Melting Relationships in the System $$NaAlSi_{3}O_{8}-NaF-H_{2}O$$ to 4 Kilobars Pressure

Solubility of tin in (Cl, F)-bearing aqueous fluids at 700°C, 140MPa: A LA-ICP-MS study on synthetic fluid inclusions

“…composition of 53-63 wt% SiO 2 ; 23-31 wt% H 2 O and 13-16 wt% NaF. A similar water content of 30 wt% was determined for the eutectic melt composition in the system albite-NaF-H 2 O (Koster van Groos and Wyllie, 1968;Fig. 7b).…”

“…Intersection of this line with the array of recalculated NaF:SiO 2 -ratios defines the melt composition somewhere in the dark grey area. (b) An isobaric, isothermal cut through the eutectic point E in the system NaAlSi 3 O 8 -NaF-H 2 O at 688°C/100 MPa is shown for comparison (Koster van Groos and Wyllie, 1968). All compositions are plotted in terms of weight ratios.…”

Effects of F, B2O3 and P2O5 on the solubility of water in haplogranite melts compared to natural silicate melts

“…The increasing H20 solubility with increasing F content was also noticed by Koster van Note: analyzed with Cameca SX50 electron microprobe at Orl+ans (BRGM CNRS), analytical conditions: 6 nA, 15 Kv, 20 gna defocused beam, 5 s counting time for Na and K, 10 s counting time for Si, AI, F " Measured by Karl Fischer titration (Table 3) u Number of analyses (Table 3) u Number of analyses ~ Melt coexisting with a very low amount of quartz ( < 1 vol. %) d Melt coexisting with a significant amount of quartz Groos and Wyllie (1968) and is in agreement with the hypothesis of Manning (1981), suggesting that hydrated aluminofluoride groups may exist.…”

Solubility mechanisms of fluorine in peralkaline and meta-aluminous silicate glasses and in melts to magmatic temperatures

“…However, the extent of this temperature depression depends on the composition of the silicate melts. For highly polymerized melts such as NaAlSi 3 O 8 it can be as much as 200 -300°C, whereas for depolymerized materials such as, for example, CaMgSi 2 O 6 , the liquidus temperature depression is on the order of 100°C for F-saturated melts (Wyllie and Tuttle, 1961;van Groos and Wyllie, 1967;Luth, 1988a). It is likely that these differences result from different solution behavior of F in the melt.…”

“…Liquidus temperature depression resulting from dissolved fluorine in the melt resembles that of dissolved H 2 O (Wyllie and Tuttle, 1961;van Groos and Wyllie, 1967;Luth, 1988a). Further, the liquidus volumes of depolymerized silicate minerals expand as fluorine is dissolved (Foley et al, 1986;Luth, 1988a).…”