top of page

Peer-​reviewed articles​
Google Scholar

Corresponding author

  1. Masuda, Y., Yokoyama, T., Iizuka, T., & Hibiya, Y. (2025). Constraining the origin of isotopic variations in chondritic materials through titanium and chromium isotopic analyses of refractory inclusions. Earth and Planetary Science Letters, 664, 119447.

  2. Masuda, Y., Schiller, M., Bizzarro, M., & Yokoyama, T. (2024). Calcium isotope evidence for the formation of early condensates in the Solar System from unmixed reservoirs with distinct nucleosynthetic origins. Geochimica et Cosmochimica Acta, in press

  3. Masuda, Y., Niki, S., Hirata, T., Yokoyama, T. Distribution analysis of rare earth elements in fine-grained CAIs of the Allende meteorite using multiple spot-femtosecond LA-ICP-MS. Meteoritics and Planetary Science, dio: 10.1111/maps.14190

  4. Masuda, Y., Yokoyama, T. Strontium isotope evidence for the repeated formation of refractory inclusions in the Allende meteorite. Geochimical et Cosmochimica Acta 345, 50-61, 2023. doi: 10.1016/j.gca.2023.01.024

  5. Masuda, Y., Yokoyama, T., Okabayashi, S., Ishikawa, A., Iwamori, H. Chemical and isotopic evaluation of a micro-sampling method using laser ablation and membrane filter (LAF). Geostandards and Geoanalytical Research, 46, 205-222, 2022, doi:10.1111/ggr.12426

Co-author

  1. Fukai, R., Takeda, Y., Masuda, Y., Yamamoto, D., Iba, Y., Sasaki, S., ... & Usui, T. (2025). The bright-field grinding tomography of coarse-grained calcium‑aluminum-rich inclusions in the Allende meteorite. Icarus, 116648.

  2. Yokoyama, T., Wadhwa, M., Iizuka, T., Rai, V., Gautam, I., Hibiya, Y., Masuda, Y., Haba, M.K., et al. Water circulation in Ryugu asteroid affected the distribution of nucleosynthetic isotope anomalies in returned sample. Science Advances 9, eadi7048, 2023. DOI: 10.1126/sciadv.adi7048

Ryugu initial analysis papers

  1. Schonbachler, M., Fehr, M., Yokoyama, T., Gautam, I., Nakanishi, N., Haba, M.K., …, Masuda, Y., et al. (2025) Zirconium isotope composition indicate s-process depletion in samples returned from asteroid Ryugu. Meteoritics and Planetary Science, 60, 3-16.

  2. Spitzer, F., Kleine, T., Burkhardt, C., Hopp, T., Yokoyama, T., Abe, Y., ... Masuda, Y., et al. (2024). The Ni isotopic composition of Ryugu reveals a common accretion region for carbonaceous chondrites. Science Advances, 10(39), eadp2426.

  3. Yui, H., Urashima, S. H., Onose, M., Morita, M., Komatani, S., Nakai, I., ..., Masuda, Y., et al. (2024). Pyrrhotites in asteroid 162173 Ryugu: Records of the initial changes on their surfaces with aqueous alteration. Geochimica et Cosmochimica Acta, Doi: 10.1016/j.gca.2024.06.016

  4. Kita, N.T., …, Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., et al. Disequilibrium oxygen isotope distribution among aqueously altered minerals in Ryugu asteroid returned samples. Meteoritics and Planetary Science, xxx, in press.

  5. Hu, Y., Moynier, F., Dai, W., Paquet, M., Yokoyama, T., …, Gautam, I., Haba, M.K., …, Masuda, Y., et al. Pervasive aqueous alteration in the early Solar System revealed by potassium isotopic variations in Ryugu samples and carbonaceous chondrites. Icarus 489, 115884, 2024. Doi: 10.1016/j.icarus.2023.115884

  6. Aléon, J., …, Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., et al. Hydrogen in magnetite from asteroid Ryugu. Meteoritics and Planetary Science, 2024

  7. Morita, M., …. Yokoyama, T., …, Gautam, I., Haba, M.K., …, Masuda, Y., et al. Analysis of cation composition in dolomites on the intact particles sampled from asteroid Ryugu. Analytical Chemistry, 2023, 96.1: 170-178.

  8. Torrano, Z.A., Jordan, M.K., Mock, T.D., Carlson, R.W., Gautam, I., Haba, M.K., Yokoyama, T., …, Masuda, Y., et al. Neodymium-142 deficits and samarium neutron stratigraphy of C-type asteroid (162173) Ryugu. Meteoritics and Planetary Science, 2023, Doi: 10.1111/maps.14109

  9. Nakanishi, N., Yokoyama, T., Ishikawa, A., Walker, R.J. …, Gautam, I., Haba, M.K., …, Masuda, Y., et al. Nucleosynthetic s-Process Depletion in Mo from Ryugu samples returned by Hayabusa2. Geochemical Perspectives Letters 28, 31-36, 2023. Doi: 10.7185/geochemlet.2341

  10. Bizzarro, M., Schiller, M., Yokoyama, T., …, Gautam, I., Haba, M.K., …, Masuda, Y., et al. The magnesium isotope composition of samples returned from asteroid Ryugu. Astophys. J. Lett. 958, 2023. Doi: 10.3847/2041-8213/ad09d9

  11. Tang, H., Young, E.D., …, Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., et al. The oxygen isotopic composition of samples returned from asteroid Ryugu with implications for the nature of the parent planetesimal. Planetary Science Journal 4, 144, 2023. doi: 10.3847/PSJ/acea62

  12. Fujiya, W., … Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., et al. Carbonate record of the change in oxygen fugacity and gaseous species in asteroid Ryugu. Nature Geoscience 16, 675–682, 2023. doi: 10.1038/s41561-023-01226-y

  13. Nguyen, A. N., … Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., et al. Abundant presolar grains and primordial organics preserved in carbon-rich exogenous clasts in asteroid Ryugu. Science Advances, eadh1003, 2023. doi: 10.1126/sciadv.adh1003

  14. Piani, L., …Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., … Hydrogen isotopic composition of hydrous minerals in asteroid Ryugu. Astrophysical Journal Letters, 946:L43 (11pp), 2023. doi: 10.3847/2041-8213/acc393

  15. Paquet, M., Moynier, F., Yokoyama, T., …Gautam, I., Haba, M.K., …, Masuda, Y., et al. Contribution of Ryugu-like material to Earth’s volatile inventory by Cu and Zn isotopic analysis. Nature Astronomy, 24, 1-6, 2023. doi: 10.1038/s41550-022-01846-1

  16. Yokoyama, T., Nagashima, K., …Gautam, I., Haba, M.K., Masuda, Y., …Yurimoto, H. Samples returned from the asteroid Ryugu are similar to Ivuna-type carbonaceous meteorites. Science, 2023. doi: 10.1126/science.abn7850

  17. Kawasaki, N., …Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., …Yurimoto, H. (69 of 94 authors). Oxygen isotopes of anhydrous primary minerals show kinship between asteroid Ryugu and comet 81P/Wild2. Science Advances, 8, eade2067, 2022. doi: 10.1126/sciadv.ade2067

  18. Moynier, F., Dai, W., Yokoyama, T., …Gautam, I., Haba, M.K., …, Masuda, Y., et al. The Solar System calcium isotopic composition inferred from Ryugu samples. Geochemical Perspectives Letters, 24, 1-6, 2022. doi: 10.7185/geochemlet.2238

  19. Hopp, T., Dauphas, N., …Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., …Yurimoto, H. (66 of 92 authors). Ryugu’s nucleosynthetic heritage from the outskirts of the Solar System. Science Advances, 8, eadd8141, 2022. doi: 10.1126/sciadv.add8141

  20. Barosch, J., Nittler, L.R., …Gautam, I., Haba, M.K., …, Masuda, Y., Yokoyama, T., …Yurimoto, H. (60 of 124 authors). Presolar stardust in asteroid Ryugu. Astrophysical Journal Letters, 935:L3 (12pp), 2022. doi: 10.3847/2041-8213/ac83bd

Presentations

International Conference

  1. Yuki Masuda, Martin Schiller, Martin Bizzarro, Tetsuya Yokoyama　NUCLEOSYNTHESIS CALCIUM ISOTOPE ANOMALIES IN REFRACTORY INCLUSIONS FROM THE ALLENDE METEORITE, LPSC 2024, Huston, USA, in person, oral, 2024/3/15

  2. Yuki Masuda, Tetsuya Yokoyama, Tsuyoshi Iizuka, Yuki Hibiya　 Nucleosynthetic isotopic anomalies of Ti and Cr in fine-grained CAIs from the Allende meteorite, Goldschmidt conference, Lion, France, in person, oral, 2023/7/11

  3. Yuki Masuda, Sota Niki, Takafumi Hirata and Tetsuya Yokoyama　Distribution of rare-earth elements in fine-grained Calcium and Aluminum-rich inclusions from Allende meteorite.　Goldschmidt2022, 1dP4 (poster), Hawaii, USA, Jul, 2022

  4. Y. Masuda and T. Yokoyama　Origin of nucleosynthetic Sr isotope anomalies in fine grained calcium and aluminum rich inclusions from Allende　53rd Lunar and Planetary Science Conference (2022), 2039 (oral), online, Mar, 2022

  5. YUKI MASUDA, TETSUYA YOKOYAMA, SATOKI OKABAYASHI, AKIRA ISHIKAWA 　Development of Laser Ablation with Filter (LAF) sampling method for micro-scale isotopic analysis of geologic materials Goldschmidt 2020　13f/08:39/Thu (oral), online, Jun, 2020

  6. Yuki Masuda, Tetsuya Yokoyama, Satoki Okabayashi, Akira Ishikawa, Small-scale isotopic analysis of geological materials using the Laser Ablation with Filter (LAF) sampling method　JpGU-AGU 2020　MTT51-09 (Poster), online, Jul, 2020

Domestic Conference

  1. 増田雄樹、Martin Schiller, Martin Bizzarro, 横山哲也 Nucleosynthesis calcium isotope anomalies in refractory inclusions from the CV chondrites, JpGU 2024, 幕張千葉県 2024年5月30日

  2. 増田雄樹、Martin Schiller, Martin Bizzarro, 横山哲也 炭素質コンドライト中難揮発性包有物の核合成起源カルシウム同位体異常, 日本質量分析学会同位体比部会, 青森県浅虫温泉, 口頭, 2023/11/21

  3. 増田雄樹、竹田裕介、深井稜汰, 伊庭靖弘, 笹木慎太郎, 池上森, 臼井寛裕, 奥住聡, 荒川創太, 超高解像トモグラフィ・３D レンダリング技術を用いたアエンデ隕石中の難揮発性凝縮物の形状観察, 惑星科学会, 広島, 口頭, 2023/10/11

  4. 増田雄樹、横山哲也、飯塚毅、日比谷由紀　CAIの核合成起源 Cr-Ti 同位体異常, 日本地球科学会第70回年会,東京海洋大学品川キャンパス, 現地口頭, 2023/9/23

  5. 増田雄樹、横山哲也、山下勝行TIMSを用いた高精度Ca同位体測定法の検討　日本質量分析学会同位体比部会2022 (口頭) 熱海 2022年12月

  6. 増田雄樹、横山哲也、飯塚毅、日比谷由紀　アエンデ隕石中細粒CAIの核合成起源Ti同位体異　2022年度日本地球化学会第69 回年会 PR0020（口頭） 高知大学 2022 年9 月

  7. 増田雄樹、仁木創太、横山哲也、平田岳史　アエンデ隕石中細粒CAIの希土類元素イメージング　日本地球惑星科学連合2022年大会　MTT44-04（口頭）　千葉　2022年5月

  8. 増田雄樹、横山哲也　Allende隕石中細粒 CAI に見られる核合成起源のSr 同位体異常の多様性　2021年度日本地球化学会第68回年会　PR0180（口頭）　オンライン　2021年9月　

  9. 増田雄樹・横山哲也,岡林識起,明星邦弘 ［題名］Laser Ablation with Filter (LAF) サンプリング法の開発 ［学会］2019年度日本質量分析学会同位体比部会　［番号］ P-14（ポスター）　［場所］登別北海道　［年月］2019年11月 

  10. 増田雄樹、横山哲也、明星邦弘 ［題名］Allende隕石中の難揮発性包有物にみられる核合成起源のSr同位体異常 ［学会］2019年度日本地球化学会第66回年会　［番号］ G07 3A10（口頭）　［場所］東京大学本郷キャンパス　［年月］2019年9月

  11. Yuki Masuda, Tetsuya Yokoyama, Kunihiro Myojo, Satoki Okabayashi ［題名］Preliminary analysis of nucleosynthetic Sr isotope anomalies in amoeboid olivine aggregates from the Allende meteorite ［学会］JpGU2019　［番号］MTT48-P07（ポスター）［場所］幕張千葉県 ［年月］2019年5月

bottom of page