Synthetic Fluid Inclusions XIV: Coexisting Silicate Melt and Aqueous Fluid Inclusions in the Haplogranite-H2O-NaCl-KCl System

The partitioning of sulfur and chlorine between andesite melts and magmatic volatiles and the exchange coefficients of major cations

“…Stelling et al (2008) This is consistent with the data of Webster and De Vivo (2002) on the effect of melt composition on Cl solubility. The à K volatile=melt K;Na of 1.23 ± 0.10 determined here is higher than the range of 0.4-0.75 found in felsic systems (Holland, 1972;Shinohara et al, 1989;Bai and van Groos, 1999;Schafer et al, 1999;Student and Bodnar, 1999;Frank et al, 2003). As discussed in Section 4.3, à K volatile=melt Fe;Na is formulated in accordance with a Fe:Cl ratio of 1 in the stable Fe complexes in the volatile phase.…”

“…These elements thus compete for the available chloride ligands and their relative abundance will be defined by their activities in the silicate melt and their exchange coefficients between the two phases, as described by Gammon et al (1969). This formulation has been used to describe alkali exchange equilibria in felsic systems (Holland, 1972;Shinohara et al, 1989;Candela and Piccoli, 1995;Bai and van Groos, 1999;Schafer et al, 1999;Student and Bodnar, 1999;Frank et al, 2003;Zajacz et al, 2008), and will be used here to simplify comparison. Accordingly, the mass transfer of Na and K between the melt and the volatile phase can be described by the following mass action expression:…”

“…Yet, data for the exchange equilibrium of K and Na between melts and volatiles exists only for felsic melt compositions (Holland, 1972;Shinohara et al, 1989;Bai and van Groos, 1999;Schafer et al, 1999;Student and Bodnar, 1999); speciation becomes an even more formidable problem considering the abundance of FeCl 2 (Simon et al, 2004) and HCl (Williams et al, 1997;Frank et al, 2003) in magmatic volatiles.…”

Combined microthermometric and Raman spectroscopic technique to determine the salinity of H2O–CO2–NaCl fluid inclusions based on clathrate melting

“…Today the synthetic fluid inclusion technique is used routinely to study various fluid properties at elevated P-T conditions (Sterner and Bodnar, 1984;Bodnar and Sterner, 1987), including systems involving silicate melt and aqueous fluids (Student and Bodnar, 1999). In a recent study of the effect of CO 2 on copper partitioning between silicate melts and magmatic fluids, Tattitch et al (2010) trapped synthetic H 2 O-CO 2 -NaCl inclusions in the two-fluid phase field at 800°C and 100 MPa.…”

Determination of fluid/melt partition coefficients by LA-ICPMS analysis of co-existing fluid and silicate melt inclusions: Controls on element partitioning

“…Using the slopes of the fitted linear trends, and a value of c = 0.45 for Na (Holland, 1972; postentrapment loss of Na from the SMI prevents the use of our values) we can calculate directly the exchange constants to be K fluid=melt K;Na Shinohara et al, 1989;Bai and van Groos, 1999;Schafer et al, 1999;Student and Bodnar, 1999). Experiments of Simon et al (accepted for publication) (100 and 140 MPa, 800°C) yielded up to an order of magnitude higher partition coefficients for Ag, but also revealed a strong negative correlation between D fluid=melt Ag and pressure.…”