Helium and carbon isotopes in flourites: Implications for mantle carbon contribution in an subduction zone

Junji Yamamoto, Makoto Watanabe, Yoshiyuki Nozaki, Yuji Sano

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)19-26
Number of pages8
JournalJournal of Volcanology and Geothermal Research
Volume107
Issue number1-3
DOIs
Publication statusPublished - Jun 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Geochemistry and Petrology

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