Experiments on crystal/liquid partitioning of Ru, Rh and Pd for magnetite and hematite solid solutions crystallized from silicate melt

Capobianco, C. J.; Hervig, R. L.; Drake, M. J.

doi:10.1016/0009-2541(94)90003-5

Cited by 151 publications

(56 citation statements)

References 30 publications

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“…5). This is con sistent with experimental results for partitioning of PGEs between spinel and silicate melt (Capobianco and Drake, 1990;Capobianco et al, 1994). Although there are no data available for partitioning of PGEs and Au between pyroxene/ plagioclase and silicate liquids, Fig.…”

Section: Discussionsupporting

confidence: 87%

The behaviour of platinum-group elements during magmatic differentiation in Hawaiian tholeiites.

1999

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Concentrations of platinum-group elements (PGEs) and gold in basalts from Kilauea and Mauna Loa, Hawaii, were determined by ICP-MS, using an improved fire-assay and tellurium coprecipitation tech nique for preconcentrating the metals. Major and trace elements, together with Pb-Sr isotope compositions of basalt samples confirmed that these samples are typical Hawaiian tholeiites. The abundances of the PGEs and Au in Hawaiian tholeiites are rather constant during magmatic differentiation processes, whereas MORBs show strong fractionation of those elements. The distinctive behaviour of these PGEs in Hawaiian tholeiites cannot be explained solely via. fractionation of those elements by separation of crystallizing phases such as chromite, olivine and clinopyroxene. Oversaturation of sulfur and separation of sulfides from magmas are required for elucidating PGEs and Au concentrations in Hawaiian tholeiites.

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Section: Discussionsupporting

confidence: 87%

The behaviour of platinum-group elements during magmatic differentiation in Hawaiian tholeiites.

1999

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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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“…Both Ir and Ru are compatible in a nonsulfide phase, in which Pd is incompatible. Both petrological and geochemical studies have suggested that olivine [47,48], spinel or chromite [49,50], and refractory alloys [51,52] are the most likely candidates [7]. However, modeling calculations have shown that neither olivine nor clinopyroxene can significantly fractionate the PGEs [7].…”

Section: Journal Of Geological Researchmentioning

confidence: 99%

Different Origins of the Fractionation of Platinum-Group Elements in Raobazhai and Bixiling Mafic-Ultramafic Rocks from the Dabie Orogen, Central China

Liu

Hou

Xie

et al. 2012

Journal of Geological Research

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Concentrations of the platinum group elements (PGEs), including Ir, Ru, Rh, Pt, and Pd, have been determined for both Raobazhai and Bixiling mafic-ultramafic rocks from the Dabie Orogen by fire assay method. Geochemical compositions suggest that the Raobazhai mafic-ultramafic rocks represent mantle residues after variable degrees of partial melting. They show consistent PGE patterns, in which the IPGEs (i.e., Ir and Ru) are strongly enriched over the PPGEs (i.e., Pt and Pd). Both REE and PGE data of the Raobazhai mafic-ultramafic rocks suggest that they have interacted with slab-derived melts during subduction and/or exhumation. The Bixiling ultramafic rocks were produced through fractional crystallization and cumulation from magmas, which led to the fractionated PGE patterns. During fractional crystallization, Pd is in nonsulfide phases, whereas both Ir and Ru must be compatible in some mantle phases. We suggest that the PGE budgets of the ultramafic rocks could be fractionated by interaction with slab-derived melts and fractional crystallization processes.

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Experiments on crystal/liquid partitioning of Ru, Rh and Pd for magnetite and hematite solid solutions crystallized from silicate melt

Cited by 151 publications

References 30 publications

The behaviour of platinum-group elements during magmatic differentiation in Hawaiian tholeiites.

The behaviour of platinum-group elements during magmatic differentiation in Hawaiian tholeiites.

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

Different Origins of the Fractionation of Platinum-Group Elements in Raobazhai and Bixiling Mafic-Ultramafic Rocks from the Dabie Orogen, Central China

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