Browsing by Author "Yamamoto J."
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Browsing by Author "Yamamoto J."
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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 ...
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Yamamoto J.; Kaneoka I.; Nakai S.; Kagi H.; Prikhod'ko V.; Arai S. (2004)By applying both vacuum crushing and stepwise heating methods for the extraction of the noble gases, we have discovered ³He/⁴He ratios much lower than the atmospheric ratio (∼0.3 RA; RA is the atmospheric ³He/⁴He ratio of ...
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Yamamoto J.; Kagi H.; Kaneoka I.; Lai Y.; Prikhod'ko V.S.; Arai S. (2002)Micro-Raman spectroscopic analysis allows us to estimate the internal pressure of small fluid inclusions. We applied this method to CO2-dominated fluid inclusions in mantle-derived xenoliths. The pressures estimated from ...
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LITHIUM ISOTOPIC SYSTEMATICS OF THE MANTLE-DERIVED ULTRAMAFIC XENOLITHS: IMPLICATIONS FOR EM1 ORIGIN Nishio Y.; Nakai S.; Yamamoto J.; Sumino H.; Matsumoto T.; Prikhod'ko V.S.; Arai S. (2004)Isotopic signatures of mantle-derived xenoliths have provided much information on the evolution of their mantle source regions. A recently developed multiple-collector inductively coupled plasma mass spectrometry method ...
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