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《Geochimica》 1998-01
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EXPERIMENT ON THE FLUID/MELT PARTITION OF FLUORINE IN THE SYSTEM ALBITE GRANITE-H_2O-HF

Xiong Xiaolin; Zhao Zhenhua(Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640)Zhu Jinchu; Rao Bing; Lai Mingyuan(Department of Earth Sciences, Nanjing University, Nanjing 210093)  
The fluid/melt partitioning experiments for fluorine were carried out in the systemalbite granite-H_2O-HF at p = 100MPa, 770℃≤t≤800℃ and W_F = 2%-6% conditions.The concentrations of major elements and fluorine in quenched glasses (melt) weredetermined by electron microprobe and fluorine concentrations in coexisting aqueousfluid were calculated by mass balance method. The result shows that fluorineconcentrates in granitic melt relative to coexisting fluid at our experimental conditions.The partition coefficient D_F(W~(Fl)/W~(Mt)) ranges from 0.35 to 0.89, but it increases withincreasing fluorine content in the system. This means that there is not just one singlevalue of partition coefficient for fluorine in granitic melt-flind system. The partitionbehavior of fluorine in such a system depends critically on fluorine and proton (H~+)concentration. Our data suggest that F-rich granitic melt exist in nature and thatfluorine may not be important in the mass transport of ore-forming elements inF-bearing granitic melt-fluid system.
【Fund】: 国家自然科学基金!49603048;;南京大学内生矿床成矿机制研究国家重点实验室资助
【CateGory Index】: P599
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