Platinum group element mineralization of the Svetly Bor and Veresovy Bor clinopyroxenite–dunite massifs, Middle Urals, Russia

Stepanov, S; Malitch, K. N.; Козлов, А. В.; Badanina, I. Yu.; Антонов, А. В.

doi:10.1134/s1075701517030060

Cited by 15 publications

(15 citation statements)

References 9 publications

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“…The first type of mineralization was described in detail by N. D. Tolstykh et al [9]. The parameters of chromite-platinum mineralization are given in Reference [14].…”

Section: Geological Settingmentioning

confidence: 99%

“…These zones are located in the fine to medium-grained dunite transition zone with platinum in the concentration range from two to 50 g/t. The majority of individual grains and aggregates of platinum-group minerals in such zones are spatially associated with chromitite segregations [14]. To the West of the Vershinniy exploration site, in the vicinity of the contact between the dunite core and pyroxenites, the Vysotsky site is located, where platinum-bearing dunites were observed.…”

Section: Geological Settingmentioning

confidence: 99%

“…All studied placers belong to a single connected drainage system. The section of modern sediments of the Vershinniy exploration site (Figure 1b) overlapping the allocated chromite-platinum zone is given as an example of eluvial placer [14]. The structure, characteristics and composition of the PGM assemblages from this placer were described in detail earlier [25].…”

Section: Geological Settingmentioning

confidence: 99%

“…The platinum-group minerals from the bedrock are characterized by a variety of surfaces. Idiomorphic cubic crystals with sizes less than 50 µm, described for different types of lode mineralization, are distinguished [9,14], as well as relatively large aggregates cementing the chromit grains, rarely exceeding 1 mm in size. Xenomorphic grains of similar size with dissolved surfaces are found in the dunite type of mineralization.…”

Section: Morphological Featuresmentioning

confidence: 99%

“…However, for almost 200 years of industrial history of the Ural placer deposit development, only the Solovyeva Mountain lode deposit of the Nizhnetagilsky massif was discovered [3]. At the same time, despite the obvious industrial significance of placers, clinopyroxenite-dunite massifs were studied to a greater extent [4][5][6][7][8][9][10][11][12][13][14]. The last comprehensive work on the geology of placers and the conditions of their formation, as well as platinum-group mineral (PGM) assemblages is the work of N. K. Vysotsky [2], published at the beginning of the last century.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The first type of mineralization was described in detail by N. D. Tolstykh et al [9]. The parameters of chromite-platinum mineralization are given in Reference [14].…”

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Section: Morphological Featuresmentioning

confidence: 99%