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.


On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective


A team of scientists undertake a comprehensive analysis of samples returned from the Japan Aerospace Exploration Agency’s Hayabusa2 mission and provide invaluable insights into the formation and evolution of our solar system. [ ... Read More ... 続きを読む ]



Ryoji Tanaka, Dilan M. Ratnayake, Tsutomu Ota, Noah Miklusicak, Tak Kunihiro, Christian Potiszil, Chie Sakaguchi, Katsura Kobayashi, Hiroshi Kitagawa, Masahiro Yamanaka et al . Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material, The Astrophysical Journal, 965(1), 52 (2024).

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Dilan M. Ratnayake, Ryoji Tanaka and Eizo Nakamura. Determination of mass-dependent chromium isotopic compositions in geological samples by double spike-total evaporation-thermal ionization mass spectrometry (DS-TE-TIMS), Analytica Chimica Acta, 1278, 341723 (2023).

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Maya-Liliana Avramescu, Christian Potiszil, Tak Kunihiro, Kazunori Okabe, and Eizo Nakamura. An investigation of the internal morphology of asbestos ferruginous bodies: constraining their role in the onset of malignant mesothelioma, Particle and Fibre Toxicology, 20, 19 (2023).

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Wei Zhang, Hiroshi Kitagawa, and Eizo Nakamura. Lithium Isotope Constraints on Slab and Mantle Contribution to Arc Magmas, Journal of Geophysical Research: Solid Earth, 128 (5), e2022JB025670 (2023).

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Christian Potiszil, Tsutomu Ota, Masahiro Yamanaka, Chie Sakaguchi, Katsura Kobayashi, Ryoji Tanaka, Tak Kunihiro, Hiroshi Kitagaw, Masanao Abe, Akiko Miyazaki, Aiko Nakato, Satoru Nakazawa, Masahiro Nishimura, Tatsuaki Okada, Takanao Saiki, Satoshi Tanaka, Fuyuto Terui, Yuichi Tsuda, Tomohiro Usui, Sei-ichiro Watanabe, Toru Yada, Kasumi Yogata, Makoto Yoshikawa and Eizo Nakamura. Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu, Nat Commun. 14, 1482 (2023).

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February 21, 10:00 AM in 3F Seminar Room
Interim defence presentation by Noah Miklusicak

February 9, 13:30 in 3F Seminar Room
PhD defence presentation by Dilan M. Ratnayake

January 31, 10:00 AM in 3F Tea Room
Seminar by Alebachew Tareke Kehali (The United Graduate School of Agricultural Sciences, Tottori University)

January 23, 10:00 AM in 3F Seminar Room
Seminar by Adam Greig Corbett

January 16, 10:00 AM in 3F Seminar Room
Seminar by Torii Douglas-Song

October 17, 10:00 AM in 3F Seminar Room
Seminar by Dr. Eloïse Céline Brown

September 19, 10:00 AM in 3F Seminar Room
Seminar by Ema Nersezova (Research Assistant, The University of Auckland)

September 15, 13:30 AM in 3F Seminar Room
Seminar by Prof. Michael Rowe (University of Auckland, School of Environment, New Zealand)

June 27, 10:00 AM in 3F Seminar Room
Seminar by Rahul Kumar

June 22, 10:00 AM in 3F Seminar Room
Seminar by Dr Ashlea Wainwright (Assistant Lab Manager Isotope Geochemistry Group, School of Earth Sciences , The University of Melbourne)

June 20, 10:00 AM in 3F Seminar Room
Seminar by Dilan M. Ratnayake