Our goal is to describe atoms that represent element distribution of the Solar system that are continuously evolving from the beginning to the future. To understand the Solar system with spatial scale 1013 m, we analyze planetary materials that are from different origin with different processes, and determine element and isotope compositions with spatial resolution down to 10-9 m.

Planetary materials besides terrestrial ones are the rolling stones that are sampled with locality unknown. To fill the important missing information, we developed a protocol that is to determine multiple-elements, multiple-isotopes, and multiple-phases. We referred the approach to be 'comprehensive' and construct an analytical system that let us do so. The system acts as a gigantic machine with numerous instruments glued by analytical methods and disciplined people. The disciplines and samples would be taken over to the next generation to sustain our science.

We work as a team and prefer arguments scientifically.


Hayabusa 2 landed on the C-type asteroid Ryugu

February 22, 2019

JAXA announced that Hayabusa 2 successful launched a projectile into asteroidal surface. We are pleased to hear it and also infer that we do our best to analyze the samples collected by the spacecraft as `phase-2 curation' facilities.

Don't you want to analyze the samples using our CASTEM analytical system with us? If you want, please join us as a graduate student!! ...more information!


Kunihiro, T., Ota, T., Nakamura, E., Lithium- and oxygen-isotope compositions of chondrule constituents in the Allende meteorite, Geochimica et Cosmochimica Acta, 252, 2019.

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Hoang, Q. D., Kunihiro, T., Sakaguchi, C., Yamanaka, M., Kitagawa, H., Nakamura, E., Determination of abundances of fifty-two elements in natural waters by ICP-MS with freeze-drying pre-concentration, Geostand. Geoanal. Res., 10.1111/ggr.12245, 2018.

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Ranaweera, L.V., Ota, T., Moriguti, T., Tanaka, R., and Nakamura, E., Circa 1 Ga sub-seafloor hydrothermal alteration imprinted on the Horoman peridotite massif, Scientific Reports, 8 art. 9887, 2018.

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Pineda-Velasco, I., Kitagawa, H., Nguyen, T.T., Kobayashi, K., Nakamura, E., Production of High-Sr Andesite and Dacite Magmas by Melting of Subducting Oceanic Lithosphere at Propagating Slab Tears, J. Gepphys. Res. Solid. Earth, 123 (5), 3698-3728, 2018.

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Mar. 19, 10:00 AM in 3F Seminar Room
Seminar by Kucukarsklan Nurcan

Mar. 13, 10:00 AM in 3F Seminar Room
Seminar by Li Wei (grad. student, China Univ. Geosciences)

Mar. 12, 10:00 AM in 3F Seminar Room
Seminar by Hajime Taniuchi (Hokkaido Univ.)

Feb. 26, 10:00 AM in 3F Seminar Room
Seminar by Yanqing Li

Feb. 19, 10:00 AM in 3F Seminar Room
Seminar by Nhgiem Van Dao