Platinum mineralization of the Svetloborsky and Kamenushinsky massifs (Urals Platinum Belt)

Abstract

Platinum mineralization has been studied within two zoned clinopyroxenitedunite massifs of the Urals Platinum Belt. Within the Svetloborsky massif, platinum group minerals (PGM) occur directly in serpentinized dunite. The ore-forming system demonstrates the features of an early evolutionary stage: a significant portion of PtFe alloys belongs to ferroan platinum; native osmium is depleted in Ir; an isoferroplatinumosmium paragenesis is present. Within the Kamenushinsky massif, PGM are genetically related to chromitite and belong to the late-magmatic stage of the ore-forming system evolution: osmium and isoferroplatinum are rich in Ir; both isoferroplatinumosmium and isoferroplatinumiridium magmatic parageneses are present. The elevated Pt in the dunite of the Svetloborsky massif and in the chromitite of the Kamenushinsky massif is the result of two events: the primary-magmatic crystallization of PGM and later hydrothermal overprint.

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

“…The observed existence of Sb-for-As substitution is especially noteworthy (Figure 9, [16]. Tolovkite from its type locality, the alluvial placers of the Tolovka River zone associated with the Alpine-type Ust'-Belskiy complex, Magadanskaya oblast, Russia, is close to its end-member composition, IrSbS [17].…”

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

“…The zone is a linear stockwork with an intensely serpentinized dunite substrate with numerous dykes, lenticular bodies, and veins of pyroxenite, hornblendite and isite (local name, fine-grained melanocratic vein variety of hornblendite named after the river Is in the Urals, Russia). Here, the chromites do not form significant concentrations, and the platinum-group minerals are found directly in the olivine-serpentine matrix without any spatial connection to the chromites [9].…”

“…Two types of lode platinum mineralization are distinguished within the Svetloborsky massif, (1) Platinum-bearing dunites and (2) chromite-platinum mineralization. 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].…”

“…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.…”

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

“…The Svetly Bor intrusion is also intruded by dykes of clinopyroxenite and hornblendite. A platinum occurrence was discovered in 2003 in the southwestern part of the Svetly Bor intrusion within the peripheral zone of dunite at the contact with clinopyroxenite marginal phase (Telegin et al, 2009;Tolstykh et al, 2011). The Pt-rich dunite zone is up to 170 m in width and more than 1.3 km in length, and the grade within the zone varies between 0.1 and 3.0 ppm reaching 20.0 ppm in some samples.…”