Masafumi Saitoh
Project researcher
The University Museum, The University of Tokyo
Geology, Isotope geochemistry, and Archaeological science
Hongo 7-3-1, Tokyo 113-0033, Japan
Mail: msaitoh_at_um.u-tokyo.ac.jp (_at_ => @)
Research
I am interested in the coevolution of the Earth and life and in the oceanic biogeochemical cycle in Earth's history. I have studied the environmental changes related to the end-Permian mass extinction. My current research interests are the fluid-rock interactions in seafloor hydrothermal systems in the modern oceans and the evolution of the C-N-S cycles in the Precambrian ocean/atmosphere system.
Publications
26. Saitoh, M., Nishizawa, M., Ozaki, K., Ikeda, M., Ueno, Y., Takai, K., Isozaki, Y. (2023) Nitrogen isotope record from a mid-oceanic paleo-atoll limestone to constrain the redox state of the Panthalassa ocean in the Capitanian (Late Guadalupian, Permian). Paleoceanography and Paleoclimatology, 38, e2022PA004573; doi:10.1029/2022PA004573. Open Access
25. Saitoh, M., Olivier, N., Garçon, M., Boyet, M., Thomazo, C., Alleon, J., Moyen, J-.F., Motto-Ros, V., Marin-Carbonne, J. (2022) Reply to comment on "Metamorphic origin of anastomosing and wavy laminas overprinting putative microbial deposits from the 3.22 Ga Moodies Group (Barberton Greenstone Belt)". Precambrian Research, 373, 106624.
24. Saitoh, M. (2021) Multiple sulfur isotope geochemistry during the Permian-Triassic transition. Geosciences, 11, 327; doi:10.3390/geosciences11080327. Open Access
23. Saitoh, M., Olivier, N., Garçon, M., Boyet, M., Thomazo, C., Alleon, J., Moyen, J-.F., Motto-Ros, V., Marin-Carbonne, J. (2021) Metamorphic origin of anastomosing and wavy laminas overprinting putative microbial deposits from the 3.22 Ga Moodies Group (Barberton Greenstone Belt). Precambrian Research, 362, 106306. Open Access
22. Saitoh, M., Ueno, Y., Isozaki, Y., Yoshida, N. (2021) Multiple sulfur isotope chemostratigraphy across the Permian-Triassic boundary at Chaotian, China: Implications for a shoaling model of toxic deep-waters. Island Arc, 30:e12398.
21. Saitoh, M., Isozaki, Y. (2021) Carbon isotope chemostratigraphy across the Permian-Triassic boundary at Chaotian, China: Implications for the global methane cycle in the aftermath of the extinction. Frontiers in Earth Science, 8:596178. Open Access
20. Matsu’ura, F., Nakada, R., Usui, T., Sawaki, Y., Ueno, Y., Kajitani, Y., Saitoh, M. (2021) Spatial distribution and speciation of sulfur in Ediacaran limestones with l-XRF imaging and XANES spectroscopy: Implications for diagenetic mobilization of sulfur species. Geochimica et Cosmochimica Acta, 306, 20–43.
19. Nishizawa, M., Saito, T., Makabe, A., Ueda, H., Saitoh, M., Shibuya, T., Takai, K. (2021) Stable abiotic production of ammonia from nitrate in komatiite‐hosted hydrothermal systems in the Hadean and Archean oceans. Minerals, 11, 321.
18. Nozaki, T., Nagase, T., Ushikubo, T., Shimizu, K., Ishibashi, J., D/V Chikyu Expedition 909 Scientists. (2021) Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization. Geology, 49, 222-227. Open Access
17. Nozaki*, T., Nagase, T., Takaya, Y., Yamasaki, T., Otake, T., Yonezu, K., Ikehata, K., Totsuka, S., Kitada, K., Sanada, Y., Yamada, Y., Ishibashi, J., Kumagai, H., Maeda, L., D/V Chikyu Expedition 909 Scientists. (2021) Subseafloor sulphide deposit formed by pumice replacement mineralization. Scientific Reports, 11:8809.
16. Saitoh, M., Nabhan, S., Thomazo, C., Olivier, N., Moyen, J-.F, Ueno, Y., Marin-Carbonne, J. (2020) Multiple sulfur isotope records of the 3.22 Ga Moodies Group, Barberton Greenstone Belt. Geosciences, 10,145; doi:10.3390/geosciences10040145. Open Access
15. Nozaki, T., Nagase, T., Torimoto, J., Takaya, Y., Ishibashi, J., Shimada, K., Watanabe, M., Masaki, Y., Iijima, K., Kitada, K., Saitoh, M., Yokoyama, T., Akiyama, K., Sakurai, N., Saruhashi, T., Kyo, M., Kumagai, H., Maeda, L. (2020) Formation of highly Zn-enriched sulfide scale at a deep-sea artificial hydrothermal vent, Iheya-North Knoll, Okinawa Trough. Mineralium Deposita, https://doi.org/10.1007/s00126-020-01022-3.
14. Usui, Y., Saitoh, M., Tani, K., Nishizawa, M., Shibuya, T., Kato, C., Okumura, T., Kashiwabara, T. (2020) Identification of paleomagnetic remanence carriers in ca. 3.47 Ga dacite from the Duffer Formation, the Pilbara Craton. Physics of the Earth and Planetary Interiors, 299, 106411.
13. Takahagi, W., Seo, K., Shibuya, T., Takano, Y., Fujishima, K., Saitoh, M., Shimamura, S., Matsui, Y., Tomita, M., Takai, K. (2019) Peptide synthesis under the alkaline hydrothermal conditions on Enceladus. ACS Earth and Space Chemistry, 3, 11, 2559-2568.
12. Saitoh, M., Ueno, Y., Matsu’ura, F., Kawamura, T., Isozaki, Y., Yao, J.X., Ji, Z.S., Yoshida, N. (2017) Multiple sulfur isotope records at the end-Guadalupian (Permian) at Chaotian, China: Implications for a role of bioturbation in the Phanerozoic sulfur cycle. Journal of Asian Earth Sciences, 135, 70-79.
11. Usui, Y., Yamazaki, T., Saitoh, M. (2017) Changing Abundance of Magnetofossil Morphologies in Pelagic Red Clay Around Minamitorishima, Western North Pacific. Geochemistry, Geophysics, Geosystems, 18, doi:10.1002/2017GC007127.
10. Nishizawa, M., Saitoh, M., Matsui, Y., Usui, Y., Shibuya, T. (2017) Removal of organic contaminants from iron sulfide as a pretreatment for FeS- mediated chemical synthesis under prebiotic hydrothermal conditions. Geochemical Journal, 51, doi:10.2343/geochemj.2.0481.
9. Ueda, H., Shibuya, T., Sawaki, Y., Saitoh, M., Takai, K., Maruyama, S. (2016) Reactions between komatiite and CO2-rich seawater at 250 and 350 °C, 500 bars: implications for hydrogen generation in the Hadean seafloor hydrothermal system. Progress in Earth and Planetary Science, 3:35, doi:10.1186/s40645-016-0111-8. Open Access
8. Saitoh, M., Ueno, Y., Isozaki, Y., Shibuya, T., Yao, J.X., Ji, Z.S., Shozugawa, K., Matsuo, M., Yoshida, N. (2015) Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans. Progress in Earth and Planetary Science, 2:41, doi:10.1186/s40645-015-0073-2. Open Access
7. Shimizu, K., Suzuki, K., Saitoh, M., Konno, U., Kawagucci, S., Ueno, Y. (2015) Simultaneous determinations of fluorine, chlorine, and sulfur in rock samples by ion chromatography combined with pyrohydrolysis. Geochemical Journal, 49, doi:10.2343/geochemj.2.0338.
6. Saitoh, M., Ueno, Y., Isozaki, Y., Nishizawa, M., Shozugawa, K., Kawamura, T., Yao, J.X., Ji, Z.S., Takai, K., Yoshida, N., Matsuo, M. (2014) Isotopic evidence for water-column denitrification and sulfate reduction at the end-Guadalupian (Middle Permian). Global and Planetary Change, 123, 110–120.
5. Saitoh, M., Ueno, Y., Nishizawa, M., Isozaki, Y., Takai, K., Yao, J.X., Ji, Z.S. (2014) Nitrogen isotope chemostratigraphy across the Permian–Triassic boundary at Chaotian, Sichuan, South China. Journal of Asian Earth Sciences, 93, 113–128.
4. Saitoh, M., Isozaki, Y., Ueno, Y., Yoshida, N., Yao, J.X., Ji, Z.S. (2013) Middle-Upper Permian carbon isotope stratigraphy at Chaotian, South China: Pre-extinction multiple upwelling of oxygen-depleted water onto continental shelf. Journal of Asian Earth Sciences, 67–68, 51–62.
3. Saitoh, M., Isozaki, Y., Yao, J.X., Ji, Z.S., Ueno, Y., Yoshida, N. (2013) The appearance of an oxygen-depleted condition on the Capitanian disphotic slope/basin in South China: Middle-Upper Permian stratigraphy at Chaotian in northern Sichuan. Global and Planetary Change, 105, 180–192.
2. Saitoh, M., Isozaki, Y., Yao, J.X., Ji, Z.S. (2010) Lithostratigraphy of Upper Guadalupian (Middle Permian) rocks at Chaotian in Sichuan, South China: Secular change in sea level and redox condition of the sedimentary environment. Journal of Geological Society of Japan, 116, 388–399 (in Japanese).
1. Isozaki, Y., Yao, J.X., Ji, Z.S., Saitoh, M., Kobayashi, N., Sakai, H. (2008) Rapid sea-level change in the Late Guadalupian (Permian) on the Tethyan side of South China: litho- and biostratigraphy of the Chaotian section in Sichuan. Proceeding of Japan Academy, Series B 84, 344–353.
Links
Sch. of Geosci. & Civil Eng., Kanazawa Univ.
R&D Center for Submarine Resources, JAMSTEC