The effect of oxygen fugacity on the partitioning of Re between crystals and silicate melt during mantle melting

New constraints on the genesis and long-term stability of Os-rich alloys in the Earth’s mantle

“…Osmium was chosen because, of all of the HSE, it is the least soluble in matte. Also, unlike Re, which is known to partition into silicate phases in the upper mantle (Righter and Hauri, 1998;Mallmann and O'Neill, 2007), Os is not yet known to partition into any other mantle phases, showing only limited compatibility in Cr-spinel (e.g. Sattari et al, 2002;Pagé et al, 2012;Park et al, 2012).…”

“…Pt, Pd, Re, Au and to a lesser extent Rh behave as incompatible elements and are also more easily mobilized by low temperature metasomatic sulfide liquids (e.g. Keays et al, 1981;Fonseca et al, 2007;Mallmann and O'Neill, 2007;Brenan, 2008;Luguet et al, 2008). Os, Ir and Ru (the so-called iridium platinum group elements -IPGE), on the other hand, are strongly compatible and commonly associated with refractory sulfide phases and alloys (e.g.…”

Chemical and chronologic complexity in the convecting upper mantle: Evidence from the Taitao ophiolite, southern Chile

“…Controls on Re behavior during mantle melting appear to differ somewhat from other HSE. Several recent studies (e.g., Mallmann and O'Neill, 2007;Brenan, 2008) have suggested that Re partitioning behavior is more heavily affected by its inclusion in silicates compared to other HSE. These studies have also concluded that Re partitioning is also strongly influenced by oxygen fugacity in the melting region.…”

Formation of high-Al komatiites from the Mesoarchean Quebra Osso Group, Minas Gerais, Brazil: Trace elements, HSE systematics and Os isotopic signatures

“…Rhenium, along with the LREE, is an incompatible element that is rapidly depleted during the first stages of melting of mantle source, whereas Os is compatible. The host phases of Re are strongly dependent on oxidation state (Fonseca et al, 2007;2011;Mallmann and O'Neill, 2007), For an oxidation state around QFM, as suggested for these anomalous komatiites, Re in fertile mantle peridotite is largely hosted in sulfide and clinopyroxene (Righter et al, 2004;Mallmann and O'Neill, 2007;Fonseca et al, 2007;Brenan, 2008), and is completely extracted from mantle residues at ~20% of partial melting.…”