- ELSEVIER SCIENCE BV
The concentrations of helium and carbon in fluorite associated with Cretaceous to Neogene (90-13 Ma) granitic magmatism in the Japanese are have been measured. Concentrations of Li, U, Th and Gd were measured to correct for secondary generated He-3. The CO2/He-3 of fluorites are almost uniform (1.5 x 10(10)-4 x 10(10)) and in fair agreement with the range of present island are 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. (C) 2001 Elsevier Science B.V. All rights reserved.
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- DOI : 10.1016/S0377-0273(00)00315-2
- ISSN : 0377-0273
- CiNii Articles ID : 80012633104
- Web of Science ID : WOS:000169651400002