa, T
Goldschmidt Conference 2011, 2011, English, Oral presentation
[International presentation] - Stability of amino acids and their oligomerization under high-pressure conditions
Otake, T, Taniguchi, T, Furukawa, Y, Nakazawa, H, Kakegawa, T
Origins 2011 International Conference, 2011, English, Poster presentation
[International presentation] - 縞状鉄鉱層中の初生鉱物としての赤鉄鉱の沈殿と続成作用による磁鉄鉱へのトランスフォーメーション
大竹 翼
九州大学大学院生企画シンポジウム, 2010, Japanese, Public discourse
[Invited], [Domestic Conference] - 初期地球における海洋堆積物中でのアミノ酸の安定性と重合反応
大竹翼, 谷口尚, 古川善博, 中沢弘基, 掛川武
第51回高圧討論会, 2010, Japanese, Oral presentation
[Domestic Conference] - The Stability of amino acids and peptides during on the early Earth
Otake, T, Taniguchi, T, Furukawa, Y, Nakazawa, H, Kakegawa, T
Global-Network Symposium on Earth’s Dynamics, 2010, English, Oral presentation
[International presentation] - The stability of amino acids and peptides during diagenesis on the early Earth
Otake, T, Taniguchi, T, Furukawa, Y, Nakazawa, H, Kakegawa, T
地球惑星科学連合2010年大会（国際セッション）, 2010, English, Oral presentation
[International presentation] - Stability of amino acids and peptides during diagenesis on the early Earth
Otake, T, Taniguchi, T, Furukawa, Y, Nakazawa, H, Kakegawa, T
2010 Goldschmidt conference, 2010, English, Poster presentation
[International presentation] - 平衡及び非平衡反応における硫黄の同位体効果と質量依存性の理論的研究
大竹 翼
日本地球化学会第57回大会, 2010, Japanese, Invited oral presentation
[Invited], [Domestic Conference] - 海洋堆積物の続成環境模擬実験における混合アミノ酸の重合と安定性
大竹翼, 谷口尚, 古川善博, 中沢弘基, 掛川武
日本地球化学会第57回大会, 2010, Japanese, Poster presentation
[Domestic Conference] - A New Surface Reaction Model for Anomalous Fractionation of Sulfur Isotopes
地球惑星科学連合2009年大会, 2009, Japanese, Oral presentation
[Domestic Conference] - 初期地球における有機物と硫黄化合物の表面反応による特異な同位体分別の可能性
T. Otake, A. C. Lasaga, Y. Watanabe, H. Ohmoto
第２回アストロバイオロジーワークショップ, 2009, Japanese, Oral presentation
[Domestic Conference] - Theoretical investigations for anomalous fracionation of sulfur isotopes during a surface reaction
T. Otake, A. C. Lasaga, Y. Watanabe, H. Ohmoto
AGU Fall Meeting, 2009, English, Poster presentation
[International presentation] - A New Surface Reaction Model for Anomalous Fractionation of Sulfur Isotopes
地球惑星科学連合2009年大会, 2009 - Theoretical investigations of equilibrium and surface adsorption effects on mass-dependent fractionation in multiple sulfur isotope systems
T. Otake, A. C. Lasaga, Y. Watanabe, H. Ohmoto
Astrobiology Science Conference, 2008, English, Poster presentation
[International presentation] - Anomalous S isotope fractionations during reactions with an organic surface: I. theoretical investigations
T. Otake, A. C. Lasaga, Y. Watanabe, H. Ohmoto
18th Annual Goldschmidt Conference, 2008, English, Oral presentation
[International presentation] - Experimental evidence for non-redox transformation of hematite from magnetite under reducing conditions
take, T, Wesolowski, D.J, Anovitz, L. M, Allard, L. F, Ohmoto, H
Astrobiology Science Conference, 2006, English, Oral presentation
[International presentation] - Non-redox transformation of magnetite - hematite under H2-rich hydrothermal conditions
Otake, T, Wesolowski, D.J, Anovitz, L. M, Allard, L. F, Ohmoto, H
19th General Meeting of the International Mineralogical Association, 2006, English, Oral presentation
[International presentation] - Experimental evidence of non-redox transformation between magnetite and hematite under H2-rich hydrothermal conditions
Otake, T, Wesolowski, D.J, Anovitz, L. M, Allard, L. F, Ohmoto, H
Annual Meeting of the Geological Society of America, 2006, English, Oral presentation
[International presentation] - Magnetite transformation to hematite under H2 pressure at 150ºC
Otake, T, Wesolowski, D.J, Anovitz, L. M, Allard, L. F, Ohmoto, H
15th Annual Goldschmidt Conference, 2005, English, Oral presentation
[International presentation] - “Detrital” pyrites in the Archean Witwatersrand Basin (South Africa) are not detrital
T. Otake, Y. Watanabe, W. Altermann, H. Ohmoto
Astrobiology Science Conference, 2004, English, Poster presentation
[International presentation] - Al－Si酸化物表面への金(III)イオンの吸着実験 石英脈への金の濃縮における6配位Alの重要性－
大竹翼, 横山拓史, 内田明子, 渡邊公一郎, 井澤英二
資源地質学会, 2002, Japanese, Poster presentation
[Domestic Conference] - Gold deposition in epithermal quartz-adularia veins: Epithermal study on adsorption of gold on Al-Si systems
Ohtake, T, Yokoyama, T, Uchida, A, Watanabe, K, Izawa, E
11th International Association on the Genesis of Ore Deposits Symposium, 2002, English, Poster presentation
[International presentation]
Courses
- 地球の科学
東北大学 - 自然科学総合実験
東北大学 - 応用地質学
北海道大学 - 資源化学I
北海道大学 - Technical English (in Japanese)
Hokkaido Unviersity - Applied Geology (in Japanese)
Hokkaido University - Environmental Geology II
Hokkaido University - Seminar for PARE
Hokkaido University - Field Work Training for PARE
Hokkaido Unviersity - PARE演習Ⅱ－人口・活動・資源・環境の連環－
北海道大学 - PARE 実習Ⅱ－人口・活動・資源・環境の連環
北海道大学 - Environmental Geology II
北海道大学大学院 - 環境地質学特論
北海道大学大学院 - 資源循環システム実験II（岩石の肉眼鑑定、顕微鏡観察、地形図・地質図）
北海道大学 - 技術英語
北海道大学
Affiliated academic society
Research Themes
- 科学掘削コア試料を用いた32億年前の金属元素循環と酸化還元環境の解明
科学研究費助成事業
Apr. 2024 - Mar. 2028
大竹 翼
日本学術振興会, 基盤研究(A), 北海道大学, Principal investigator, 24H00436 - Geochemical processes between microbes-sulfide minerals-water responsible for ore deposit formation
Grants-in-Aid for Scientific Research
Apr. 2023 - Mar. 2026
Shigeshi Fuchida, Tsubasa Otake, Kenta Yoshida
Japan Society for the Promotion of Science, Grant-in-Aid for Transformative Research Areas (B), Tokyo University of Marine Science and Technology, Coinvestigator, 23H03814 - Quantifying the microbial contribution to the hydrothermal deposit formation toward the BIOre concept
Grants-in-Aid for Scientific Research
Apr. 2023 - Mar. 2026
Tatsuo Nozaki
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Japan Agency for Marine-Earth Science and Technology, Coinvestigator, 23H01914 - Promotion of hydrogen generation during low temperature serpentinization
Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)
Jun. 2022 - Mar. 2025
Tsubasa Otake
Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Pioneering), Hokkaido University, Principal investigator, 22K18325 - Understanding biosphere-hydrosphere-atmosphere-lithosphere interactions 3.2 billion years ago with an international continental drilling program
Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)
Apr. 2020 - Mar. 2024
Tsubasa Otake
R3年度はR2年度に現地での新型コロナ感染拡大のため遅れていた科学掘削が開始された。バーバトン地域の4サイト(site 2, 3, 4, 5)において合計7本のコアを掘削した。これらの掘削コアは、当時の海洋環境に関する情報を保持していると考えられる化学堆積岩（縞状鉄鉱層: BIF, ジャスパー）や沿岸域の生態系に関する情報を保存している可能性がある浅海性堆積岩を含んでいる。現地のコア記載も進んでいる。またすでに露頭や稼行中の鉱山で採取済みの岩石試料を使用して分析手法の確立に取り組んだ。鉄 (Fe) およびクロム (Cr) 安定同位体比の分析についてはBIF試料において良好に単離などの前処理を行うことができ、分析条件を確立することができた。Fe同位体比については十数試料の分析が完了しており、その値から海洋からの化学沈澱のシグナルを保持していることが明らかとなった。その同位体変動幅は鉄の酸化沈澱でのみ説明可能であり、32億年まえの浅海域で海洋中の溶存二価鉄が酸化されるプロセスがすでに存在していたと考えられる。また、有機物を抽出して微細構造分析を行ったところフィルム状の有機物を検出し、比較的未熟成であることも明らかとなった。さらにその有機物に含まれている窒素（N）の同位体比を測定したところ、誤差は大きかったが酸素発生光合成細菌の寄与を示唆する同位体的に重たい値を示した。ヨハネスブルグ大学におけるLA-ICP-MSによるジルコンの分析についても条件などを確立し、分析環境を整えた。
Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (A), Hokkaido University, Principal investigator, 20H00184 - The Impact of Industrialization on the Cultural Landscape and Food Security of the Wetlands : A Case Study of the Bangpakong River Basin, Chachoengsao, Thailand.
Bilateral Programs
Apr. 2021 - Mar. 2023
Hajime Matsushima, Ariya Aruninta, Ryusuke Hatano, Tishufumi Igarashi, Tsubasa Otake, Satoshi Koike, Junjiro Negishi, John R. Bower, Ryo Takeda
JSPS, NRCT-JSPS Joint Research Program, Hokkaido University;Chulalongkorn University, Coinvestigator, ［Internationally co-authored］, JPJSBP120219201 - マグネシウムシリケート水和物：その正体と生成の全容解明
Grant-in-Aid for Scientific Research (A)
Apr. 2019 - Mar. 2022
Tsutomu Sato
JSPS, Coinvestigator, Competitive research funding - Engineering application of hydrogen generation by water-rock interactions in natural systems
Grant-in-Aid for challenging Exploratory Research
Apr. 2017 - Mar. 2020
Tsubasa Otake
JSPS, Principal investigator, Competitive research funding - New isotope signatures for rare metals concentrated with Fe colloids
Grant-in-Aid for Scientific Research (B)
Apr. 2017 - Mar. 2020
Tsubasa Otake
JSPS, Principal investigator, Competitive research funding - Potential of Geochemical signatures of overlying chemical sedimentary rocks as an exploration tool for VMS deposits
一般研究助成
Apr. 2016 - Mar. 2019
Tsubasa Otake
Japan Mining Industry Association, Principal investigator, Competitive research funding - Next Generation Technology for Ocean Resources Exploration
Cross-minitrial Strategic Innovation Promotion Program
Oct. 2015 - Mar. 2019
Junichiro Ishibashi
Council for Science, Technology, and Innovation, Coinvestigator, Competitive research funding - Chemical concentration processes in the surface environments on early Earth
KAKENHI Grant-in-Aid for Young Scientists(A)
Apr. 2014 - Mar. 2017
Tsubasa Otake
JSPS, Principal investigator, Competitive research funding - レアアース資源開発における環境影響評価と精錬廃水からの放射性物質除去法の確立
国内研究助成（萌芽的研究）
Oct. 2013 - Sep. 2014
大竹 翼
クリタ水・環境化学振興財団, Principal investigator, Competitive research funding - 局所安定同位体比分析によって明らかにする鉄に富んだ堆積岩の成因と初期地球の表層環境
北海道大学総長室事業推進経費
Apr. 2012 - Mar. 2013
大竹 翼
北海道大学, Principal investigator, Competitive research funding - Sulfur isotope fractionations and mass dependency during abiotic reactions
KAKENHI
Apr. 2010 - Mar. 2012
Tsubasa Otake
Results of a series of theoretical investigations showed that nuclear field shift effect will not produce anomalous fractionations of sulfur isotopes while various surface reaction may produce anomalous fractionation of sulfur isotopes. On the other hand, kinetic isotope effect during abiotic reactions may not deviate from the mass-dependent relationships predicted on equilibrium isotope exchange reactions.
JSPS, Grant-in-Aid for Young Scientists (B), Principal investigator, Competitive research funding, 22740342 - 硫黄の未知同位体分別効果の理論的及び実験的解明
若手研究者奨励研究基金
Apr. 2009 - Mar. 2010
大竹 翼
東北大学大学院理学研究科, Principal investigator, Competitive research funding
