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Prediction of Ore Occurrences in South-Eastern Ukraine

2020; Volume: 42; Issue: 3 Linguagem: Inglês

10.15407/mineraljournal.42.03.069

2519-447X

I.Yu. Nikolaev, E. M. Sheremet, S.G. Kryvdik, S.М. Strekozov, L.D. Sietaia,

Geochemistry and Geologic Mapping

We present aspects of predicting ore occurrences at the Azov megablock of the Ukrainian Shield and the zone below the Dnieper-Donetsk Depression basin based on coined (geological, petrological, geochemical, and geoelectrical) criteria.We show that the ore distribution is determined by a regular confinement to certain geotectonic structures with changes in the petrogeochemical characteristics of the ore zones.The Orikhiv-Pavlograd suture zone (OPHZ) is considered separately as the zone of subsidence of the Dnipro plate near Azov.A brief description of its geological development is given and metallogenic zones are characterized, each of which has its own petrological and geochemical features and prospects for ore formation.The analysis of the composition of accessory minerals as indicators of metallogenic specialization in different subduction parts of the Azov megablock show its change as it moved from the west from the sutural subduction zone of the OPHZ to the east to its rear part, -the East Azov.The analysis of the geoelectric model of the Azov megablock shows its relationship with the stages of metamorphism.Deep (up to 50 km) low anomalies characterizing long tectonic structures (suture zones) can serve as indicators for the search for endogenous minerals.Geoelectric anomalies are related to tectonic joints and geochemical anomalies identified by geological survey can be used to predict areas promising for the detection of ore.In genetic aspect, these patterns are to some extent explained from the standpoint of plate tectonics.The article also focuses on the South-Donbas Metallogenic Zone, located at the border of the Dnieper-Donetsk Basin and the Ukrainian Shield.The ore formations of the second stage of tectonic-magmatic activation associated with andesite magmatism are characterized.To test the rare-metal and rare-earth element geochemical anomalies of the East Azov region, based on complex criteria, areas promising for prospecting are recommended.