Precambrian geosynclinal metallogeny of Ukrainian shield |
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| Abstract: | The granites of the Ukrainian shield are secondary; the “shield,” in the first instance, is a segment of a fold belt which extends from the Black Sea, via the Voronezh Arch, to the Kola Peninsula. The metamorphic ungranitized anticlines are narrow folds in which are found iron, copper, zirconium and precious metals. Iron, titanium, copper, graphite and mica deposits are found in the folds of granitized gneisses, migmatites, anatektites and granites. The crystalline metal ores are associated with metamorphosed elastics and evaporites; the titanium, copper, cobalt, gold, vanadium, mercury, chromium and nickel deposits – associated with sedimentary volcanics and evaporites. The high-grade metamorphics Contained the deposits of titanium, iron, calcium, magnesium, copper, vanadiuta, lead and zinc. The chromites and nickel silicates are associated with the intrusives. In short, metamorphic history and mineralogy exercised a direct control over the size and grade of ore deposits. |
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