Publications

• Torii Douglas-Song, Tsutomu Ota,  Masahiro Yamanaka, Hiroshi Kitagawa, Ryoji Tanaka, Christian Potiszil, Tak Kunihiro (2025) Lithium- and oxygen-isotope compositions of a Si-rich nebular reservoir determined from chondrule constituents in the Sahara 97103 EH3 chondrite. Geochimica et Cosmochimica Acta, doi.org/10.1016/j.gca.2025.05.038.

• Yash Srivastava, Amit Basu Sarbadhikari, Varsha M. Nair, Avadh Kumar, Yogita Kadlag, Ramakant R. Mahajan, Neeraj Srivastava, Neha Panwar, Aditya Das, Ryoji Tanaka, James M. D. Day, Anil D. Shukla, Dwijesh Ray, Abhishek J. Verma, Alka Rani, Garima Arora, Dipak K. Panda, S. Vijayan, Anil Bhardwaj  (2025) Petrogenesis of the Rantila meteorite fall and implications for the origin of aubrites , Meteoritics & Planetary Science,  https://doi.org/10.1111/maps.14357 

• Potiszil, C., Ota, T., Yamanaka, M.,  Kobayashi, K., Tanaka, R., & Nakamura, E. (2025) Meteoritic and asteroidal amino acid heterogeneity: Implications for planetesimal alteration conditions and sample return missions, Earth and Planetary Science Letters 2025 Vol. 653 Pages 119205,  https://doi.org/10.1016/j.epsl.2025.119205

• Tanaka, R., Ratnayake, M. D., Ota T., Miklusicak, N., Kunihiro, T., Potiszil, C., Sakaguchi, C., Kobayashi, K., Kitagawa, H., Yamanaka, M., Abe, M., Miyazaki, A., Nakato, A., Nakazawa, S., Nishimura, M., Okada, T., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Usui, T., Watanabe, S., Yada, T., Yogata, K., Yoshikawa, M., Nakamura, E. (2024) Unraveling the Cr Isotopes of Ryugu: An Accurate Aqueous Alteration Age and the Least Thermally Processed Solar System Material, The Astrophysical Journal, 965, 52. https://doi.org/10.3847/1538-4357/ad276a

• Potiszil, C., Yamanaka, M., Sakaguchi, C., Ota, T., Kitagawa, H., Kunihiro, T., Tanaka, R., Kobayashi, K., Nakamura, E. (2023) Organic Matter in the Asteroid Ryugu: What We Know So Far. Life  13, 1448. https://doi.org/10.3390/life13071448 

• Ota, T., Potiszil, C., Kobayashi, K., Tanaka, R., Kitagawa, H., Kunihiro, T., Sakaguchi, C., Yamanaka, M., Nakamura, E. (2023) The Formation of a Rubble Pile Asteroid: Insights from the Asteroid Ryugu, Universe 9, 293, doi:10.3390/universe9060293

• Potiszil, C., Ota, T., Yamanaka, M., Sakaguchi, C.,  Kobayashi, K., Tanaka, R., Kunihiro, T., Kitagawa , H., Abe, M., Miyazaki, A., Nakato, A., Nakazawa, S., Nishimura, M., Okada, T., Saiki, T., Tanaka, S., Terui, F., Tsuda, Y., Usui, T., Watanabe, S., Yada, T., Yogata, K., Yoshikawa, M., Nakamura, E. (2023) Insights into the formation and evolution of extraterrestrial amino acids from the asteroid Ryugu, Nat Commun., 14, 1482, doi:10.1038/s41467-023-37107-6

• Saavedra, M.E., Roszjar, J., Riebe, M.E.I., Varela, M.E., Yang, S., Humayun, M., Tanaka, R., Busemann, H. (2022) Malotas (b), a new eucrite from an old fall, Meteorit. Planet. Sci. 57, 2081-2101, doi: 10.1111/maps.13913

• Nakamura, E.,  Kobayashi, K., Tanaka, R., Kunihiro, T., Kitagawa, H., Potiszil, C., Ota T., Sakaguchi, C., Yamanaka, M., Ratnayake, M. D., Tripathi, H., Kumar, R., Avramescu, M. L., Tsuchida, H., Yachi, Y., Miura, H., Abe, M., Fukai, R., Furuya, S., Hatakeda, K., Hayashi, T., Hitomi, Y., Kumagai, Miyazaki, A., Nakato, A., Nishimura, M., Okada, T., Soejima, H., Sugita, S., Suzuki, A., Usui, T., Yada, T., Yamamoto, D., Yogata, K., Yoshitake, M., Arakawa, M., Fujii, A., Hayakawa, M., Hirata, N., Hirata, N., Honda, R., Honda, C., Hosoda, S., Iijima, Y., Ikeda, H., Ishiguro, M., Ishihara, Y., Iwata, T., Kawahara, K., Kikuchi, S., Kitazato, K., Matsumoto, K., Matsuoka, M., Michikami, T., Mimasu, Y., Miura, A., Morota, T., Nakazawa, S., Namiki, N., Noda, H., Noguchi, R., Ogawa, N., Ogawa, K., Okamoto, C., Ono, G., Ozaki, M., Saiki, T., Sakatani, N., Sawada, H., Senshu, H., Shimaki, Y., Shirai, K., Takei, Y., Takeuchi, H., Tanaka, S., Tatsumi, E., Terui, F., Tsukizaki, R., Wada, K., Yamada, M., Yamada, T., Yamamoto, Y., Yano, H., Yokota, Y., Yoshihara, K., Yoshikawa, M., Yoshikawa, K., Fujimoto, M., Watanabe, S., Tsuda, Y. (2022) On the origin and evolution of the asteroid Ryugu: A comprehensive geochemical perspective. Proceedings of the Japan Academy, Series B, 98, 227-282, doi: 10.2183/pjab.98.015

• Havishk, Potiszil, C., Tanaka, R., Nakamura, E. (2022) The ice-organic-silicate contents of small solar system bodies: indicators for a comet to asteroid evolutionary pathway.  Monthly Notices of the Royal Astronomical Society, 513, 3734-3741, 10.1093/mnras/stac1068

• Nikitczuk, M. P., Bebout, G. E., Ota, T., Kunihiro, T., Mustard, J. F.,  Flemming, R. L., Tanaka, R.,  Halldórsson, S. A., Nakamura, E. (2022) Nitrogenous Altered Volcanic Glasses as Targets for Mars Sample Return: Examples From Antarctica and Iceland. Journal of Geophysical Research Planets, 10.1029/2021JE007052

• Tanaka, R., Potiszil, C., & Nakamura, E. (2021) Silicon and oxygen isotope evolution of the inner solar system. The Planetary Science Journal, 2, 102, 10.3847/PSJ/abf490

• Potiszil, C., Tanaka, R., Kobayashi, K., Kunihiro, T. & Nakamura, E. (2020) The Albedo of Ryugu: Evidence for a High Organic Abundance, as Inferred from the Hayabusa2 Touchdown Maneuver, Astrobiology, 20(7), 916-921, doi:10.1089/ast.2019.2198

• Potiszil, C., Tanaka, R., Ota, T., Kunihiro, T., Kobayashi, K. & Nakamura, E. (2020) Concentration of meteoritic free organic matter by fluid transport and adsorption. Geochemical Perspectives Letters, 13, 30–35, doi:10.7185/geochemlet.2010

• Hibiya, Y, Archer, G.J., Tanaka, R., Sanborn, M.E., Sato, Y., Iizuka, T., Ozawa, K., Walker, R.J., Yamaguchi, A., Yin, Q-Z., Nakamura, T., Irving, A.J. (2019) The origin of the unique achondrite Northwest Africa 6704: Constraints from petrology, chemistry and Re–Os, O and Ti isotope systematics, Geochim. Cosmochim. Acta, 245, 597-627.

• Nakamura, E., Kunihiro, T., Ota, T., Sakaguchi, C., Tanaka, R., Kitagawa, H., Kobayashi, K., Yamanaka, M.,, Yuri Shimaki, Bebout, G.E.,, Miura, H., Yamamoto, T., Malkovets, V., Grokhovsky, V., Koroleva, O. and Litasov, K. (2019) Hypervelocity collision and water-rock interaction in space preserved in the Chelyabinsk ordinary chondrite, Proceedings of the Japan Academy Series B, 95(4), 165-177.

• Tanaka, R. & Nakamura, E. (2017) Silicate-SiO reaction in a protoplanetary disk recorded by oxygen isotopes in chondrules. Nature Astronomy, 1, 0137, doi: 10.1038/s41550-017-0137.

• Singerling, S. A., Modi, A. L., McFerrin, B., Worsham, E. A., McSween, H. Y. Jr., Rumble, D. III, Tanaka, R. & Taylor, L. A. (2013) Two new eucrite breccias from Northwest　Africa.　Meteoritics & Planetary Science, 48, E1–E9.

• Nakamura, E., Makishima, A., Moriguti, T., Kobayashi, K., Tanaka, R., Kunihiro, T., Tsujimori, T., Sakaguchi, C., Kitagawa, H., Ota, T., Yachi, Y., Yada, T., Abe, M., Fujimura, A., Ueno, M., Mukai, T., Yoshikawa, M. & Kawaguchi, J. (2012) Space environment of an asteroid preserved on micrograins returned by the Hayabusa spacecraft, PNAS Plus, 109 (11), E624-E629 & 4031-4032

Earth Science

Early Earth

• Ratnayake, D.M.*, Tanaka, R.* & Nakamura, E. (2025) Biogeochemical impact of nickel and urea in the great oxidation event. Commun Earth Environ 6, 654 (2025). 

https://doi.org/10.1038/s43247-025-02576-8

Mantle & Volcanics

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

• Feyissa, D.H., Kitagawa, H., Bizuneh, T.D., Tanaka, R., Kabeto, K., Nakamura, E. (2019) Transition from plume-driven to plate-driven magmatism in the evolution of the Main Ethiopian Rift, Journal of Petrology, 60, 1681-1715.

• Belay, I-G., Tanaka, R.*, Kitagawa, H., Kobayashi, K., Nakamura, E. (2019) Origin of ocean island basalts in the West African passive margin without mantle plume involvement, Nature Communications, 10, 3022.

• ​Tanaka, R., Yokoyama, T. Kitagawa, H. & Tesfaye, D. B., & Nakamura, E. (2015) Evaluation of the applicability for the 238U-230Th internal isochron method, Chemical Geology, 396, 255-264.

• Sakyi, P. A., Tanaka, R.*, Kobayashi, K. & Nakamura, E. (2012) Inherited Pb isotopic records in olivine antecryst-hosted melt inclusions from Hawaiian lavas. Geochimica et Cosmochimica Acta, 95, 169-105.

• Tanaka, R., Makishima, A. & Nakamura, E. (2008) Hawaiian double volcanic chain triggered by an episodic involvement of recycled material: Constraints from temporal Sr–Nd–Hf–Pb isotopic trend of the Loa-type volcano. Earth and Planetary Science Letters, 265, 450-465.

• Tanaka, R. & Nakamura, E. (2005) Boron isotopic constraints on the source of Hawaiian shield lavas. Geochimica et Cosmochimica Acta, 69, 3385-3399.

• Kobayashi, K., Tanaka, R., Moriguti, T., Shimizu, K. & Nakamura, E. (2004) Lithium, boron, and lead isotope systematics of glass inclusions in olivines from Hawaiian lavas: evidence for recycled components in the Hawaiian plume. Chemical Geology, 212,143-161.

• Tanaka, R., Nakamura, E. & Takahashi, E. (2002) Geochemical evolution of Koolau Volcano, Hawaii. in Hawaiian Volcanoes: Deep Underwater Perspectives, Geophysical Monograph. Ser., vol. 128, edited by E. Takahashi et al., pp. 311–332.

• Ishihara, S., Tanaka, R., Nakagawa, M. & Goto, Y. (1995) Magnetic susceptibility of late Cenozoic volcanic rocks of east-central Hokkaido and the Kuril Island. Resource Geology Special Issue, 18, 217-228. 

Crust

• Rehman, Ur. H., Tanaka, R., O’Brien, J.P., Kobayashi, K., Tsujimori, T., Nakamura, E., Yamamoto, H., Khan, T. & Kaneko, Y. (2014) Oxygen isotopes in Indian Plate eclogites (Kaghan Valley, Pakistan): Negative δ18O values from a high latitude protolith reset by Himalayan metamorphism, Lithos, 208-209, 471-483.

• Ishihara, S., Stein, H. J. & Tanaka, R. (2002) Re-Os age of molybdenite from the Busetsu two-mica granite, central Japan. Bulletin of the Geological Survey of Japan, 53, 479-482.

• Ishihara, S., Matsuhisa, Y., Tanaka, R., Ihara, H., Nagasaka, A., Koike, T. & Shibata, K. (1998) The timing and geneses of ilmenite-series and magnetite-series granitic magmatism in the north-central Hokkaido, Japan. Bulletin of the Geological Survey of Japan, 49, 605-620.

• ​Qin, K. Z., Tanaka, R., Li, W. S. & Ishihara, S. (1998) The discovery of Indo-Sinian granites in Manchzhouli area: Evidence from Rb-Sr isochrons. Acta Petrologica et Mineralogica, 17, 235-240. 

Hydrothermal system

• Zakharov, D. O., Tanaka, R., Butterfield, D. A., & Nakamura, E. (2021) A New Insight Into Seawater-Basalt Exchange Reactions Based on Combined δ18O—Δ′17O—87Sr/86Sr Values of Hydrothermal Fluids From the Axial Seamount Volcano, Pacific Ocean, Frontiers in Earth Science, 9, 691699, doi:10.3389/feart.2021.691699

• ​Zakharov, D.O., Bindeman, I.N., Tanaka, R., Friðleifsson, G.Ó, Reed, M., Hampton, R.L., (2019) Triple oxygen isotope systematics as a tracer of fluids in the crust: A study from modern geothermal systems of Iceland., Chemical Geology, 530, 119312.​

• Ota, T., Aihara, Y., Kiyokawa, S., Tanaka, R., Nakamura, E. (2019) Tourmaline in a Mesoarchean pelagic hydrothermal system: Implications for the habitat of early life., Precambrian Research, 334, 105475.

• Ishihara, S., Sasaki, A., Minagawa, T., Bunno, M., Shishido, A. & Tanaka, R., (2000) Paired sulfur isotopic belts: late Cenozoic ore deposits of Southwest Japan. Bulletin of the Geological Survey of Japan, 51, 283-297.

• Nanbu, A., Hamano, K., Tanaka, R. & Ishihara, S. (1997) Chemical and mineralogical characteristics of the Kanamaru pegmatite deposit, Niigata prefecture, Japan. Resource Geology, 47, 1-10. 

Soil Science

• Kitagawa, Y., Nakao, A., Tanaka, R., Takeda, A., Yamada, D., Evrard, O., & Yanai, J. (2024). Relative importance of Asian-dust-derived micas estimated from oxygen isotopic analysis of fine quartz on specific retention of radiocesium in Andosols in Tohoku Region, Japan. Soil Science and Plant Nutrition, 1–12. doi: 10.1080/00380768.2024.2387732

• Nakao, A., Uno, S., Tanaka, R. and Yanai, J. (2022) Mineralogical Factors Controlling the Ability to Retain 137Cs in Andosols in Japan, In: Behavior of Radionuclides in the Environment III: Fukushima, edited by K. Nanba, A. Konoplev and T. Wada, Springer Singapore, doi:10.1007/978-981-16-6799-2_16

• Nakao, A., Uno, S., Yanai, J., Kubotera, H., Tanaka, R., Root, R. A., Kosaki, T., (2021) Distance-dependence from volcano for Asian dust inclusions in Andosols: A key to control soil ability to retain radiocesium, Geoderma, 385(1), 114889, doi:10.1016/j.geoderma.2020.

• Nakao, A., Tomita, M., Wagai, R., Tanaka, R., Yanai, J., Kosaki, T. (2019) Asian dust increases radiocesium retention ability of serpentine soils in Japan. Journal of Environmental Radioactivity, 204, 86-94.

• ​Nakao, A., Nakao, A., Tanaka, R., Ogasawasra, S. & Yanai, J. (2015) Aeolian-Dust-Derived Micaceous Minerals Control Radiocesium Retention in Andosols in Japan, Soil Science Society of America Journal, 79, 1590-1600.

• Eguchi, T., Tanaka, R., Maejima, Y. & Tamura, K. (2012) The influence of Aeolian dust in non-allophanic Andosols on Yakushima Island. Soil Science and Plant Nutrition. 58, 191-199. 

Analytical and Applied Chemistry

Applied Chemistry

• Ching, K., Baker, A., Tanaka, R., Zhao, T., Su, Z., Ruoff, R. S., Zhao, C., & Chen, X. (2022) Liquid-phase water isotope separation using graphene-oxide membranes, Carbon, 186, 344-354, doi:10.1016/j.carbon.2021.10.009. 

Analytical Chemistry

• ​Ratnayake, D. M., Tanaka, R., & Nakamura, E. (2023) 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 Pages 341723 , doi:10.1016/j.aca.2023.341723, https://authors.elsevier.com/c/1hc8AlYfllQZ 

• Zhang, W., Tanaka, R., Kitagawa, H., Bohlin, M., Nakamura, E. (2022) A rapid method for simultaneous chromatographic purification of Li and Mg for isotopic analyses using MC-ICP-MS, International Journal of Mass Spectrometry, 480, 116893, doi.org/10.1016/j.ijms.2022.116893

• Ratnayake, D. M., Tanaka, R., & Nakamura, E. (2021) Novel nickel isolation procedure for a wide range of sample matrices without using dimethylglyoxime for isotope measurements using MC-ICP-MS, Analytica Chimica Acta, 1181, 338934, doi:10.1016/j.aca.2021.338934,

• Miller, M., Tanaka, R. & Greenwood, R. (2020) Comment on: ‘A simple cryogenic method for efficient measurement of triple oxygen isotopes in silicates’ by Ghoshmaulik et al., Rapid Communications in Mass Spectrometry, 34(22), e8913, doi:10.1002/rcm.8913,

• Zhou, X., Tanaka, R., Yamanaka, M., Sakaguchi, C., Nakamura, E. (2019) A Method to Suppress Isobaric and Polyatomic Interferences for Measurements of Highly Siderophile Elements in Desilicified Geological Samples, Geostandards and Geoanalytical Research, 43, 611-633.

• Pack, A., Tanaka, R., Hering, M., Sengupta, S., Peters, S. & Nakamura, E. (2016) The oxygen isotope composition of San Carlos olivine on the VSMOW2-SLAP2 scale. Rapid Communications in Mass Spectrometry, 30, 1495-1504.

• Tanaka, R. & Nakamura, E. (2013) Determination of 17O-excess of terrestrial silicate/oxide minerals with respect to Vienna Standard Mean Ocean Water (VSMOW). Rapid Communications in Mass Spectrometry, 27, 285-297. 

• Nakamura, E., Mikishima, A., Moriguti, T., Kobayashi, K., Tanaka, R., Kunihiro, T., Tsujimori, T. (2012) Establishment of comprehensive analytical system for terrestrial and extraterrestrial materials behind the initial analysis of particles returned by Hayabusa spacecraft. Journal of the Surface Science Society of Japan, 33, 681-686 (in Japanese with English abstract).

• Makishima, A., Tanaka, R. & Nakamura, E. (2009) Precise Elemental and Isotopic Analyses in Silicate Samples Employing ICP-MS: Application of Hydrofluoric Acid Solution and Analytical Techniques. Analytical Sciences, 25, 1181-1187.

• Nath, N., Makishima, A., Noordmann, J., Tanaka, R. & Nakamura, E. (2009) Comprehensive analysis for major, minor and trace element contents and Sr–Nd–Pb–Hf isotope ratios in sediment reference materials, JSd-1 and MAG-1. Geochemical Journal, 43, 207-216.

• Tanaka, R., Makishima, A., Kitagawa, H. & Nakamura, E. (2003) Suppression of Zr, Nb, Hf and Ta coprecipitation in fluoride compounds for determination in Ca-rich materials. Journal of Analytical Atomic Spectrometry, 18, 1458-1463. doi: 10.1039/B309948B

• Nakamura, E., Makishima, A., Moriguti, T., Kobayashi, K., Sakaguchi, C., Yokoyama, T., Tanaka, R., Kuritani, T., Takei, H. (2013) Comprehensive geochemical analyses of small amounts (<100mg) of extraterrestrial samples for the analytical competition related to the sample return mission MUSES-C. Insti. Space Astronaut. Sci. Rep. SP, 16, 49-101.

• Orihashi, Y., Maeda, J., Tanaka, R., Zeniya, R. & Niida, K. (1998) Sr and Nd isotopic data for the seven GSJ rock reference samples; JA-1, JB-1a, JB-2, JB-3, JG-1a, JGb-1 and JR-1. Geochemical Journal, 32, 205-211.

• Tanaka, R. & Orihashi, Y. (1997) XRF analysis of major and trace elements for silicate rocks using low dilution ratio fused glass. HUEPS Technical Report, Hokkaido University, 2, 1-20. 

Non-reviewed paper

• Tanaka, Y., Tanaka, R., Itami, A. & O'Neil, A. (1997) Sondeos subterráneos sin excavacíon en El Salvador. Antología de Chalchuapa. Edited by Ohi, K. Universidad de Estudios Extranjeros de Kyoto. 36-50 (in Spanish).

• Tanaka, R. (2000) Characteristics of igneous activity during the highest metamorphic stage of Ryoke belt, Gekkan Chikyu, 30, 64-69 (in Japanese).

Patent

•  Tanaka, R., Kitagawa, H., Makishima, A., Nakamura, E.（2005）Analytical technique of trace elements in the sample, method for suppression of fluoride-coprecipitation of trace elements（Patent No. 3755039)