Abstract
The changing contents and ratios of certain primary and secondary elements in the composition of volcanogenic pyrite deposit ores reveal two tendencies that have different scales of their manifestation in geological time and space. The first one is expressed in terms of the evolution of geochemical differences of deposit ores during relatively short periods of pyrite formation in some ore provinces. It is determined by the changing stages of tectonic development and corresponding alterations of magma composition within the provinces. The other tendency is global; it is expressed in terms of century-old changes of ore geochemical characteristics in the deposits that have developed in different pyrite formation epochs over the last 3.5 billion years, probably as a result of the differentiation of Earth material, a gradual temperature drop in the upper mantle, and the associated development of tectonic conditions and magma-formation mechanisms.
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