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

Mysen, Bjørn O.; Cody, George D.; Smith, Ashley Wilder

doi:10.1016/j.gca.2003.12.015

Cited by 101 publications

(60 citation statements)

References 58 publications

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“…Work done by Zimova and Webb 27) showed an increase of viscosity with Cl addition in the Na2O-Fe2O3-Al2O3-SiO2 at certain compositions and indicated a polymerization of the melt with certain halide compound additions. Mysen et al 28) showed similar results of polymerization with fluorine additions to the meta-aluminous silicate glasses, where polymerization of the silicate network could occur by reactions previously described in reaction (6) and provided a simple reaction mechanism for polymerization when NaF is added to the Na2O-SiO2 slag system, which is described in reaction (7).…”

Section: Effect Of Caf2 On Hydrogen Solubility and Slagmentioning

confidence: 66%

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

2011

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The hydrogen solubility in the CaF2-CaO-SiO2 slag system has been studied to identify and compare the hydrogen dissolution behavior according to basicity and CaF2 content at high temperature of 1 823 K. The hydrogen solubility typically increases with higher CaF2 content across the entire compositional range, but its effect is more pronounced at higher basicity. At low basicity, CaF2 seems to slightly polymerize the slag network increasing the available incorporation sites, where hydrogen can attach and increase hydrogen content in slag. At high basicity, the slag structure is already highly depolymerized and CaF2 addition does not affect the silicate structure, but likely affects the slag hydrogen solubility by lowering the hydroxyl activity. CaO additions lowered the hydrogen content in slag at low basicity and increased the hydrogen content in slag at high basicity. From the temperature dependence of the hydrogen solubility, the dissolution energy of hydrogen in slag was found to be 42.3 kcal/mol.

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Section: Effect Of Caf2 On Hydrogen Solubility and Slagmentioning

confidence: 66%

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

2011

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“…Previous work on F and Cl solution behavior in aluminosilicate melts (Mysen and Virgo 1985;Kohn et al 1991;Schaller et al 1992;Zeng and Stebbins 2000;Mysen et al 2004;Zimova and Webb 2006;Baasner et al 2013) have shown that F preferentially bonds with tetrahedrally coordinated cations such as Al and Si. Although in more complex melts such as basalt, F can also preferentially bond with Mg (Kiczenski et al 2004;Filiberto et al 2012) and form more complex bonds as Al-F-Ca or Al-F-Na (Zeng and Stebbins 2000;Mysen et al, 2004); Si-F and Al-F are always found. Moreover, as NBO/T increases, F bonding and dissolution in silicate melts is favored (Mysen et al 2004).…”

Section: Effect Of Melt Structure On F and CL Partition Coefficientsmentioning

confidence: 97%

“…Mysen et al 2004), especially in F-rich samples. Because F depolymerizes melts equally or more efficiently than H 2 O (Dingwell and Virgo 1987; Mysen et al 2004) the NBO/T data presented in Figure 3 were corrected for F content, assuming that F has the same depolymerizing effect as H 2 O (Mysen 2007 …”

Section: Effect Of Melt Structure On F and CL Partition Coefficientsmentioning

confidence: 99%

“…Although in more complex melts such as basalt, F can also preferentially bond with Mg (Kiczenski et al 2004;Filiberto et al 2012) and form more complex bonds as Al-F-Ca or Al-F-Na (Zeng and Stebbins 2000;Mysen et al, 2004); Si-F and Al-F are always found. Moreover, as NBO/T increases, F bonding and dissolution in silicate melts is favored (Mysen et al 2004). In contrast, Cl preferentially bonds with network-modifier cations (Ca, Na, K; Stebbins and Du 2002;Sandland et al 2004;Zimova and Webb 2006;Dalou and Mysen 2012;Baasner et al 2013) or with Fe 2+ in F-rich basalt (Filiberto and Treiman 2009;Filiberto et al 2014), and its solubility in aluminosilicate melts decreases with increasing NBO/T (Dalou and Mysen 2012).…”

Section: Effect Of Melt Structure On F and CL Partition Coefficientsmentioning

confidence: 99%

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Contrasting partition behavior of F and Cl during hydrous mantle melting: implications for Cl/F signature in arc magmas

Dalou

Koga

Voyer

et al. 2014

Prog. in Earth and Planet. Sci.

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We present the results of five experiments on F and Cl partitioning during hydrous mantle melting under conditions relevant to subduction zone magmatism (1.2-2.5 GPa, 1,180°C-1,430°C). For each experiment, we determined the F and Cl partition coefficients between lherzolitic mineral phases (olivine, orthopyroxene (opx), clinopyroxene (cpx), and garnet), amphibole, and hydrous basaltic melts (0.2-5.9 wt.% dissolved H 2 O). At constant pressure, D increases from 0.009 ± 0.0005 to 0.015 ± 0.0008. Experimentally determined F and Cl partition coefficients were used in a hydrous melting model of a lherzolitic mantle metasomatized by slab fluid. In this model, we vary the amount of metasomatic slab fluid added into the mantle while its composition is kept constant. Increasing the amount of fluid results in an increase of both the degree of melting (due to the effect of H 2 O addition) and the F and Cl input in the mantle wedge. Because of the change of F and Cl partition coefficients with the increase of H 2 O, the observed variation in the F and Cl contents of the modeled melts is produced not only by F and Cl input from the fluid, but also by the changes in F and Cl fractionation during hydrous melting. Overall, the model predicts that the Cl/F ratio of modeled melts increases with increasing fluid fraction. Therefore, a variation in the amount of fluid added to the mantle wedge can contribute to the variability in Cl/F ratios observed in arc melt inclusions.

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“…The high level of F is responsible for depolymerization of the silicate melt and the complexation of the REEs and other high field strength (HFS) elements (Keppler, 1993;Mysen et al, 2004).…”

Section: Accessory Mineralsmentioning

confidence: 99%

The transition from peraluminous to peralkaline granitic melts: Evidence from melt inclusions and accessory minerals

Thomas

Webster

Rhede

et al. 2006

Lithos

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Fractional crystallization of peraluminous F-and H 2 O-rich granite magmas progressively enriches the remaining melt with volatiles. We show that, at saturation, the melt may separate into two immiscible conjugate melt fractions, one of the fractions shows increasing peraluminosity and the other increasing peralkalinity. These melt fractions also fractionate the incompatible elements to significantly different degrees. Coexisting melt fractions have differing chemical and physical properties and, due to their high density and viscosity contrasts, they will tend to separate readily from each other. Once separated, each melt fraction evolves independently in response to changing T/P/X conditions and further immiscibility events may occur, each generating its own conjugate pair of melt fractions. The strongly peralkaline melt fractions in particular are very reactive and commonly react until equilibrium is attained. Consequently, the peralkaline melt fraction is commonly preserved only in the isolated melt and mineral inclusions.We demonstrate that the differences between melt fractions that can be seen most clearly in differing melt inclusion compositions are also visible in the composition of the resulting ore-forming and accessory minerals, and are visible on scales from a few micrometers to hundreds of meters.

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

Cited by 101 publications

References 58 publications

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

Hydrogen Dissolution in the CaF2–CaO–SiO2 System

Contrasting partition behavior of F and Cl during hydrous mantle melting: implications for Cl/F signature in arc magmas

The transition from peraluminous to peralkaline granitic melts: Evidence from melt inclusions and accessory minerals

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