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Home » Archive of journals » No. 3(39) 2020 » Geophysical model of the Earth’s crust, geodynamic conditions and prospects for the discovery of Pb-Zn deposits in the Russian Arctic

GEOPHYSICAL MODEL OF THE EARTH’S CRUST, GEODYNAMIC CONDITIONS AND PROSPECTS FOR THE DISCOVERY OF PB-ZN DEPOSITS IN THE RUSSIAN ARCTIC

JOURNAL: No. 3(39) 2020, p. 87-98

HEADING: Study and development of nature resources of the Arctic

AUTHORS: Galyamov, A.L., Volkov, A.V., Lobanov, K.V.

ORGANIZATIONS: Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry of RAS

DOI: 10.25283/2223-4594-2020-3-87-98

UDC: 553.44:553.061

The article was received on: 24.06.2020

Keywords: deposit, Russian Arctic zone, Mississippi Valley Type — MVT, Sedimentary Exhalative — SEDEX, forecast, Earh crust, deep structure, tectonic environment, Volcanic Massive Sulphide — VMS), lead, zinc, geophysical model

Bibliographic description: Galyamov, A.L., Volkov, A.V., Lobanov, K.V. Geophysical model of the Earth’s crust, geodynamic conditions and prospects for the discovery of Pb-Zn deposits in the Russian Arctic. Arctic: ecology and economy, 2020, no. 3(39), pp. 87-98. DOI: 10.25283/2223-4594-2020-3-87-98. (In Russian).

Abstract:

The article discusses the results of a comparative metallogenic GIS analysis based on GOCE (Gravity Field and Steady-State Ocean Circulation Explorer) data that allows the use of elements of the deep crust structure as global features in forecast and prospecting models of Pb-Zn deposits. Through the GIS analysis the authors have identified the main global features: the spatial distribution of MVT-type deposits coincides with the asthenospheric uplifts of the MOHO discontinuity; deposits are confined to the medium-temperature region of the upper mantle and are controlled by deep deflections of the crust sedimentary layer, identified by seismic velocities; the VMS-type deposits, located mainly on a thin sedimentary crust, correlate with moderate thickness of the lower crust; the SEDEX-type deposits, which occupy an intermediate position between MVT and VMS, are controlled by thin and/or moderately thick sedimentary crust in the areas of rift development. The use of these global features in forecast and prospecting models is to identify new promising areas in the Russian Arctic zone for predicting new Pb-Zn deposits.
Keywords: Arctic zone of Russia, crust, deep structure, tectonic environment, deposit, MVT, SEDEX, VMS, lead, zinc, model, forecast, prospecting.

Finance info: This work was financially supported by the Russian Federal Property Fund (Grant No. 18-05-70001 “Studying the geological and geodynamic conditions of the formation of large strategic metal deposits in the Arctic zone of Russia: conclusions for forecasting and prospecting for new deposits”).

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DOI 10.25283/2223-4594