Yokoyama Laboratory investigates origin and evolution of the early solar system materials by isotopic and elemental analysis of terrestrial and extraterrestrial mateterials.
● NEWS
11/01/2025 Dr. Nao Nakanishi has joined our group as an assistant professor.
● RECENT TOPICS
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.
Masuda, Y., Schiller, M., Bizzarro, M., Yokoyama, T.
Calcium isotope evidence for the formation of early condensates in the Solar System from unmixed reservoirs with distinct nucleosynthetic origins.
Geochimica et Cosmochimica Acta, 388, 1-17, 2025.
Schonbachler, M., Fehr, M., Yokoyama, T., Gautam, I., Nakanishi, N., Haba, M.K., …, Masuda, Y., et al.
Zirconium isotope composition indicate s-process depletion in samples returned from asteroid Ryugu.
Meteoritics and Planetary Science, 60, 3-16, 2025.