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

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

Determination of fluid/melt partition coefficients by LA-ICPMS analysis of co-existing fluid and silicate melt inclusions: Controls on element partitioning   (Citations: 18)
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Analyses of co-existing silicate melt and fluid inclusions, entrapped in quartz crystals in volatile saturated magmatic systems, allowed direct quantitative determination of fluid/melt partition coefficients. Investigations of various granitic systems (peralkaline to peraluminous in composition, logfO2=NNO−1.7 to NNO+4.5) exsolving fluids with various chlorinities (1–14mol/kg) allowed us to assess the effect of these variables on the fluid/melt partition coefficients (D). Partition coefficients for Pb, Zn, Ag and Fe show a nearly linear increase with the chlorinity of these fluid (DPb∼6∗mCl, DZn∼8∗mCl, DAg∼4∗mCl, DFe∼1.4∗mCl, where mCl is the molinity of Cl). This suggests that these metals are dissolved primarily as Cl-complexes and neither oxygen fugacity nor the composition of the melt affects significantly their fluid/melt partitioning. By contrast, partition coefficients for Mo, B, As, Sb and Bi are highest in low salinity (1–2mol/kg Cl) fluids with maximum values of DMo∼20, DB∼15, DAs∼13, DSb∼8, DBi∼15 indicating dissolution as non-chloride (e.g., hydroxy) complexes. Fluid/melt partition coefficients of copper are highly variable, but highest between vapor like fluids and silicate melt (DCu⩽2700), indicating an important role for ligands other than Cl. Partition coefficients for W generally increase with increasing chlorinity, but are exceptionally low in some of the studied brines which may indicate an effect of other parameters. Fluid/melt partition coefficients of Sn show a high variability but likely increase with the chlorinity of the fluid (DSn=0.3–42, DW=0.8–60), and decrease with decreasing oxygen fugacity or melt peraluminosity.
Journal: Geochimica Et Cosmochimica Acta - GEOCHIM COSMOCHIM ACTA , vol. 72, no. 8, pp. 2169-2197, 2008
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    • ...Related, recent research by Zajacz et al. (2008) has also determined elevated Be concentrations in geochemically evolved, felsic melt inclusions from Ehrenfriedersdorf and from the miarolitic granites of the Baveno and Cuasso al Monte intrusions, Italy...

    R. Thomaset al. Be-daughter minerals in fluid and melt inclusions: implications for th...

    • ... However, as a siderophile element, Co is likely to behave similarly to Fe, for which partitioning data are availabl...

    Olivier Nadeauet al. Sulphide magma as a source of metals in arc-related magmatic hydrother...

    • ...Moreover, this crystallisation temperature is in reasonable agreement with entrapment conditions of 115–130 MPa/ 670–700C determined from co-existing fluid and melt inclusions in quartz from the Mt Malosa alkali granite, specifically including the root zone of quartz crystals freegrown into miarolitic pockets (Zajacz et al. 2008)...
    • ...Before concluding, we would like to recall that zircon II does not contain significant amounts of Ca, Al, or Fe (Table 2), although these elements, in particular Fe, are likely major components in the hydrothermal solution that altered the investigated zircon crystal, as indicated by analyses of fluid inclusions trapped in freely grown quartz from an alkali granite from Malawi (Zajacz et al. 2008)...

    Aneesh Somanet al. Alteration of crystalline zircon solid solutions: a case study on zirc...

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