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OF THE CONTRASTING BEHAVIOR OF TWO MAGMATIC VOLATILES : CHLORINE AND CARBON DIOXIDE

Chlorine (Cl) and carbon dioxide (CO 2) are common magmatic volatiles with contrasting behaviours. CO 2 solubility increases with pressure whereas Cl solubility shows relatively little pressure or temperature effect. CO 2 speciation changes with silicate melt composition, dissolving as carbonate in basaltic magmas and molecular CO 2 in more silicic compositions. In H 2O-bearing systems, the strongly non-ideal behavior of alkali chlorides causes unmixing of the volatile phase to form a H 2O-rich vapor and a hydrosaline phase with important implications for the maximum concentration of Cl in magmas. Addition of CO 2 to the magma hastens immiscibility at crustal pressures (< 500 MPa), inducing the formation of CO 2-rich vapors and Cl-rich hydrosaline melts.