Partitioning of F between aqueous fluids and albite granite melt and its petrogenetic and metallogenetic significance |
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Authors: | Xiong Xiaolin Zhao Zhenhua Zhu Jinchu Rao Bing Lai Mingyuan |
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Institution: | (1) Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou;(2) Department of Earth Sciences, Nanjing University, 210093 Nanjing |
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Abstract: | The fluid/melt partitioning experiments on fluorine were carried out in the system albite-H2O-HF atP = 100 MPa, 770°C ≤T≤800°C: and wt = 2% −6% conditions. The concentrations of fluorine in quenched glasses (melt) were determined
by electron microprobe and those 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 coexisting fluid. The partition coefficient
DF(wt
F
F1
/wt
F
Mt
) ranges from 0.35 to 0.89. It increases with increasing fluorine content in the system. This means that there is not just
one single value of partition coefficient for fluorine in the granitic melt-fluid system. The partitioning behavior of fluorine
in this system depends critically on fluorine and proton (H+) concentrations. Our data suggest that F-rich granitic melts exist in nature and that fluorine may not be an important complexing
agent of metal elements in F-bearing fluids.
The project was financially supported by both the National Natural Science Foundation of China (No. 49603048) and the State
Key Laboratory of Mineral Deposit Research, Nanjing University. |
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Keywords: | albite granite-H2O-HF system fluorine partition coefficient |
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