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Geoinformatika 2018; 2(66) : 66-74

УДК 550.834

FEATURES OF THE DEEP STRUCTURE OF ORE DISTRICTS OF THE UKRAINIAN AND FENNOSCANDIAN SHIELDS

G. Drogitskaya1, N. Sharov2

1Institute of Geophysics named after  S.I. Subbotin,  NAS of Ukraine, 32 Acad. Palladina av., Kiev, 03680 Ukraine:
2Institute of Geology, Karelian Research Center, Russian Academy of Sciences, 11 Pushkinskaya,str. , Petrozavodsk, Republic of Karelia, Russia, 185910,

Purpose. The aim of the study is to identify medium-scale inhomogeneities in the earth’s crust and the Moho section, and to establish the spatial relationship between surface structure and ore deposits within them.  The Ukrainian and Fennoscandian shields have been studied in detail by seismic methods. Seismic profiles crossing paleoproterozoic structures, metamorphic and magmatic complexes, passed in close proximity to large magmatic and hydrothermal deposits.
Design/methodology/approach. Due to this, in the Kirovograd, Pechenga, Onega ore regions, based on the correlation of geological and seismic data, it was possible to identify medium-scale inhomogeneities in the earth’s crust and the Moho section and establish the spatial relationship of surface structures and ore deposits within them. In the Kirovograd ore region, there is a deflection in the relief of the section of the Moho or mantle ditch over which hydrothermal metasomatic uranium deposits are located.
Findings. In the Pechenga ore region, a local rise in the Moho section or a relic mantle plume was found, with which magmatic copper-nickel deposits associated with mantle gabbro-verlite intrusions correlate on the surface. In the Onega ore region, it was established that the deposits are spatially related to the presence of an increased thickness of the underplating layer, where the main differentiation of mantle magmatic melts, with the separation of fluid and ore phases that occurred in the Paleoproterozoic. It created favorable conditions for the subsequent introduction of metal-enriched magmatic melts into the upper levels of the cortex.
Practical value /implications. This proves that in the ore regions located on ancient shields the local inhomogeneities of the crust and Moho section and the relationship of endogenous ore deposits with them cannot be described by any one model.

Keywords: deep seismic sounding (DSS) method, earthquake exchange waves method (MOVZ), Moho surface, bark, mantle

 

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