Abstract
Abstract Carbon and oxygen isotopic composition of the manganese carbonate ores and rocks was studied by the author in the Early Oligocene deposits and ore occurrences in the Ukraine, Georgia, and Kazakhstan. The δ 13C and δ 18O values were registered in the Nikopol (respectively, –24.6…–4.9‰ and 26.4…31.8‰), Mangyshlak (–32.9… –1.4‰ and 15.8…30.9‰), and Chiatura (–34.5…–8.3‰ and 18.9…30.5‰) deposits. Their distribution offers to distinguish two genetic types: the first one was formed at the early diagenetic stage and the second one – was typical of sediments at the late diagenetic (catagenetic) stage. Formation of manganese carbonates at the late diagenetic (catagenetic) stage (the Chiatura deposit) was generally a multistage process resulting from discharge of catagenetic waters of different nature.
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