Carbon and helium isotopic ratios at Kusatsu-Shirane Volcano, Japan

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書誌事項

公開日
1994-07
権利情報
  • https://www.elsevier.com/tdm/userlicense/1.0/
  • https://www.elsevier.com/legal/tdmrep-license
DOI
  • 10.1016/0883-2927(94)90059-0
公開者
Elsevier BV

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説明

Abstract We have measured the chemical compositions, He/Ne ratios, He and C isotopes of 14 gas samples collected from the crater lake, fumaroles and hot springs associated with Kusatsu-Shirane Volcano, Japan. The 3 He/ 4 He ratio decreases with increasing distance from the central crater of the volcano to the sampling site whereas the δ 13 C value of CO 2 increases with the distance. This tendency suggests that high 3 He/ 4 He-low δ 13 C magmatic gas is mixed with and/or diluted by low 3 He/ 4 He-high δ 13 C crustal gas with increasing distance from the crater. Alternatively, the variation of δ 13 C values may be the result of isotope fractionation during migration since the isotope shift is relatively small. Based on the apparent mixing trend in a 3 He/ 4 He-δ 13 C diagram, the magmatic He and CO 2 in the volcano may have a 3 He/ 4 He ratio of 8 R atm and a δ 13 C value of −3.2%, respectively. The CO 2 / 3 He ratios show a positive correlation with temperature of fumaroles or hot springs, which may be caused by a difference of temperature dependencies of the solubilities between CO 2 and He.

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