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Geology; October 2004; v. 32; no. 10; p. 865-868; DOI: 10.1130/G20610.1
© 2004 Geological Society of America
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Composition of fluids during serpentinite breakdown in subduction zones: Evidence for limited boron mobility

Eric Tenthorey1 and Jörg Hermann1

1 Research School of Earth Sciences, Australian National University, Mills Road, Canberra ACT 0200, Australia

We experimentally investigated the trace element compositions of fluids released during breakdown of subducted serpentinites. Serpentinites contain significant amounts of fluid-mobile elements such as B, Cs, As, and Ba, which during seafloor alteration are incorporated into mantle rocks. During the later high-pressure breakdown of the serpentinites, these trace elements are redistributed among the residual olivine, orthopyroxene, minor chlorite, and fluid. We find that B is far more compatible in these minerals than previously assumed; it has a fluid/residue partition coefficient (F/RD) of 3–5. Most other fluid-mobile elements (Cs, As, Ba, Pb) are strongly enriched in the fluid and exhibit expected F/RD values of 30–250. Serpentinites are possibly the most important sink for B in subduction zones; the experimental results suggest that significant B is recycled into the deep mantle. Furthermore, high B concentrations in mantle olivines might be a fingerprint for previous metasomatism or serpentinization.

Key Words: boron • subduction • serpentinite • olivine




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