Yokoyama Laboratory investigates origin and evolution of the early solar system materials by isotopic and elemental analysis of terrestrial and extraterrestrial mateterials.
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04/01/2026 New members have joined our group.
● RECENT TOPICS
Yokoyama, T.., Avice, G., Busemann, H., Dauphas, N. Galvin, D.P., King, A.J., Kleine, T., Lodders, K., Moynier, F., Schonbachler, M., Takano, Y., Wang, K., Yabuta, H., Enokido, Y., Fukai, R., Tachibana, S., Usui, T.
Ryugu Reference Project: Recommendations from the Measurement Definition Team
Meteoritics and Planetary Science, 2026. DOI: 10.1111/maps.70141
Lopez Garcia, K., Yokoyama, T..,Gautam, I., Haba, M.K., Iizuka, T., Nakanishi, N., Fukai, R.
Small-scale elemental abundance variations in Ryugu particles from touchdown 1.
Meteoritics and Planetary Science, 2026. DOI: 10.1111/maps.70109
Iizuka, T., Shibuya, T., Hayakawa, T., Yokoyama, T.., ..., Gautam, I., Haba, M.K., ..., Masuda, Y., et al.
Late fluid flow in a primitive asteroid revealed by Lu-Hf isotopes in Ryugu.
Nature, 646, 62-67, 2025. DOI: 10.1038/s41586-025-09483-0
Masuda, Y., Yokoyama, T.、Iizuka, T., Hibiya, Y.
The origin of isotopic variations in chondritic materials revealed by the titanium and chromium isotopic analyses of refractory inclusions.
Earth and Planetary Science Letters, 664, 119447, 2025. DOI: 10.1016/j.epsl.2025.119447
Gattacceca, J., ..., Yokoyama, T.., Lopez Garcia, K., et al.
Oued Chebeika 002: A new CI1 meteorite linked to outer solar system bodies.
Meteoritics and Planetary Science, 60, 1441-1479, 2025. DOI: 10.1111/maps.14359
Zhu, K., Nakanishi, N., Render, J., Shollenberger, Q.R., Yokoyama, T..,Ishikawa, AL., Chen, L.
CY1 Chondrites Produced by Impact-Dehydration of the CI Chondrite Parent Body.
The Astrophysical Journal, 984, L54, 2025. DOI: 10.3847/2041-8213/adc89c
Gautam, I., Yokoyama, T..,Horan, M.F., Carlson, R.W.
Five-stage multielement separation procedure: A unique and essential tool for the multi-isotopic analyses of precious (< 30 mg) extraterrestrial materials.
Geochemical Journal, 59, 64-83, 2025. DOI: 10.2343/geochemj.GJ25003.
Yokoyama, T., Dauphas, N., Fukai, R., Usui, T., Tachibana, S., Schonbachler, M., Busemann, H., Abe, M., Yada, T.
The Elemental Abundances of Ryugu: Assessment of Chemical Heterogeneities and the Nugget Effect.
Geochemical Journal, 59, 45-63, 2025. DOI: 10.2343/geochemj.GJ25002.