НОВЫЕ ДАННЫЕ О МИНЕРАЛОГИИ, ГЕОХИМИИ И ГЕНЕТИЧЕСКИХ ОСОБЕННОСТЯХ БЕЛОГОРСКОГО МАГНЕТИТОВОГО МЕСТОРОЖДЕНИЯ (СИХОТЭ-АЛИНЬ)

Abstract

New data are in favor of the view previously substantiated by geological, geochemical and isotopic data that orebodies of the Belogorskoe deposit are metamorphosed and partially regenerated in the Late Cretaceous-Paleogene products of erosion (in the Triassic) of laterite weathering crust of gabbroids. The source for the formation of the Belogorskoe deposit was shown to be products of exogenous destruction of rocks, which by their isotopic and geochemical characteristics are close to the Cambrian gabbroids of the Vladimiro-Alexandrovsky massif (the southern part of the Okrainsko-Sergeevsky terrane). It has been found that the Belogorskoe deposit is composed of rocks and ores, the primary (magmatic) distribution of REE in which was changed to varying degrees as a result of interaction between sediments (protoliths) and seawater (presumably during the Late Jurassic-Early Cretaceous accretion), as well as their metamorphosed analogues and hydrothermal solutions (in the Late Cretaceous-Paleogene). The influence of gabbroids (as a source of matter) on the chemical and mineral composition of the Belogorskoe deposit is consistent with the data reported in the article concerning the enrichment of orebodies in such elements as Fe and Mn that are characteristic of ultrabasic rocks and the presence of Au-Ag-Pd-Pt, Ni-Co and Bi mineralization in them. The orebodies of the Belogorskoe deposit contain accessory minerals and mineral varieties that are rarity in nature and little-studied. These include an unusually rich Th variety of zircon, baddeleyite, gudmundite, a large group of bismuth compounds, including Bi2Te, (Ag,Pb)BiS2, as well as coloradoite, lafossaite, sanbornite, perovskite, and the compound InPO4. There is also a large group of rare and unusual compounds of noble metals: copper gold, platinum gold, jonassonite, disordered solid solutions of Cu, Ag and Au (Au-based), Pt-Pd, Pt-Ag intermetallics, and other rare minerals and mineral varieties.