Last Update 04/06 2007
Samples of volcanic rock give us information on geochemical evolution of the Earth and clues to elucidate material transfer within the Earth. My group is working on developing analytical methods for trace elements and isotope tracers to read the records kept in the samples. Current main research targets are Li and Be isotope tracers to investigate material transfer in subduction zones and W isotope tracer to investigate core-mantle interactions.
Nishio, Y., Nakai, S., Yamamoto, J., Sumino, H., Matsumoto, T., Prikhod°«ko, V. S., Arai, S., Lithium isotopic systematics of the mantle-derived ultramafic xenoliths: implications for EM1 origin, Earth Planet. Sci. Lett., 217, 245--261, 2004.
Sahoo, Y, Nakai, S., and Ali, A., Modified ion exchange separation for tungsten isotopic measurements from kimberlite samples using multi-collector inductively coupled plasma mass spectrometry, The Analyst, 131, 434--439, 2006.
Nishio, Y., Nakai, S., Ishii, T., Sano, Y., Isotope systematics of Li, Sr, Nd, and volatiles in Indian Ocean MORBs of the Rodrigues Triple Junction: constraints on the origin of the DUPAL anomaly., Geochim. Cosmochim. Acta, 71, 745--759, 2007.