1992-1996: Department of Chemistry, Faculty of Science, The University of Tokyo. Awarded the degree of BSc in chemistry for a thesis entitled "Mossbauer studies on laser evaporated iron atoms and their reactions with oxygen in argon matrices". Work supervised by Professor T. Tominaga. 1996-1998: Department of Chemistry, Graduate School of Science, The University of Tokyo. Awarded the degree of MSc in chemistry for a thesis entitled "Noble gas isotope analysis of mantle-derived minerals". Work supervised by Professors H. Wakita and K. Notsu. 1998-2001: Department of Chemistry, Graduate School of Science, The University of Tokyo. Awarded the degree of PhD in chemistry for a thesis entitled "Origin of alkaline basalt volcanism inferred from noble gas isotopic systematics: Implications for mantle dynamics in back arc region of subduction zone". Work supervised by Professor K. Notsu. 2000-present: Assistant Professor at the Geochemical Research Center (former Laboratory for Earthquake Chemistry), Graduate School of Science, The University of Tokyo. Working with Professor K. Nagao on noble gas geochemistry. 2006-2007: Academic Visitor at the School of Earth, Atmospheric and Environmental Sciences, The University of Manchester, UK. Working with Professor C. Ballentine and Dr. Ray Burgess on noble gas and halogen geochemistry.

Isotope Geochemistry

Development of ultrahigh-sensitive and highly precise noble gas mass spectrometry. Volatile recycling in the Earth.

Sumino H., Dobrzhinetskaya L.F., Burgess R. and Kagi H. (2011) Deep-mantle-derived noble gases in metamorphic diamonds from the Kokchetav massif, Kazakhstan. Earth and Planetary Science Letters, 307, 439-449. Sumino H., Burgess R., Mizukami T., Wallis S.R., Holland G. and Ballentine C.J. (2010) Seawater-derived noble gases and halogens preserved in exhumed mantle wedge peridotite. Earth and Planetary Science Letters, 294, 163-172. Sumino H., Ikehata K., Shimizu A., Nagao K. and Nakada S. (2008) Magmatic processes of Unzen volcano revealed by excess argon distribution in zero-age plagioclase phenocrysts. Journal of Volcanology and Geothermal Research, 175, 189-207. Sumino H., Kaneoka I., Matsufuji K. and Sobolev A.V. (2006) Deep mantle origin of kimberlite magmas revealed by neon isotopes. Geophysical Research Letters, 33, L16318, doi: 10.1029/2006GL027144. Sumino H., Notsu K., Nakai S., Sato M., Nagao K., Hosoe M. and Wakita H. (2004) Noble gas and carbon isotopes of fumarolic gas from Iwojima volcano, Izu-Ogasawara arc, Japan: implications for the origin of unusual arc magmatism. Chemical Geology, 209, 153- 173. Sumino H., Nagao K. and Notsu K. (2001) Highly sensitive and precise measurement of helium isotopes using a mass spectrometer with double collector system. Journal of the Mass Spectrometry Society of Japan, 49, 61-68. Sumino H., Nakai S., Nagao K. and Notsu K. (2000) High 3He/4He ratio in xenoliths from Takashima: evidence for plume type volcanism in southwestern Japan.

Geophysical Research Letters, 27, 1211-1214.