Investigation of the He solubility in H2O–CO2 bearing silicate liquids at moderate pressure: a new experimental method

The CO2-He-Ar-H2O systematics of the manus back-arc basin: resolving source composition from degassing and contamination effects

“…To explain the Manus glass data by degassing, an ␣ value of ϳ0.2 would be needed, assuming an initial [He] ϭ 15 ϫ 10 -6 cm 3 STP/g (calculated using the regression through our data and the equation: (CO 2 / 3 He) final /(CO 2 / 3 He) initial ϭ F ␣-1 , where F is the fraction of gas remaining in the residual phase). Although King and Holloway (2002) reported enhanced CO 2 solubility with increasing water contents for andesitic lavas, Paonita et al (2000) noted an increase in He solubility in water saturated magmas. To date, therefore, experimental evidence suggesting ␣ becomes Ͻ1 (for tholeiitic lavas) is lacking.…”

Geochemistry of fluid discharges from Peteroa volcano (Argentina-Chile) in 2010–2015: Insights into compositional changes related to the fluid source region(s)

“…1) compare the results from the Papale et al (2006) model with the experimental data by Lesne et al (2011) and Behrens et al (2004) for basaltic and dacitic magmas, and properly regulate the FeO/Fe 2 O 3 ratio of the model to fit the experimental results; 2) use Ar solubility as a proxy for predicting N 2 solubility in silicate melts; 3) use the experimental relationship of He and Ar solubility versus dissolved H 2 O in melt found by Paonita et al (2000Paonita et al ( , 2012 in order to compute the effects of H 2 O on Henry's constant of the inert gases.…”

No slab‐derived CO2 in Mariana Trough back‐arc basalts: Implications for carbon subduction and for temporary storage of CO2 beneath slow spreading ridges

“…Solubility is a function of melt structure and so can change with composition but these changes are minor in the restricted range of basaltic compositions [ Carroll and Webster , 1994; Dixon and Stolper , 1995]. Therefore, changes in basalt chemistry, alone, produce negligible fractionation between volatiles, although variations in the amount of water dissolved in melt can profoundly influence the solubility of other volatile species [ Dixon and Stolper , 1995; Paonita et al , 2000]. For any particular batch of magma there are then two further properties that affect solubility and, hence, the fractionation of different volatile species; pressure and melt volume.…”