The fluid/melt partitioning experiments on fluorine were carried out in the systemalbite-H2O-HF at P=100 MPa, 770℃≤T≤800℃ and wt= 2% - 6% conditions. The concentrations of fluorine in quenched glasses (melt) were determined by electron mictoprobe andthose of fluorine in the coexisting aqueous fluid were calculated by the method of mass balance.The result shows that the fluorine was concentrated in granitic melt relative to the coexistingfluid. The partition coefficient DF(wt/wt) ranges from 0. 35 to 0. 89. It increases with increasing nuorine content in the system. This means that there is not just one single value ofpartition coefficient for fluorine in the granitic melt-fluid system. The partitioning behavior offluorine in this system depends critically on fluorine and proton (H+) concentrations. Our datasuggest that F-rich granitic melts exist in nature and that fiuorine may not be an importantcomplexing agent of metal elements in F-bearing fluids.
展开▼
