The behaviour of tungsten in granitic melt-vapour systems

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Authors:Manning, David A. C.; Henderson, Paul
Author Affiliations:Primary:
Vandoeuvre-lès-Nancy, Cent. Rech. Petrogr. et Geochim., Nancy, France
Brit. Mus. Natl. Hist., Dep. Mineral., United Kingdom
Volume Title:Contributions to Mineralogy and Petrology
Source:Contributions to Mineralogy and Petrology, 86(3), p.286-293. Publisher: Springer International, Heidelberg-New York, International. ISSN: 0010-7999
Publication Date:1984
Note:In English. 39 refs.; illus. incl. 4 tables
Summary:An experimental study to determine the effect of solution composition on the partitioning behaviour of tungsten in granitic melt-vapor systems at 800°C and 1 kbar. With chloride and phosphate solutions, tungsten partitions strongly into the aqueous phase, whereas with fluoride, carbonate and borate solutions, and water alone, tungsten partitions in favor of the melt. With chloride solutions, the fluid/melt partition coefficients (KD) for W show a marked positive correlation with chloride concentration, and suggest that a low chloride concentrations W-Cl complexes with low Cl:W ratios (such as associated equivalents of (WO3)2Cl-) may be present. In contrast, at higher chloride concentrations complexes with high Cl:W ratios (such as WOCl4, WCl6 and associated ionic equivalents) may predominate. With phosphate solutions, KD shows little variation with phosphate concentration, and phosphorus heteropolytungstates (such as H3[PW12O40]) may be present. There is no evidence to suggest that fluoride, carbonate or borate complexes of tungsten are important under the experimental conditions; the data for these compositions can be interpreted assuming that isopolytungstates (such as H6[H2W12O40]) are present. Within high temperature hydrothermal solutions tungsten may be transported principally as isopolytungstates and heteropolytungstates in addition to chloride complexes, and this may, in part, account for the common association of apatite and arsenopyrite with scheelite and wolframite in tungsten deposits. modified journal abstract. [P.Br.]
Subjects:Apatite; Arsenides; Arsenopyrite; Experimental studies; Geochemistry; Granites; Igneous rocks; Melting; Melts; Metals; Phase equilibria; Phosphates; Plutonic rocks; Scheelite; Sulfides; Tungstates; Tungsten; Wolframite
Abstract Numbers:85M/0360
Record ID:1985002517
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute.
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