Ore bearing factors of breaking-block structures of the Ukrainian shield
DOI:
https://doi.org/10.24028/gzh.0203-3100.v41i4.2019.177388Keywords:
megablocks, interblock suture zones, fault-block tectonics, fault zones, geodynamic mode, ore-bearing factors, metallogenic features, tectonomagmatic activation, kinematic types of structures and deformationsAbstract
Most ore occurrences and mineral deposits are known to be located in tectonic fault zones. In this regard, the article analyzes the ore content of regional and local fault zones developed in the megastructures of the Ukrainian shield: Podolsky, Volynsky, Ingulsky, Dnieprovsky, Priazovsky megablocks and Belotserkovsky-Odessky, Inguletsko-Krivorozhsky, Orekhovo-Pavlogradsky interblock zones. Geological and structural-tectonic features of megablocks and interblock suture zones are characterized; the main stages of their formation are highlighted. Based on the analysis of the distribution patterns of various deposits and ore occurrences in the fault-block tectonics of the Ukrainian Shield, ore-bearing factors and metallogenic features of megablocks and interblock suture zones, which are determined by the geodynamic regime of these structures, are established; specific megablocks and suture zones have their own distinctive features, and the metallogeny of megablocks differs from the metallogeny of interblock suture zones. The metallogeny of the megastructures of the Ukrainian shield and the ore content of regional and local structures is due to a combination of a number of factors of various importance. The main ones are the processes of evolution of mantle fluids and the degree of oxidation of crustal products during geological time. Of great importance was the level of erosion cut of specific structures, which determined the physicochemical conditions for the concentration of specific ore elements.
The metallogeny of various fault zones is determined by the combination of a number of favorable factors for the accumulation of metals in geological time and space. The most important ore-concentrating factors are the composition and quantitative ratio of ortho- and para-rocks and the presence in them of above-clark contents of characteristic metals; fault evolution, in which the mobility of metals and their concentration at less deep levels are activated; confinement to faults of igneous rocks; degree of eroded blocks; physicochemical features of fault rocks and uneven distribution of tectonic pressures; conditions and nature of the deformation of structures; lateral structure of faults.
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