Oxides of the Pd-Sb-Bi system from the Chiney Massif (Aldan Shield, Russia)

Tolstykh, Nadezhda D.; Krivenko, Aleksandr P.; Lavrent'Ev, Yuriy G.; Tolstykh, Oleg N.; Korolyuk, V. N.

doi:10.1127/0935-1221/2000/0012-0431

Cited by 13 publications

(9 citation statements)

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“…The Pd-based oxide grains appear to be more diverse in their compositions than grains of Ru-Os-Ir-rich oxides. Indeed, the Pd-rich grains contain a variety of elements, e.g., Sb, Bi, Pb, and Tl [25][26][27], which could well reflect diverse precursor grains.…”

Section: Zoned Oxide Of Pge-fementioning

confidence: 99%

Mineralogy of Platinum-Group Elements and Gold in the Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia

et al. 2018

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Abstract:We describe assemblages of platinum-group minerals (PGM) and associated PGE-Au phases found in alluvium along the River Bolshoy Khailyk, in the western Sayans, Russia. The river drains the Aktovrakskiy ophiolitic complex, part of the Kurtushibinskiy belt, as does the Zolotaya River~15 km away, the site of other placer deposits. Three groups of alloy minerals are described: (1) Os-Ir-Ru compositions, which predominate, (2) Pt-Fe compositions of a Pt 3 Fe stoichiometry, and (3) Pt-Au-Cu alloys, which likely crystallized in the sequence from Au-(Cu)-bearing platinum, Pt(Au,Cu), Pt(Cu,Au), and PtAuCu 2 , to PtAu 4 Cu 5 . The general trends of crystallization of PGM appear to be: [Os-Ir-Ru alloys] → Pt 3 Fe-type alloy (with inclusions of Ru-dominant alloy formed by exsolution or via replacement of the host Pt-Fe phase) → Pt-Au-Cu alloys. We infer that Rh and Co mutually substitute for Fe, not Ni, and are incorporated into the pentlandite structure via a coupled mechanism of substitution: [Rh 3+ + Co 3+ + → 3Fe 2+ ]. Many of the Os-Ir-Ru and Pt-Fe grains have porous, fractured or altered rims that contain secondary PGE sulfide, arsenide, sulfarsenide, sulfoantimonide, gold, Pt-Ir-Ni-rich alloys, and rarer phases like Cu-rich bowieite and a Se-rich sulfarsenide of Pt. The accompanying pyroxene, chromian spinel and serpentine are highly magnesian, consistent with a primitive ultramafic source-rock. Whereas the alloy phases indicate a highly reducing environment, late assemblages indicate an oxygenated local environment leading to Fe-bearing Ru-Os oxide (zoned) and seleniferous accessory phases.

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Section: Zoned Oxide Of Pge-fementioning

confidence: 99%

Mineralogy of Platinum-Group Elements and Gold in the Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia

et al. 2018

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“…Therefore, they are grouped among the socalled noble metals. However, it has been suggested (Cabri et al 1981, Olivo & Gauthier 1995, Nixon et al 1990, Legendre & Augé 1993, Jedwab & Cassedanne 1998, Barkov et al 1999, 2012, McDonald et al 1999, Weiser & Bachmann 1999, Tolstykh et al 2000, Oberthür et al 2003, Cabral et al 2004, Jedwab 2004, Zaccarini et al 2004, Melcher et al 2005, Shcheka et al 2005, Tsoupas & Economou-Eliopoulos 2007, Proenza et al 2007, 2008, Uysal et al 2009, 2012, Kapsiotis et al 2011, Tuisku 2012) that under the appropriate physical-chemical conditions in the natural environment, PGE may form PGE-bearing oxides and hydrated oxides, thus implying that they do not always behave as noble elements. These PGE oxide compounds, if they exist, are rare in nature and most have been reported from alluvial placers.…”

Section: Introductionmentioning

confidence: 95%

Ruthenium and Magnetite Intergrowths From the Loma Peguera Chromitite, Dominican Republic, and Relevance to the Debate Over the Existence of Platinum-Group Element Oxides and Hydroxides

Zaccarini

Bindi

Garuti

et al. 2014

The Canadian Mineralogist

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Two small grains, about 50 × 60 × 70 μm in size, occurring in the chromitite associated with the altered harzburgite of Loma Peguera (Dominican Republic) have been investigated by electron microprobe analyses, X-ray computed tomography, and X-ray diffraction. Electron microprobe data indicate the grains to be composed of Ru, Os, Ir, Fe, and O. The obtained composition is similar to those reported from podiform chromitites worldwide and often reported as evidence for the existence of PGE-bearing oxide minerals. X-ray computed tomography and X-ray diffraction data, provided for the first time in this study, reveal that the Loma Peguera grains consist of a fine intergrown of ruthenium and magnetite not detectable at the scale of the electron microprobe. We believe that the investigated grains were originally laurite, ideally (Ru,Os)S 2 , crystallized during the magmatic stage. During alteration processes at low temperature, the mineral lost its original S, which transformed the laurite to ruthenium. The newly formed ruthenium was probably porous and, during the final stage of the alteration process, oxidizing fluids enriched in Fe filled the cavities leading to the subsequent crystallization of magnetite.

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“…In the following years, PGE oxides were identified in many ophiolite massifs (Garuti and Zaccarini, 1997;McDonald et al, 1999) and mantles of weathering covering large layered plutons Oberthür et al, 2002Oberthür et al, , 2004. Pd oxides were found in laterite-hosted gold deposits of Brazil (Cabral et al, 2001) and as products replacing Pd stibioarsenides in layered plutons (Tolstykh et al, 2000;Grokhovskaya et al, 2002Grokhovskaya et al, , 2003. In ore concentrates of the Ural chromite deposit, Jedwab (2004) described PGE oxides, which were attributed to natural compounds rather than to products of metallurgical processing.…”

Section: Introductionmentioning

confidence: 95%

Assemblages and genesis of platinum-group minerals in low-sulfide ores of the monchetundra deposit, Kola Peninsula, Russia

2009

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New data on the composition, assemblages, and formation conditions of platinum-group minerals (PGM) identified in platinum-group element (PGE) occurrences of the Monchetundra intrusion (2495 ± 13 to 2435 ± 11 Ma) are described. This intrusion is a part of the Paleoproterozoic pluton of the Monche-ChunaVolch'i and Losevy tundras located in the Pechenga-Imandra-Varzuga Rift System. The rhythmically layered host rocks comprise multiple megarhythms juxtaposed to mylonite zones and magmatic breccia and injected by younger intrusive rocks in the process of intense and long magmatic and fluid activity in the Monchetundra Fault Zone. The primary PGM and later assemblages that formed as a result of replacement of the former have been identified in low-sulfide PGE occurrences. More than 50 minerals and unnamed PGE phases including alloys, Pt and Pd sulfides and bismuthotellurides, PGE sulfarsenides, and minerals of the Pd-As-Sb, Pd-Ni-As, and PdAg-Te systems have been established. The unnamed PGE phases-Ni 6 Pd 2 As 3 , Pd 6 AgTe 4 , Cu 3 Pt , Pd 2 NiTe 2 , and ( Pd , Cu ) 9 Pb ( Te , S ) 4 -are described. The primary PGM were altered due to the effect of several mineral-forming processes that resulted in the formation of micro-and nanograins of Pt and Pd alloys, sulfides, and oxides, as well as in the complex distribution of PGE, Au, and Ag mineral assemblages. New types of complex Pt and Pd oxides with variable Cu and Fe contents were identified in the altered ores. Pt and Pd oxides as products of replacement of secondary Pt-Pd-Cu-Fe alloys occur as zonal and fibrous nanoscale Pt -Pd -Cu -Fe -( ± S )-O aggregates.

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Oxides of the Pd-Sb-Bi system from the Chiney Massif (Aldan Shield, Russia)

Cited by 13 publications

References 0 publications

Mineralogy of Platinum-Group Elements and Gold in the Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia

Mineralogy of Platinum-Group Elements and Gold in the Ophiolite-Related Placer of the River Bolshoy Khailyk, Western Sayans, Russia

Ruthenium and Magnetite Intergrowths From the Loma Peguera Chromitite, Dominican Republic, and Relevance to the Debate Over the Existence of Platinum-Group Element Oxides and Hydroxides

Assemblages and genesis of platinum-group minerals in low-sulfide ores of the monchetundra deposit, Kola Peninsula, Russia

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