Molybdenum, tungsten and manganese partitioning in the system pyrrhotite–Fe–S–O melt–rhyolite melt: Impact of sulfide segregation on arc magma evolution

Chalcophile and siderophile elements in sulphide inclusions in eclogitic diamonds and metal cycling in a Paleoproterozoic subduction zone

“…In addition, this suggests that W was not mobilised from the subducted Paleoproterozoic oceanic gabbro. By contrast, eclogitic sulphide alone roughly balances the Mo budget of global MORB, in agreement with recent partitioning data showing $3 Â 10 4 greater Mo partitioning into sulphide vs silicate melt than W (Mengason et al, 2011).…”

Effects of temperature, silicate melt composition, and oxygen fugacity on the partitioning of V, Mn, Co, Ni, Cu, Zn, As, Mo, Ag, Sn, Sb, W, Au, Pb, and Bi between sulfide phases and silicate melt

“…The time required for V, Mn, Co, Ni, Cu, Zn, As, Mo, Ag, Sn, Sb, W, Au, Pb, and Bi to attain equilibrium partitioning between sulfide phases and silicate melt has been shown to be short (Mengason et al, 2011;Li and Audétat, 2012;Zajacz et al, 2013;Kiseeva and Wood, 2013 (Mengason et al, 2011;Li and Audétat, 2012;Zajacz et al, 2013). Additional lines of evidence supporting equilibrium partitioning in this study are as follows: (1) Both silicate melt and sulfide phases are compositionally homogeneous with respect to major and trace elements, (2) experiments of variable durations that were (3) there is generally a good agreement between the partition coefficients obtained in this study and those determined on both natural and synthetic samples in previous studies (see below).…”

“…The ore metals present in these deposits have been demonstrated to be derived mainly from the related magmas; however, there is considerable dispute regarding the factors which produce the observed variability in ore metal ratios such as Cu/Au, Cu/Mo, W/Mo, and W/Sn (Candela, 1997;Halter et al, 2002Halter et al, , 2005Richards, 2009;Mengason et al, 2011;Audétat and Simon, 2013;Li and Audétat, 2013). The absolute metal concentrations and metal ratios in an individual porphyry-type ore deposit depends on several factors including the metal content of the parental magma, fluid-melt partition coefficients, and efficiency of metal precipitation (Candela and Holland, 1986;Candela, 1997;Audétat et al, 2008;Simon and Ripley, 2011).…”

“…So far no partitioning data of Cu, Au, and Ag between sulfide liquid and intermediate to felsic melts are available. Moreover, studies dealing with the partition coefficients of other ore metals such as W, Mo, Sn, Pb, Zn, and Bi between sulfide phases and intermediate to felsic melts are sparse: Mengason et al (2011) determined the partition coefficients of W and Mo between sulfide liquid, MSS (pyrrhotite), and rhyolitic melt at 1042°C and 1 bar, and Sun et al (2014) reported data that allow calculation of D MSS=SM Mo values in rhyolitic melts. This contribution aims at determining systematically the partition coefficients of V, Mn, Co, Ni, Cu, Zn, As, Mo, Ag, Sn, Sb, W, Au, Pb, and Bi between sulfide liquid, MSS, and silicate melt as a function of temperature (900-1200°C), silicate melt composition (basalt to rhyolite), and oxygen fugacity ($FMQÀ2 to FMQ+3) at 0.5-1.5 GPa.…”

The formation of the Caosiyao giant porphyry Mo deposit on the northern margin of the North China Craton: Constraints from U―Pb and Re―Os geochronology, whole‐rock geochemistry, Hf isotopes, and oxygen fugacity of the magma

“…An elevated oxygen fugacity will facilitate the extraction of Mo into melt owing to the much higher solubility of S as sulphate (SO 4 2− ) than sulphide (S 2− ; Carroll & Rutherford, ), and the exsolved fluids from such oxidized magmas are likely to have higher Mo contents. Rayleigh fractionation modelling (Mengason, Candela, & Piccoli, ) indicates that oxidized magmas (magmatic oxygen fugacities > NNO [Ni‐NiO buffer]) may have lost as much as 14% of their initial molybdenum through fractional crystallization, whereas reduced melts (magmatic oxygen fugacities < NNO–0.5) may have lost 90% of their initial molybdenum. Oxidized magmas therefore have the potential for forming relatively large Mo deposits.…”