Studying Chemistry in Okinawa!CurriculumFaculty

Tomohiro Toki

1. Hydrothermal system, Cold seep, Natural gas, Gas hydrate

2. Name : Tomohiro Toki

3. E-mail : toki@sci.u-ryukyu.ac.jp

4. Phone : +81-98-895-8537

5. Facsimile : +81-98-895-8565

6. Website : http://www.cc.u-ryukyu.ac.jp/~toki/index-e.html

7. Education :

1999: Graduated from Department of Chemistry School of Science, The University of Tokyo

2001: Graduated from Graduate School of Science, The University of Tokyo

2004: Ph.D. Graduate School of Science, Hokkaido University

2004-2006: Post-doctoral fellow, Ocean Research Institute, The University of Tokyo

2006-2006: Post-doctoral fellow, Center for Advanced Marine Core Research, Kochi University

2006-2007: Assistant; Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus

2007-2015: Assistant Professor; Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus

2015-present: Associate Professor; Department of Chemistry, Biology, and Marine Science, Faculty of Science, University of the Ryukyus

8. Research Interests :

Cold seeping mechanism

Geochemistry of hydrothermal system

Origin of natural gas

Formation of gas hydrates

9. Publications

  1. Tomhoiro Toki, Jun-ichiro Ishibashi, Yuji Ohnishi, Toshiro Yamanaka, Kanako Yoshida, and Lena Maeda: Application of an automatic analyzer to onboard analysis of nitrate concentration in a reductive fluid, Bulletin of the Society of Sea Water Science, Japan, Accepted
  2. Tomohiro Toki, Kiichiro Kawamura, Urumu Tsunogai, and Toshitaka Gamo: Microbial metabolism inferred from chemical and isotopic compositions of pore water around bananas discovered on the deep-sea floor in the Tenryu Submarine Canyon, JAMSTEC Report of Research and Development, v. 25, 1-12, 2017
  3. Tomohiro Toki, Daigo Iwata, Urumu Tsunogai, Daisuke D. Komatsu, Yuji Sano, Naoto Takahata, Hiroshi Hamasaki, Jun-ichiro Ishibashi: Formation of gas discharging from Taketomi submarine hot spring off Ishigaki Island in the southern Ryukyu Islands, Japan, Journal of Volcanology and Geothermal Research, v. 330, 24-35, 2017
  4. Tomohiro Toki, Masataka Kinoshita, Sumito Morita, Harue Masuda, Harunur Rashid, Haruka Yoshinishi, Takanori Nakano, and Takashi Noguchi: The vertical chloride ion profile at the IODP Site C0002, Kumano Basin, off coast of Japan, Tectonophysics, v. 710, 88-96, 2017
  5. Tomohiro Toki, Arito Hamamoto, Miki Tawata, Junichi Miyazaki, Kentaro Nakamura, Mariko Abe, Ken Takai, Yuji Sano, Naoto Takahata, Urumu Tsunogai, and Jun-ichiro Ishibashi: Methanogens in H2-rich hydrothermal fluids resulting from phase separation in a sediment-starved, basalt-hosted hydrothermal system, Chemical Geology, v. 447, 208-218, 2016
  6. Tomohiro Toki, Michihiro Itoh, Daigo Iwata, Shogo Ohshima, Ryuichi Shinjo, Jun-ichiro Ishibashi, Urumu Tsunogai, Naoto Takahata, Yuji Sano, Toshiro Yamanaka, Akira Ijiri, Nobuaki Okabe, Toshitaka Gamo, Yasuyuki Muramatsu, Yuichiro Ueno, Shinsuke Kawagucci, and Ken Takai: Geochemical characteristics of hydrothermal fluids at Hatoma Knoll in the southern Okinawa Trough, Geochemical Journal, v. 50, 493-525, 2016
  7. Tomohiro Toki, Kota Higa, and Ruichi Shinjo: Data report: boron isotope ratios in interstitial waters from Sites C0021 and C0022.C0022. In Strasser, M., Dugan, B., Kanagawa, K., Moore, G.F., Toczko, S., Maeda, L., and the Expedition 338 Scientists, Proceedings of the Integrated Ocean Drilling Program, 338: Yokohama (Integrated Ocean Drilling Program). doi:10.2204/iodp.proc.338.203.2015
  8. Tomohiro Toki, Harue Masuda, Harunur Rashid, Sebastian Hammerschmidt, and Ruichi Shinjo: Development of a new method of extraction of interstitial water from low-porosity consolidated sediments recovered during super-deep drilling projects. Geostandards and Geoanalytical Research, v.40(2), 291-300, 2015
  9. Tomohiro Toki, Sawako Heshiki, and Ryuichi Shinjo: Improved method for seawater lithium isotopic ratio determination using MC-ICP-MS, Bulletin of the Society of Sea Water Science, Japan, v.69, 326-331, 2015
  10. Tomohiro Toki, Jun-ichiro Ishibashi, Takuroh Noguchi, Miki Tawata, Urumu Tsunogai, Kentaro Nakamaura, Chemical and isotopic compositions of hydrothermal fluids at Snail, Archaean, Pika, and Urashima sites in the southern Mariana Trough, In: Subseafloor Biosphere Linked to Global Hydrothermal Systems; TAIGA Concept, Kyoko Okino, Jun-ichiro Ishibashi and Michinari Sunamura (eds.), Springer, Tokyo Heidelberg New York Dordrecht London, pp. 587-602, 2015
  11. Tomohiro Toki, Ryosaku Higa, Akira Ijiri, Urumu Tsunogai, and Juichiro Ashi: Sources of seepage fluids and the distribution and migration of pore fluids inferred from the chemical and isotopic compositions of pore water from sediment of cold seep sites off Kumano, EPS, v.66, 137, 2014
  12. Tomohiro Toki, Ryosaku Higa, Akira Tanahara, Akira Ijiri, Urumu Tsunogai, Juichiri Ashi: Origin of pore water in Kumano mud volcanoes,Chikyukagaku,v.47(4), 221-236, 2013
  13. Tomohiro Toki: Distribution of crustal fluids mainly composed by methane around the Ryukyu Islands and its relationship with geological settings, Chikyukagaku, v.47(2), 53-69, 2013
  14. Tomohiro Toki, Ryutaro Honda, Kazuki Oomine, Urumu Tsunogai, Daisuke D. Komatsu, Yuji Sano, Naoto Takahata, Masataka Kinoshita, Hideyuki Yamashiro: The origin of seeping gas from the coastal area of Yagaji Island in Northern Okinawa Island, Chikyukagaku, v.46(4), 257-274, 2012
  15. Tomohiro Toki, Yuto Uehara, Kazunari Kinjo, Akira Ijiri, Urumu Tsunogai, Hitoshi Tomaru, and Juichiro Ashi: Methane production and accumulation in the Nankai accretionary prism: Results from IODP Expeditions 315 and 316, Geochemical Journal, v.46, 89-106, 2012
  16. Tomohiro Toki, Kenji Maegawa, Urumu Tsunogai, Shinsuke Kawagucci, Naoto Takahata, Yuji Sano, Juichiro Ashi, Masataka Kinoshita, and Toshitaka Gamo: Gas chemistry of pore fluids from Oomine Ridge on the Nankai accretionary prism, In: Accretionary Prisms and Convergent Margin Tectonics in the Northwest Pacific Basin, Modern Approaches in Solid Earth Sciences, Yildirim Dilek, Yujiro Ogawa, Ryo Anma, Masataka Kinoshita, and Ryo Matsumoto (eds.), Springer, v.8, 247-262, 2011
  17. Tomohiro Toki, Urumu Tsunogai, Jun-ichiro Ishibashi, Motoo Utsumi, and Toshitaka Gamo: Methane enrichment in low-temperature hydrothermal fluids from the Suiyo Seamount in the Izu-Bonin Arc of the western Pacific Ocean, Journal of Geophysical Research, v.113, B08S13, 2008
  18. Tomohiro Toki, Urumu Tsunogai, Toshitaka Gamo, and Manabu Tanahashi: Geochemical studies of pore fluid in surface sediment on the Daini Atsumi Knoll, Journal of Geochemical Exploration, v.95, 29-39, 2007
  19. Tomohiro Toki, Toshitaka Gamo, and Urumu Tsunogai: Origins of hydrocarbons in the Sagara oil field, central Japan, The Island Arc, v.15, 285-291, 2006
  20. Tomohiro Toki, Urumu Tsunogai, Toshitaka Gamo, Shin’ichi Kuramoto, and Juichiro Ashi: Detection of low-chloride fluids beneath a cold seep field on the Nankai accretionary wedge off Kumano, south of Japan, Earth and Planetary Science Letters, v.228, 37-47, 2004
  21. Tomohiro Toki, Urumu Tsunogai, Toshitaka Gamo, and Masayuki Minakawa: Geochemical exploration of volcanic activity on the sea floor using CH4 as a tracer: Miyakejima volcano, Izu-Bonin arc, Japan, Kazan, v.48, 63-67, 2003
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