Localization of PGE mineralization in southeastern Russia

Abstract

Southeastern Russia occupies an area south of the Siberian Platform and east of Lake Baikal, up to the coasts of the Sea of Okhotsk and the Sea of Japan. Most of PGE placers are localized south of the Siberian Platform, mainly within the Baikal-Aldan-Stanovoi megablock. Noble-metal placers formed by PGE minerals in varying amounts are associated with the regional mafic-ultramafic complexes of different ages, namely, layered, zoned (ring) massifs and ophiolite fields. PGE mineralization is also found in layered carbonaceous strata of different ages and in several brown-coal deposits localized in the Cenozoic zones of dispersed rifting and intraplate magmatism. One of the magmatism centers is the Ussuri plume structure. The widespread regional manifestations of plume magmatism of different ages permit the development of a new approach to study the additional factors that affected the formation and localization of PGE mineralization. Based on geological, geophysical, geochemical, and mineralogical data, we have established that the conditions favorable for the formation of platinum-bearing deposits were mainly due to ore-generating plume magmatism. This magmatism gave rise to layered (in the Neoarchean and Proterozoic) and zoned (in the Phanerozoic) mafic-ultramafic massifs, which were later subjected to ore-producing magmatogene-fluid-metasomatic processes. The most favorable conditions for PGE concentration appeared in zones where late granite deposits were superposed on early layered, zoned massifs, ophiolite complexes, and layered carbonaceous strata.

Modelling of geodynamic regimes of precious metal‐bearing porphyry deposits: Lazurnoe deposit (Sikhote–Alin Belt, Far East) case study

“…Positions of platinum and gold objects in the tectonic structure of East Asia (after Hart et al, 2002; Zhang et al, 2003; Khomich & Boriskina, 2007, 2014; Khomich et al, 2014) [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…The chain of PGE‐bearing ultramafic massifs of zonal composition in the East Asian region can be traced along the northern border of the stagnant slab projection (Figure 1) (Distler et al, 1996; Kazachenko, Miroshnichenko, Perevoznikova, & Karabtsov, 2009; Khanchuk, Plyusnina, & Molchanov, 2004; Seredin, 2004). The correspondence between PGE deposits and slab margins has attracted researchers' attention to the regularities between mantle geodynamics and ore prospectivity (Khomich & Boriskina, 2014). Such regularities were further confirmed and extended onto Au deposits by many researchers (Khanchuk et al, 2019, 2020; Khomich et al, 2019).…”

“…Analysis of regional geodynamic and metallogenic data for the Asia–Pacific convergence zone has shown that the prospectivity for precious metal deposits of ore‐bearing objects larger than ore districts, covering 10 2 –10 4 km 2 (Khomich, 1986), is mainly influenced by deep‐seated processes (Khanchuk et al, 2019, 2020; Khomich et al, 2014; Khomich & Boriskina, 2014; Shevyrev, Khomich, & Boriskina, 2017). However, the analysis of prospectivity of ore‐bearing objects smaller than ore districts demands a special methodological approach because, during mineral deposit formation, the complexity of geological processes involved and their interactions with each other are far greater than in ore‐bearing objects larger than ore districts.…”

Upgrading of raw vanadium titanomagnetite concentrate

“…Vanadium titanomagnetite deposits are widely distributed around the world. Vanadium titanomagnetite usually contains valuable elements such as Fe, V, and Ti; rare and noble metals such as Co, Tc, Ga, Pt, and Pd can also be present (Chen et al, 2015;Zhu, Li, and Guan, 2016;Khomich and Boriskina,.2014;Luo et al, 2013). Therefore, considerable value can be realized through comprehensive utilization of the ore.…”

Investigation on an Effective Magnetic Permeability of the Rod-Shaped Ferrites

“…1 has been obtained and still used by ferrite manufacturers [2,3]. Around the same period, Khomich [4] published an equation which describes these curves based on measurement results:…”