Ore mineralogy of PGM placers in Siberia and the Russian Far East

Tolstykh, Nadezhda D.; Krivenko, Aleksandr P.; Sidorov, Evgeny G.; Laajoki, K.; Podlipsky, M. Yu.

doi:10.1016/s0169-1368(02)00036-7

Cited by 34 publications

(21 citation statements)

References 12 publications

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“…Furthermore, the changes in the platinum-group minerals occurring during their transport from a lode source to a placer were not studied in detail. Despite the significant amount of work devoted to the Koryak-Kamchatka region, as well as the Bushveld complex and the Great Dyke (South Africa), where the formation of the platinum placers [18][19][20][21][22][23][24] was investigated in detail, similar studies of the Ural Platinum Belt placers have not been conducted yet.…”

Section: Introductionmentioning

confidence: 99%

Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia

et al. 2019

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The alteration of platinum group minerals (PGM) of eluval, proximal, and distal placers associated with the Ural-Alaskan type clinopyroxenite-dunite massifs were studied. The Isovsko-Turinskaya placer system is unique regarding its size, and was chosen as research object as it is PGM-bearing for more than 70 km from its lode source, the Ural-Alaskan type Svetloborsky massif, Middle Urals. Lode chromite-platinum ore zones located in the Southern part of the dunite "core" of the Svetloborsky massif are considered as the PGM lode source. For the studies, PGM concentrates were prepared from the heavy concentrates which were sampled at different distances from the lode source. Eluvial placers are situated directly above the ore zones, and the PGM transport distance does not exceed 10 m. Travyanistyi proximal placer is considered as an example of alluvial ravine placer with the PGM transport distance from 0.5 to 2.5 km. The Glubokinskoe distal placer located in the vicinity of the Is settlement are chosen as the object with the longest PGM transport distance (30-35 km from the lode source). Pt-Fe alloys, and in particular, isoferroplatinum prevail in the lode ores and placers with different PGM transport distance. In some cases, isoferroplatinum is substituted by tetraferroplatinum and tulameenite in the grain marginal parts. Os-Ir-(Ru) alloys, erlichmanite, laurite, kashinite, bowieite, and Ir-Rh thiospinels are found as inclusions in Pt-Fe minerals. As a result of the study, it was found that the greatest contribution to the formation of the placer objects is made by the erosion of chromite-platinum mineralized zones in dunites. At a distance of more than 10 km, the degree of PGM mechanical attrition becomes significant, and the morphological features, characteristic of lode platinum, are practically not preserved. One of the signs of the significant PGM transport distance in the placers is the absence of rims composed of the tetraferroplatinum group minerals around primary Pt-Fez alloys. The sie of the nuggets decreases with the increasing transport distance. The composition of isoferroplatinum from the placers and lode chromite-platinum ore zones are geochemically similar.

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Section: Introductionmentioning

confidence: 99%

Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia

et al. 2019

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“…7). The data points define a ruthenium-enrichment trend line, typical of the sources of ophiolite type, and identified as their characteristic feature in Krivenko & Tolstykh (1994) and Tolstykh et al (2002Tolstykh et al ( , 2005. The concentration of Ru in Os-Ir-Ru alloy reaches up to 63 at.%.…”

Section: Os-ir-ru Alloysmentioning

confidence: 89%

Platinum-Group Minerals From the Olkhovaya-1 Placers Related to the Karaginsky Ophiolite Complex, Kamchatskiy Mys Peninsula, Russia

Tolstykh¹,

Sidorov²,

Kozlov³

2009

The Canadian Mineralogist

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Mineral assemblages from the Olkhovaya-1 River placers, in Kamchatka, Far-Eastern Russia, provide genetic information on their evolution. The minerals are dominated by Os-Ir-Ru alloys (80%), consisting of all possible mineral species, and Pt-Fe alloys consisting of native platinum, Fe-rich platinum and isoferroplatinum. The following features of the mineral assemblage are characteristic of mineralization associated with an ophiolitic complex: (1) in the Os-Ru-Ir diagram, the compositions of the hexagonal alloy form a ruthenium trend; (2) there are two typical equilibrium magmatic parageneses of alloys: early osmiumiridium, and later isoferroplatinum-ruthenium, which both are associated with laurite and the solid solution laurite-irarsite (Ru,Ir) (S,As) 2 . The cooperite, sperrylite and Pd minerals formed at the postmagmatic stage. Tetraferroplatinum-tulameenite, replacing the Pt-Fe alloys, as well as the multicomponent compounds of Ru, Os, Ir, Rh, Pt with Fe replacing the Os-Ir-Ru alloys and PGE sulfides, result from serpentinization of PGM-bearing rocks. The PGM assemblage in the Ol'khovaya-1 River placers is related to the Karaginsky ophiolite complex of the Kamchatskiy Mys Peninsula.Keywords: platinum-group minerals, ophiolitic rocks, iridium-osmium paragenesis, isoferroplatinum-ruthenium paragenesis, Kamchatskiy Mys Peninsula, Russia. SOmmaiReLes assemblages de minéraux prélevés dans les placers de la rivière Olkhovaya-1, au Kamchatka, en Russie orientale, contiennent de l'information génétique concernant leur évolution. Les alliages Os-Ir-Ru sont les minéraux prédominants (80%); nous reconnaissons toutes les espèces connues. Parmi les alliages Pt-Fe, nous trouvons le platine natif, le platine riche en fer, et l'isoferroplatine. Les caractéristiques suivantes indiquent une minéralisation associée à un complexe ophiolitique: (1) dans le diagramme Os-Ru-Ir, les compositions de l'alliage hexagonal définissent un tracé d'enrichissement en ruthénium; (2) nous trouvons deux paragenèses magmatiques typiques parmi les alliages, osmium-iridium précoce et isoferroplatine-ruthénium tardif, les deux étant associés à la laurite et à la solution solide laurite-irarsite (Ru,Ir)(S,As) 2 . La cooperite, la sperrylite et les minéraux de Pd se sont formés à un stade postmagmatique. L'association tétraferroplatine-tulameenite, qui remplace les alliages Pt-Fe, ainsi que les composés à multi-composantes Ru, Os, Ir, Rh, Pt avec Fe, qui remplacent les alliages Os-Ir-Ru et les sulfures des éléments du groupe du platine, résulteraient de la serpentinisation des roches porteuses des minéraux du groupe du platine. Ces minéraux dans les placers de la rivière Ol'khovaya-1 proviendraient du massif ophiolitique de Karaginsky, qui affleure sur la péninsule de Kamchatskiy Mys.(Traduit par la Rédaction) Mots-clés: minéraux du groupe du platine, roches ophiolitiques, paragenèse iridium-osmium, paragenèse isoferroplatine-ruthé-nium, péninsule Kamchatskiy Mys, Russie. §

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“…The compositions of other PGM, including Pt-oxide (hydroxide) were determined by Scanning Electron Microscope (SEM). isoferroplatinum-osmium and isoferroplatinum-iridium paragenesisses, which are typical for Ural-Alaskan type intrusions (Tolstykh et al, 2002(Tolstykh et al, , 2005. A paragenetic link with osmium is dominant in the Svetly Bor intrusion.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Platinum mineralization of the Svetly Bor and Nizhny Tagil intrusions, Ural Platinum Belt

Tolstykh

Kozlov

Telegin³

2015

Ore Geology Reviews

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Ore mineralogy of PGM placers in Siberia and the Russian Far East

Cited by 34 publications

References 12 publications

Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia

Platinum-Group Minerals of Pt-Placer Deposits Associated with the Svetloborsky Ural-Alaskan Type Massif, Middle Urals, Russia

Platinum-Group Minerals From the Olkhovaya-1 Placers Related to the Karaginsky Ophiolite Complex, Kamchatskiy Mys Peninsula, Russia

Platinum mineralization of the Svetly Bor and Nizhny Tagil intrusions, Ural Platinum Belt

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