Partitioning of Ru, Rh, Pd, Re, Ir, and Au between Cr-bearing spinel, olivine, pyroxene and silicate melts

Righter, K.; Campbell, A. J.; Humayun, M.; Hervig, R. L.

doi:10.1016/j.gca.2003.07.005

Cited by 259 publications

(140 citation statements)

References 62 publications

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“…2 and 3). These variations can be attributed to several factors, including volatile losses in subaerial and shallow submarine flows (e.g., Ireland et al, 2009;Lassiter, 2003;Norman et al, 2004;Sun et al, 2003), crystal-liquid fractionation, and crustal contamination processes (AFC) (e.g., Righter et al, 2004;Dale et al, 2008;Jamais et al, 2008;Qi and Zhou, 2008;Ireland et al, 2009;Wang et al, 2011;Zhong et al, 2011). Volatile loss can affect abundances of Re and perhaps Ir.…”

Section: Discussionmentioning

confidence: 99%

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Wang

Ren

et al. 2014

Journal of Asian Earth Sciences

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a b s t r a c tHighly magnesian lavas or picrites have the potential to preserve important information about the origin and thermochemical state of the mantle source(s) of large igneous provinces. We have conducted a comprehensive study of highly siderophile element (HSE) concentrations in picrites from the ca. 260 Ma Emeishan large igneous province. We show that HSE abundances in the Emeishan picrites are greater than those in mid-ocean ridge basalts (MORBs) and parental melts of Hawaiian picrites, but are similar to those in komatiites. The picrites have two types of C1-normalized HSE patterns: (a) type 1, as represented by the Muli picrites is similar to that of the primitive upper mantle; (b) type 2, as represented by the Dali picrites resembles East Greenland and Iceland picrites. Pt/Ir and Pd/Ir ratios in the type 2 picrites are higher than those in type 1 picrites. The primary melt compositions of the studied samples have been estimated by back-addition of equilibrium olivine. The calculated HSE abundances of the parental liquids of the Dali and Muli picrites are higher than those of the parental melts to Hawaiian picrites. Along with previously published isotopic data, our study provides further evidence for chemical heterogeneity of the Emeishan mantle plume.

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Section: Discussionmentioning

confidence: 99%

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Wang

Ren

et al. 2014

Journal of Asian Earth Sciences

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“…The authors recovered the PGM in concentrates and showed that the PGM assemblage inTrodUcTion The role of chromian spinel as an important collector of platinum-group elements (PGE) has been confirmed in investigations of the PGE content of different types of chromitites worldwide (e.g., Augé 1985, Ferrario & Garuti 1990, Pedersen et al 1993, Garuti et al 1999, Ahmed & Arai 2003. However, there is now convincing evidence that the PGE are not carried in solid solution in the chromian spinel, as had been proposed from experimental studies (e.g., Capobianco & Drake 1990, Capobianco et al 1994, Righter et al 2004, Pagé et al 2009), but form discrete platinumgroup minerals (PGM). On the basis of in situ textural observations, it has been confirmed that the PGM inclusions in unaltered chromian spinel are near-liquidus phases precipitated from the magma at a very early stage of its differentiation.…”

Section: Previous Work On the Pgm Of Milia Chromititesmentioning

confidence: 90%

Chromian Spinel Composition and Platinum-Group Element Mineralogy of Chromitites From the Milia Area, Pindos Ophiolite Complex, Greece

Kapsiotis

Grammatikopoulos

Tsikouras

et al. 2009

The Canadian Mineralogist

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The chromitites of the Milia area in the Pindos ophiolite complex, in Greece, were investigated for their platinum-group mineral (PGM) content. The chromitites are massive, more rarely disseminated in texture and occur as small pods. They are composed of magnesiochromite crystals with Cr# [Cr/(Cr + Al)] between 0.80 and 0.84, and Mg# [Mg/(Mg + Fe 2+ )] between 0.54 and 0.72. The total platinum-group-element (PGE) contents in chromitites are relatively low (≤170 ppb), although they may locally be higher (up to 1059 ppb). The IPGE (Os, Ir and Ru) predominate over the PPGE (Rh, Pt and Pd). The PGM assemblage, consistent with the geochemical data, is dominated by laurite and Os-Ir-Ru alloys that occur both as single and composite grains, generally less than 15 mm in size. Laurite has a wide range of Os-for-Ru substitution [Ru/(Ru + Os): 0.42-0.99], whereas primary alloys are enriched in Ru (up to 73.80 wt.%). Some laurite crystals exhibit an anomalous pattern of zoning. Such zoning requires an inversion of the normal T-f(S 2 ) trend in magmatic systems, and is herein considered to be due to postmagmatic processes. Some Ru-rich alloy grains contain relatively high Rh and Pt abundances, similar to those of residual sulfides in mantle peridotites. This feature suggests that these alloys may represent residual PGM phases from earlier episodes of melt extraction from the severely depleted mantle unit of the Pindos ophiolite complex. Combined compositional data indicate that the Milia chromitites formed from a hydrous boninitic melt in a suprasubduction-zone environment.Keywords: chromitites, platinum-group minerals (PGM), laurite, alloys, ophiolites, Pindos, Greece. Certains grains d'alliages riches en Ru contiennent des teneurs relativement élevées en Rh et Pt, tout comme les sulfures résiduels de péridotites du manteau. Ces grains d'alliage pourraient donc représenter des MGP résiduels après l'extraction antérieure de liquide silicaté, laissant un manteau très stérile dans le complexe ophiolitique de Pinde. Les données combinées sur la composition indiquent que les chromitites de Milia se sont formées à partir d'une magma hydraté boninitique dans un milieu au dessus de la zone de subduction.(Traduit par la Rédaction)

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“…Crystallization of chromite during an early stage of fractionation may cause the depletion of Ru, because Ru is compatible in chromite (e.g., Capobianco and Drake, 1990;Locmelis et al, 2011;Merkle, 1992;Righter et al, 2004). Negative Ru anomalies of basalts and positive Ru anomalies of ultramafic rocks and chromites elsewhere in the world all suggest a close relationship between Ru and chromite (Angeli et al, 2001;Aulbach et al, 2004;Büchl et al, 2004;Chazey and Neal, 2005;Fiorentini et al, 2004;Handler and Bennett, 1999;Lorand et al, 2004;Philipp et al, 2001;Zhou et al, 1998).…”

Section: Chromite Fractionationmentioning

confidence: 99%

Chalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China

Yang

Zhao

et al. 2011

Lithos

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Partitioning of Ru, Rh, Pd, Re, Ir, and Au between Cr-bearing spinel, olivine, pyroxene and silicate melts

Cited by 259 publications

References 62 publications

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Chemical heterogeneity of the Emeishan mantle plume: Evidence from highly siderophile element abundances in picrites

Chromian Spinel Composition and Platinum-Group Element Mineralogy of Chromitites From the Milia Area, Pindos Ophiolite Complex, Greece

Chalcophile elemental constraints on sulfide-saturated fractionation of Cenozoic basalts and andesites in SE China

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