The loss of fluids during metamorphism does not only would represent a process to selectively remove material from a subducting rock and to transpose the geochemical signature of one rock onto another one exposed to the escaping fluid. Instead, the partitioning of elements into the fluid also will result in isotopic fractionation. The partitioning and isotopic fractionation of the light elements has been quantified using hydrothermal experiments and major B and Li carrier in different lithologies.

Wunder, B., Deschamps, F., Watenphul, A., Guillot, S., Meixner, A., Romer, R.L., Wirth, R. (2010) The effect of chrysotile-nanotubes on the serpentine-fluid Li-isotopic fractionation. Contrib. Mineral. Petrol., 159: 781-790. doi:10.1007/s00410-009-0454-x

Meyer, C., Wunder, B., Meixner, A., Romer, R.L., Heinrich, W. (2008) Boron-isotope fractionation between tourmaline and fluid: An experimental re-investigation. Contrib. Mineral. Petrol., 156: 259-267. doi:10.1007/s00410-008-0285-1

Wunder, B., Meixner, A., Romer, R.L., Feenstra, A., Schettler, G., Heinrich, W. (2007) Lithium isotope fractionation between Li-bearing staurolite, Li-mica and aqueous fluids: an experimental study. Chem. Geol, 238: 277-290. doi:10.1016/j.chemgeo.2006.12.001

Wunder, B., Meixner, A., Romer, R.L., and Heinrich, W. (2006) Temperature-dependent isotopic fractionation of lithium between clinopyroxene and high-pressure hydrous fluids. Contrib. Mineral. Petrol., 151: 112-120. doi:10.1007/s00410-005-0049-0

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