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.


Unravelling the chemical evolution of terrestrial planets in the early solar system: evidence from the isotopic composition of silicon and oxygen, which make up half of the Earth's mass


Terrestrial planets in our solar system formed in the protoplanetary disk about 4.6 billion years ago. As the disk cooled, planetesimals and planetary embryos formed, and they repeatedly collided and grew, eventually forming terrestrial planets. Since primitive meteorites contain primitive dust and fragments of planetesimals, analysis of these materials can provide direct information on the formation process of terrestrial planets..

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Tak Kunihiro, Tsutomu Ota, Masahiro Yamanaka, Potiszil Christian, Nakamura, Eizo. The trace element composition of chondrule constituents: Implications for sample return methodologies and the chondrule silicate reservoir, Meteoritics and Planetary Science (2021).

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Tanaka Ryoji, Potiszil Christian, Nakamura, Eizo. Silicon and Oxygen Isotope Evolution of the Inner Solar System, The Planetary Science Journal (2021).

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Hongda Hao, Ian H. Campbell, David R. Cooke, Eizo Nakamura, Chie Sakaguchi, Geochronology, Petrogenesis and Oxidation State of the Northparkes Igneous Suite, New South Wales, Australia: Implications for Magma Fertility, Economic Geology, (2021).

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Mar. 16, 10:00 AM in 3F Seminar Room
Seminar by Nurcan Kucukarslan

Feb. 9, 10:00 AM in 3F Seminar Room
Seminar by Dr. Yunchao Shu

Feb. 2, 10:00 AM in 3F Seminar Room
Seminar by Zhang Wei

Jan. 12, 4:00 PM in 3F Seminar Room
Seminar by Dilan Madusanka Ratnayake

Dec. 8, 10:00 AM in 3F Seminar Room
Seminar by Rahar Kumar

Nov. 19, 10:00 AM in 3F Seminar Room
Seminar by Havishk Tripathi

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