WHAT'S NEW

Launch our lab at ISAS/JAXA. Five postdocs have joined and 3 new grad students will come next spring [Link]

Move to ISAS/JAXA (July, 2018) [Link]

Visit our research team website [Link]

New article on volatile inventories of terrestrial planets (SSR) (July 2018) [Link]

SELECTED PUBLICATIONS [complete publication list]

Mars water & magmatism

Kurokawa, H., Kurosawa, K. and Usui, T. (2018) A lower limit of atmospheric pressure on early Mars inferred from nitrogen and argon isotopic compositions. Icarus, 299, 443-459 [Link]

Usui, T. (2017) Martian water stored underground. Nature, 552, 339-340. [Link]

Ehlmann, B. L. et al. (incl. Usui, T.) (2016) The sustainability of habitability on terrestrial planets: insights, questions, and needed measurements from Mars for understanding the evolution of Earth-like worlds. Journal of Geophysical Research-Planets, 121, DOI: 10.1002/2016JE005134. [Open Access] [Top-10 most downloaded paper in 2016-2017 JGR]

Kurokawa, H., Usui, T. and Sato, M. (2016) Interactive evolution of multiple water-ice reservoirs on Mars: Insight from hydrogen isotope compositions. Geochemical Journal, 50, 67–79. DOI:10.2343/geochemj.2.0407.

Usui T., Alexander C. M.O'D., Wang J., Simon J. I., and Jones J. H. (2015) Meteoritic evidence for a previously unrecognized hydrogen reservoir on Mars. Earth and Planetary Science Letters 410, 140-151. [Top-rated article in EPSL] [NASA press release]

Peters, T. J., Simon, J. I., Jones, J. H., Usui, T., Moriwaki, R., Economos, R. C., Schmitt, A. K., and McKeegan, K. D. (2015) Tracking the source of the enriched martian meteorites in olivine-hosted melt inclusions of two depleted shergottites, Yamato 980459 and Tissint. Earth and Planetary Science Letters 418, 91–102.

Kurokawa H., Sato M., Ushioda M., Matsuyama T., Moriwaki R. Dohm, J. M., and Usui, T. (2014) Evolution of Water Reservoirs on Mars: Constraints from Hydrogen Isotopes in Martian Meteorites. Earth and Planetary Science Letters 394, 179-185.

Usui T., Alexander C. M.O'D., Wang J., Simon J. I., and Jones J. H. (2012) Origin of water and mantle–crust interactions on Mars inferred from hydrogen isotopes and volatile element abundances of olivine-hosted melt inclusions of primitive shergottites. Earth and Planetary Science Letters 357-358, 119-129. [NASA press release]

Usui T., Sanborn M., Wadhwa M., and McSween H. Y. (2010). Petrology and trace element geochemistry of Robert Massif 04261 and 04262 meteorites, the first examples of geochemically enriched lherzolitic shergottites. Geochimica et Cosmochimica Acta 74, 7283-7306.

Usui T., McSween H. Y., and Clark B. C. III. (2008). Petrogenesis of high-phosphorous Wishstone-class rocks in Gusev crater, Mars. Journal of Geophysical Research–Planets 113, E12S44, doi:10.1029/2008JE003225.

Usui T., McSween H. Y., and Floss C. (2008). Petrogenesis of olivine-phyric shergottite Yamato-980459, revisited. Geochimica et Cosmochimica Acta 72, 1711-1730.


Earth's water circulation

Kurokawa, H., Foriel, J., Laneuville, M., Houser, C., and Usui, T. (2018) Subduction and atmospheric escape of Earth's seawater constrained by hydrogen isotopes, Earth and Planetary Science Letters 497, 149-160 [Link]

Usui T., Kobayashi K., Nakamura E., and Helmstaedt H. (2007). Trace element fractionation in deep subduction zones inferred from a lawsonite-eclogite xenolith from the Colorado Plateau. Chemical Geology 239, 336-351.

Usui T., Nakamura E., and Helmstaedt H. (2006). Petrology and geochemistry of eclogite xenoliths from the Colorado Plateau: Implications for the evolution of the subducted oceanic crust. Journal of Petrology 47, 929–964.

Usui T., Nakamura E., Kobayashi K., Maruyama S., and H. Helmstaedt (2003). Fate of the subducted Farallon plate inferred from eclogite xenoliths in the Colorado Plateau. Geology 30, 589-592.


DAWN & asteroid

Usui T., Jones J. H., and Mittlefehldt D. W. (2015) A partial melting study of an ordinary (H) chondrite composition with application to the unique achondrite Graves Nunataks 06128 and 06129. Meteoritics & Planetary Science 50, 759-781.

Usui, T. and Iwamori, H. (2013) Mixing relations of the howardite-eucrite-diogenite suite: a new statistical approach of independent component analysis for the Dawn mission. Meteoritics & Planetary Science 48, 2289-2299.

Usui T., McSween H. Y., Mittlefehldt D. W., and Prettyman T. H. (2010). K-Th-Ti systematics and new three-component mixing model of HED meteorites: Prospective study for interpretation of gamma-ray and neutron spectra for the Dawn mission. Meteoritics & Planetary Science 45, 1170-1190.

Usui T. and McSween H. Y. (2007). Geochemistry of 4 Vesta based on HED meteorites: Prospective study for interpretation of gamma ray and neutron spectra for the Dawn mission. Meteoritics & Planetary Science 42, 269–283.