Representative XRF spectra of aqueous fluids and coexisting melts at HTHP conditions. Red spectra show XRF data from melt globules and blue spectra from fluids. (A) Exp. B at 730°C and 0.4 GPa in the haplogranite–H2O system. (B) Exp. BA at 760°C and 0.8 GPa in the haplogranite–5 M (Na, K)Cl solution system.