Platinum-Group Minerals from the Durance River Alluvium, France

Johan, Zdeněk; Ohnenstetterl, M.; Fischer, Markus; Amosse, J.

doi:10.1007/bf01162696

Cited by 52 publications

(28 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The Pt-Cu rims were formed as a result of a hydrothermal-metasomatic process, rather than from a change in conditions of magmatic crystallization. The above-mentioned individual features of the ore-forming system differ from those exhibited in the Durance (Johan et al 1990) and Konder (Nekrasov et al 1994) examples, where the level of Pd does correlate with Cu, and a Pt-Pd-Cu alloy does occur.…”

Section: Discussion: Chemical Features Of the Ore-forming Systemmentioning

confidence: 66%

“…Perhaps it formed at a lower temperature than 800°C. A similar phase, (Pt,Pd,Rh,Os, Au,Cu) 3 S 2 , was found in eastern Madagascar , and (Pt,Cu,Rh,Pt) 3 S 2 was reported in an inclusion in platinum in the Durance River placer (Johan et al 1990). …”

Section: Pt -Pd -Base Metal Sulfidesmentioning

confidence: 90%

“…The phases filling the cavities in platinum nuggets from the Pustaya River are the products of decomposition of high-temperature base-metal sulfide solid-solutions: monosulfide Me 1-x S (Mss), intermediate Me 1+x S (Iss) and bornite (Bn ss ) solid-solutions, of which Iss is the main concentrator of the light PGE (Peregoedova & Ohnenstetter, in press). Microparageneses of multiphase inclusions in Pt-Fe alloy composed of vysotskite, palladian cooperite, vasilite, and other sulfides of Pt and Pd in a chalcopyrite-bornite matrix occur rather commonly in other Alaskan-type sources at Durance, France (Johan et al 1990), in placers of Siberia (Tolstykh & Krivenko1994), in southern Burma (Hagen et al 1990), for example. The difference is only in the degree of isomorphous substitution, and the variable stoichiometry of sulfides from low-sulfide (vasilite) to high-sulfide (malanite), depending on local sulfur fugacity at the time of their crystallization.…”

Section: Discussion: Chemical Features Of the Ore-forming Systemmentioning

confidence: 99%

“…Platinumcopper alloys compositionally similar to Pt 3 Cu were earlier described in the placers of eastern Madagascar . Compositions richer in Cu were found in the Durance River placers, in France (Johan et al 1990), Tulameen, British Columbia (Nixon et al 1990), and in the Lukkulaisvaara massif, Russia (Barkov et al 1992). …”

Section: Platinum-group Minerals From the Placersmentioning

confidence: 99%

See 3 more Smart Citations

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

Tolstykh¹,

Sidorov²,

Laajoki³

et al. 2000

The Canadian Mineralogist

View full text Add to dashboard Cite

We have studied the platinum-group minerals (PGM) recovered from the Pustaya River placer deposit, situated within the Koryak-Kamchatka platinum-bearing belt of Alaskan-type intrusions in eastern Russia. The specific features of the geochemistry of the PGM of this placer deposit characterize the ore-forming system in the Alaskan-type source, which was partly eroded. The PGM concentrate (160 grains) consists of platinum nuggets, except for two grains, an iridium nugget and Pd-bearing gold (15.18% Pd). The platinum nuggets are represented by native platinum, isoferroplatinum and Pt-Fe alloy with an elevated concentration of Pd (up to 9.52 wt.%). Some nuggets are surrounded by rims of PtCu, Pt 3 Cu, or PtS composition. Osmium, cooperite, vysotskite, platarsite, hollingworthite, irarsite, sperrylite, keithconnite, stibiopalladinite, rhodarsenide, vasilite, rhodian pyrrhotite and unnamed phases Pd 2 Te, (Pt,Pd) 3 S 2 , (Pt,Pd,Fe,Cu) 3 S, and (Cu,Fe,Pd,Pt,Rh) 9 S 8 occur as inclusions in the platinum nuggets. The oreforming system is characterized by a depletion in Os, Ir, and Ru, and enrichment in Pd and Cu at the late-magmatic stage and Cu at the hydrothermal-metasomatic stage. Enrichment of the melt in Pd produced Pd-rich Pt-Fe alloys. Residual portions of the melt enriched in S, Pd and Cu filled gas vacuoles in platinum nuggets, in which the further crystallization of multi-phase parageneses [vysotskite, vasilite, (Pt,Pd) 3 S 2, (Pt,Pd,Fe,Cu) 3 S, (Cu,Fe,Pd,Pt,Rh,Ru) 9 S 8, bornite and chalcopyrite] occurred. Further hydrothermal-metasomatic transformations led to the appearance of hongshiite and cooperite rims on platinum.

show abstract

Section: Discussion: Chemical Features Of the Ore-forming Systemmentioning

confidence: 66%

Section: Pt -Pd -Base Metal Sulfidesmentioning

confidence: 90%

Section: Discussion: Chemical Features Of the Ore-forming Systemmentioning

confidence: 99%

Section: Platinum-group Minerals From the Placersmentioning

confidence: 99%

See 2 more Smart Citations

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

Tolstykh¹,

Sidorov²,

Laajoki³

et al. 2000

The Canadian Mineralogist

View full text Add to dashboard Cite

show abstract

“…Although inclusions of platinum-group minerals in gold-rich alloys are rarely reported, the observatitm of such a case in the alluvium of the Durance River, France (Johan et at.. 1990), where the gold contains -2 (inisized inclusitin.s enriched in Ni, Pt and Sn and up to -3 weight '1 of Sn, shows thai the Merensky Reef is not unique and that a systematic search for such inclusions might reveal more examples.…”

Section: Mineralogymentioning

confidence: 99%

Compositional and textural peculiarities of gold-rich alloys from the Merensky Reef

Merkle

Grote

Gräser

2008

South African Journal of Geology

View full text Add to dashboard Cite

Gold-rich alloys with variable ¡imounrs of Pd from the Merensky Reef, Bushveld Complex, are charatterized by a range of finely dispersed inclusions. The small sizes of these inclasions (median of 1,85 fJLin) make fiilly quantitative analyses virtually impossible. Tentative interpretation of semi-quantitative microprobe analyses demonstrates the presence of atokite. kotulskite, laurite, moncheice, niggliite, paolovlte, rustenburgite, sobolevskite, and spenylite. Some inclusions appear to represent unnamed minerals.Textures and assemblages imply that these gold grains and their inclusions formed from Huids through occasional remobilisation and co-precipitation.

show abstract

From3DIntermetallic Antiperovskites to2DHalf Antiperovskites

Weihrich

Köhler

Pielnhofer

et al. 2017

Encyclopedia of Inorganic and Bioinorganic Chemistry

View full text Add to dashboard Cite

The concept of ordered half antiperovskites (HAP) derives A 2 M 3 X 2 structures formally from metal‐rich intermetallic antiperovskites AM 3 X such as MgNi 3 C. It was developed within the last decade in Regensburg accompanied by fascinating discoveries of other groups. It extends the idea known for oxide structures related to perovskite such as cuprate superconductors: therein, the 3D M‐O network is cut to 2D sheets, that is YBaCu 2 O 7‐d . By systematic formation of unoccupied sites 3D interlinked MO 6 octahedra in perovskites are cut to 2D substructures with CuO 4 and CuO 5 units. To the best of our knowledge, a similar scheme was not described for antiperovskites AM 3 X, where X and M sites of perovskites are exchanged. MgNi 3 C is taken subsequently as reference example. First reported by Hütter and Stadelmaier it became famous as noncuprate nonoxide superconductor. We show that MX 6 and XM 6 units in perovskites AMX 3 and APs AM 3 X can be cut to MX 3 and XM 3 units to form 2D structures. The situation compares to gray As and black P that are derived from a primitive α‐Po structure by cutting three of the six bonds. In both cases, interlinked 3D networks are cut to 2D structures. However, the ternary compounds introduce additional degrees of freedom by varying the electron count by composition that turns out important to design properties such as for example magnetism and thermoelectrics of superconductivity. Consequently, the HAP concept consists of a crystal structure part for compounds A 2 M 3 X 2 = AM 3/2 L 3/2 X with AP superstructures and an electronic structure part. In this review, we point out relations to antiperovskite AM 3 X crystal and electronic structures, the history of A 2 M 3 X 2 compounds, the HAP concept, important discoveries of HAP materials and novel investigations on synthesis, spintronics, thermoelectrics, superconductors, and topological properties. Advantages of the given conceptual view are pointed out for computer modeling, design, and prediction of structures and functions.

show abstract

Platinum-Group Minerals from the Durance River Alluvium, France

Cited by 52 publications

References 8 publications

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

The Association of Platinum-Group Minerals in Placers of the Pustaya River, Kamchatka, Russia

Compositional and textural peculiarities of gold-rich alloys from the Merensky Reef

From3DIntermetallic Antiperovskites to2DHalf Antiperovskites

Contact Info

Product

Resources

About