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ORE-BEARING STRUCTURE OF THE PECHENGA ORE DISTRICT (ARCTIC ZONE OF RUSSIA)
Abstract
The Pechenga ore region spatially combines platinum-metal plutogenic, copper?nickel volcano?plutogenic, uranium-ore and gold-ore fluid-metasomatic systems, which are formed under different geotectonic regimes in the Karelian and Svecofennian (2.4?1.6 billion years) stages of development of the Baltic shield, as well as lead-zinc mineralization of the Paleozoic age. At the same time, the role of mantle sources and processes in the formation of ore mineralization decreased, and intra-crustal mineralization increased. This explains the gradual transition of platinum-metal mineralization in connection with the ultrabasites to copper?Nickel sulfide in association with gabbro?wechrlite intrusions and further to metamorphic and hydrothermal?metasomatic uranium and gold mineralization. The gold-ore mineralization in the core of the borehole SG-3 is considered in detail, where it is found at a depth of 9500-11000 m, where it spatially coincides with the zones of regressive changes. The possibility of the presence of low-sulphide platinum-metal mineralization by analogy with the deposits of the Norilsk ore region is considered for the first time.
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