Browsing by Author "Takahata N."

Browsing by Author "Takahata N."

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  • Diffusive fractionation of noble gases in mantle with magma channels: Origin of low He/Ar in mantle-derived rocks 
    Yamamoto J.; Nishimura K.; Sugimoto T.; Takemura K.; Takahata N.; Sano Y. (2009)
    By crushing olivine and pyroxene phenocrysts in volcanic rocks from Kyushu Island, Japan, we determined 3He/4He of 3–7 Ra and 40Ar/36Ar of up to 1750. These values are lower than those of MORB. 4He/40Ar⁎ (down to 0.1) is ...
  • VOLCANIC FLUX OF NITROGEN FROM THE EARTH 
    Sano Y.; Takahata N.; Nishio Y.; Fischer T.P.; Williams S.N. (2001)
    The global flux of nitrogen from subduction zones is estimated by the elemental and isotopic compositions of nitrogen, argon and helium observed in volcanic gases and hydrothermal fluids in island arcs and in back-arc basin ...