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Home » Archive of journals » Issue 3(35) 2019 » Depth structure and ore-forming systems of the Pechenga ore region (Russian Arctic Zone)


JOURNAL: 2019, №3(35), p. 107-122

HEADING: Study and development of nature resources of the Arctic

AUTHORS: Lobanov K.V., Chicherov M.V., Sharov N.V., Chizhova I.A., Gornostaeva T.A.

ORGANIZATIONS: Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of RAS, Institute of Geology of the Karelian Research Centre of the Russian Academy of Sciences

DOI: 10.25283/2223-4594-2019-3-107-122

UDC: 553.4

The article was received on: 26.02.2019

Keywords: Arctic zone, M-discontinuity border, Pechenga ore region, copper-nickel deposits, gold mineralization, platinum group metals, Kola super-deep wel, seismic studies

Bibliographic description: Lobanov K.V., Chicherov M.V., Sharov N.V., Chizhova I.A., Gornostaeva T.A. Depth structure and ore-forming systems of the Pechenga ore region (Russian Arctic Zone). Arctic: ecology and economy, 2019, no. 3(35), pp. 107-122. DOI: 10.25283/2223-4594-2019-3-107-122. (In Russian).


The integral depth model of the Pechenga ore region was created via computer simulation on the basis of the results of geophysical studies and ultra-deep drilling. The integral depth model simulates the Pechenga ore region as a horizontal section of a mantle volcano-plutonic ore-forming system of the central type. The model defines the North wing of the Pechenga structure as a volcanic caldera fragment, and its southern part describes as a scaly monocline, combined with the domes of rheomorphicgranitoids. Subsequently, they underwent intense compression and metamorphism. Then, in conditions of stretching, steeply dipping zones of cataclasites and retrograde metamorphism were formed. Thus, the Pechenga Cu-Ni deposit can be referred to the volcano-plutonic type and the corresponding ore-forming system of the mantle-crust type.

Using geophysical methods, the Vp/Vs anomaly at a depth of 20-25 km and the rise of the Moho boundary, reaching a maximum height of 34 km under the Pechenga structure, were identified. This can be interpreted as a relic mantle plume that determined geological events in the Paleoproterozoic.

The compilation of structural, petrological, mineralogical and geochemical data suggests that at the upper levels of the Cu-Ni ore-forming system was evolving in two stages: 1) the introduction mantle gabbro-wehrlite sills in heterogeneous Productive strata, their differentiation and the formation of magmatic Cu-Ni ores; 2) shear deformations and metamorphism of gabbro-wehrlite sills and the deposition of remobilized Cu-Ni ores in the synmetamorphic shear zones.

Drilling and studies of the SG-3 well have proven high saturation of the Precambrian crust with a variety of ore mineralization cross the whole section, including gold ore one in the range of 9800-11000 meters. The gold mineralization spatially coincides with the zones of regressive changes, which indicates its structural control. The question of the gold mineralization position in the SG-3section in the overall sequence of endogenous processes remains debatable.

Based on the integral geodynamic model of the deep structure of the Pechenga ore region, a new interpretation of the deposits’ localization is proposed. According to these views, the Pechenga ore field with nickel-bearing intrusions is a paleo-analogue of the Norilsk ore region, but has undergone intensive tectonic-metamorphic transformations. Given that the horizons of low-sulfide PGE mineralization in gabbro-wehrlite stratified intrusions were identified in the Norilsk area, an attempt was made to study the same mineralization in the Pechenga ore region.

Finance info: Работа выполнена при финансовой поддержке проекта РФФИ № 18-05-70001 и программы Президиума РАН № 55 «Арктика — научные основы новых технологий освоения, сохранения и развития».


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DOI 10.25283/2223-4594