Reika Yokochi

Bio:

Research Interests:

Planetary Science, Noble Gas Geochemistry, Hydrology

Studies of stable noble gases in Earth's crust, mantle and potential precursors have provided constraints on broad range of subjects, such as planetary evolution, fluid migration in the crust, tectonic activity, and paleoclimate. Naturally occurring radioactive noble gases (39Ar, 81Kr and 85Kr) are also fascinating new geochemical tracers. Using both stable and radioactive noble gases, I am exploring new and interdisciplinary fields of noble gas geochemistry. Ongoing projects include:

(i) determination of crustal fluid migration rates using radioactive noble gases,

(ii) investigation of gas trapping efficiencies in water ice under conditions relevant to comet formation, and

(iii) search for new noble gas paleotemperature proxies in crustal minerals.

(Source: Department of Geophysical Sciences)

Recent Publications:

• Yokochi R., Purtschert R., Suda Y., Sturchio N.C., Sültenfuß J., Vockenhuber C. (2021) Chemical and isotopic constraints on hydrological processes in Unzen volcanic geothermal system. Journal of Volcanology and Geothermal Research, in press.

• Yokochi R., Zappala J.C., Purtschert R., Mueller P. (2021) Origin of water masses in Floridan Aquifer System revealed by ⁸¹Kr. Earth and Planetary Science Letters, 569: 117060.

• Purtschert R., Yokochi R., Jiang W., Lu Z-. T., Mueller P., Zappala J. C., Heerden E.V., Cason E., Lau M., Kieft T., Gerber C., Brennwald M., Onstott T. (2021) Underground production of ⁸¹Kr detected in subsurface fluids. Geochimica et Cosmochimica Acta, 295: 65-79.

• J. Y. Hu, N. Dauphas, F. L. H. Tissot, R. Yokochi, T. J. Ireland, Z. Zhang, A. M. Davis, F. J. Ciesla, L. Grossman, B. L. A. Charlier, M. Roskosz, E. E. Alp, M. Y. Hu, J. Zhao (2021) Heating Events in the Nascent Solar System Recorded by Rare Earth Element Isotopic Fractionation in Refractory Inclusions. Science Advances, 7: eabc2962.