Fig. 5: Li enrichment during stepwise-batch melting (8 kbar) and subsequent fractional crystallisation (4 kbar) mimicking the effect of fluorinated biotite in the protolith.
From: Melting of fluorine-rich biotite as a mechanism for generating lithium-rich granites
a Li enrichment during melting for modified versions of the reasonable-static and minimum/maximum \({D}_{{{{\rm{Li}}}}}^{{{{\rm{mineral/melt}}}}}\) suites (\({D}_{{{{\rm{Li}}}}}^{{{{\rm{biotite/melt}}}}}\) = 32.8, see text). The horizontal grey dotted line marks the point where \({D}_{{{{\rm{Li}}}}}^{{{{\rm{solid}}}}/{{{\rm{melt}}}}}\) switches from compatible to incompatible, driving the increase in melt Li enrichment. b Li enrichment during subsequent fractional crystallisation of the melt extracted from panel (a) at the point of complete biotite breakdown, using the reasonable-static and minimum/maximum suites of \({D}_{{{{\rm{Li}}}}}^{{{{\rm{mineral/melt}}}}}\) (with \({D}_{{{{\rm{Li}}}}}^{{{{\rm{biotite/melt}}}}}\) = 1.67 for all scenarios). The terminology \({D}_{{{{\rm{Li}}}}}^{{{{\rm{solid* /melt}}}}}\) in panel (b) reflects the presence of fluid in the fractionating assemblage, with solid*/melt referring to ((solid + fluid)/melt). The horizontal grey dotted line marks the point where \({D}_{{{{\rm{Li}}}}}^{{{{\rm{solid* /melt}}}}}\) switches from compatible to incompatible.
