Fig. 3: Thermodynamic modelling of zircon saturation as function of initial melt H2O content. | Nature Communications

Fig. 3: Thermodynamic modelling of zircon saturation as function of initial melt H2O content.

From: A zircon case for super-wet arc magmas

Fig. 3

Rhyolite-MELTS modelling of zircon saturation for an andesitic starting composition at 400 MPa for initial water contents between 2 and 8 wt.%. A Temperature vs melt fraction relationship; symbols indicate where zircon saturates given Zri of 100 ppm (circles) and 200 ppm (squares). Grey dashed contours indicate when residual melts reach 65, 70 and 75 wt.% SiO2 (calculated on an anhydrous basis). B The concentration of Zr in residual melt (Zrliquid) during melt cooling and crystallisation with dashed and dotted lines showing the trajectories for 200 ppm and 100 ppm Zri, respectively. The mineral-melt partition coefficients for Zr (DZr) were compiled and parameterised as a function of temperature (see “Methods” section). Solid lines show the temperatures and Zr concentrations at which zircon saturates for each rhyolite-MELTS model with different water contents (A for legend). Zircon saturation occurs where dashed/dotted and solid lines of the same colour intersect (marked by square/circle symbols). Subsequent to zircon saturation, Zrliquid follows solid lines.

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