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.


We suggest that a rubble pile asteroid (Itokawa, Ryugu, or Bennu) was turned from a comet


On the 15th February (2013), a meteorite impacted Chelyabinsk state in Russia (see YouTube). It is referred to as the Chelyabinsk meteorite and was categorized as an ordinary chondrite. It has a genetic relationship to the asteroid Itokawa, which is also composed from fragments of ordinary chondrite.

We have applied our comprehensive analyses to the Chelyabinsk meteorite. ... Read More ... 続きを読む


Potiszil, C., Tanaka, R., Ota, T., Kunihiro, T., Kobayashi, K., Nakamura, E., Concentration of meteoritic free organic matter by fluid transport and adsorption, Geochemical Perspective Letters, 2020.

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Zakharov, D.O., Bindeman, I.N., Tanaka, R., Friðleifsson, G.Ó, Reed, M., Hampton, R.L., Triple oxygen isotope systematics as a tracer of fluids in the crust: A study from modern geothermal systems of Iceland., Chemical Geology, 2019.

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Ota, T., Aihara, Y., Kiyokawa, S., Tanaka, R., Nakamura, E., Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life., Precambrian Research, 2019.

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Feyissa, D.H., Kitagawa, H., Bizuneh, T.D., Tanaka, R., Kabeto, K., Nakamura, E., Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift, Journal of Petrology, 2019.

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2019 - 2020

Apr. 21, 10:00 AM in 3F Seminar Room
Seminar by Nurcan Kucukarslan

Apr. 14, 10:00 AM in 3F Seminar Room
Seminar by Maya-Liliana Avramescu

Mar. 31, 10:00 AM in 3F Seminar Room
Seminar by Christian Potiszil

Feb. 25, 10:00 AM in 3F Seminar Room
Seminar by Nghiem Van Dao

Feb. 4, 10:00 AM in 3F Seminar Room
Seminar by Tulibako Tulibonwya

Jan. 28, 10:00 AM in 3F Seminar Room
Seminar by Alexandra Zetterlind

Dec. 24, 10:00 AM in 3F Seminar Room
Seminar by Wei Zhang

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

Nov. 26, 10:00 AM in 3F Seminar Room
Seminar by Dilan Ratnayake