TY - JOUR
T1 - Helium and carbon isotopes in flourites
T2 - Implications for mantle carbon contribution in an subduction zone
AU - Yamamoto, Junji
AU - Watanabe, Makoto
AU - Nozaki, Yoshiyuki
AU - Sano, Yuji
PY - 2001/6
Y1 - 2001/6
N2 - The concentrations of helium and carbon in fluorite associated with Cretaceous to Neogene (90-13 Ma) granitic magmatism in the Japanese arc have been measured. Concentrations of Li, U, Th and Gd were measured to correct for secondary generated 3He. The CO2/3 He of fluorites are almost uniform (1.5 x 1010 -4 x 1010) and in fair agreement with the range of present island arc volcanic gases. The calculated mantle C contribution in the Mesozoic subduction zone appear to have been identical to the present one (7-19%) indicating that the C flux from the mantle in supra-subduction zone environments has remained fairly constant during the past 70 million years.
AB - The concentrations of helium and carbon in fluorite associated with Cretaceous to Neogene (90-13 Ma) granitic magmatism in the Japanese arc have been measured. Concentrations of Li, U, Th and Gd were measured to correct for secondary generated 3He. The CO2/3 He of fluorites are almost uniform (1.5 x 1010 -4 x 1010) and in fair agreement with the range of present island arc volcanic gases. The calculated mantle C contribution in the Mesozoic subduction zone appear to have been identical to the present one (7-19%) indicating that the C flux from the mantle in supra-subduction zone environments has remained fairly constant during the past 70 million years.
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U2 - 10.1016/S0377-0273(00)00315-2
DO - 10.1016/S0377-0273(00)00315-2
M3 - Article
AN - SCOPUS:0035360541
SN - 0377-0273
VL - 107
SP - 19
EP - 26
JO - Journal of Volcanology and Geothermal Research
JF - Journal of Volcanology and Geothermal Research
IS - 1-3
ER -