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The Li isotope signatures of hydrothermal fluids are remarkably constant (δLi7=8.0±1.9‰) irrespective of the water/rock ratio (W/R), permeability, temperature or fluid involved (seawater or meteoric). High temperature hydrothermal fluids represent the second most significant source of Li to the ocean, yet the homogeneity of the Li isotopic signatures of this source remains to be explained and in this...
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