GEOCHEMICAL JOURNAL
Online ISSN : 1880-5973
Print ISSN : 0016-7002
ISSN-L : 0016-7002
Composition of aqueous fluid from serpentinite in the subducted lithosphere
Yoshiyuki TatsumiNoboru Nakamura
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JOURNAL FREE ACCESS

1986 Volume 20 Issue 4 Pages 191-196

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Abstract

High pressure experiments up to 4.0GPa on natural serpentinite, one of constituent members of the hydrated subducted oceanic lithosphere, show that it decomposes totally at temperatures below 700°C. The results suggest that the serpentinite-derived aqueous fluid can be supplied to the mantle wedge only beneath the fore-arc region. The concentration of Rb, Sr and Yb in the aqueous fluid released through the dehydration process of serpentinite are estimated on the basis of open-system dehydration experiments under 1.5 and 3.0GPa, in which the fluid is lost through perforations on a gold sample container; the aqueous fluid transports a larger amount of an element with a larger ionic radius under higher pressures.

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© Geochemical Society of Japan
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