| Abstract: | Genetic and mineralogical features of large deposits with complex Sn, W, and Mo mineralization in the Sikhote-Alin and Amur-Khingan
metallogenic provinces are considered, as well as those of raremetal, rare earth, and uranium deposits in the Aldan-Stanovoi
province. The spatiotemporal, geological, and mineralogical attributes of large deposits are set forth, and their geodynamic
settings are determined. These attributes are exemplified in the large Tigriny Sn-W greisen-type deposit. The variation of
regional tectonic settings and their spatial superposition are the main factor controlling formation of large deposits. Such
a variation gives rise to multiple reactivation of the ore-magmatic system and long-term, multistage formation of deposits.
Pulsatory mineralogical zoning with telescoped mineral assemblages related to different stages results in the formation of
complex ores. The highest-grade zones of mass discharge of hydrothermal solutions are formed at the deposits. The promising
greisen-type mineralization with complex Sn-W-Mo ore is suggested to be an additional source of tungsten and molybdenum. The
Tigriny, Pravourminsky, and Arsen’evsky deposits, as well as deposits of the Komsomol’sk and Khingan-Olonoi ore districts
are examples. Large and superlarge U, Ta, Nb, Be, and REE deposits are localized in the southeastern Aldan-Stanovoi Shield.
The Ulkan and Arbarastakh ore districts attract special attention. The confirmed prospects of new large deposits with Sn,
W, Mo, Ta, Nb, Be, REE, and U mineralization in the south of the Russian Far East assure expediency of further geological
exploration in this territory. |
