Origin of the Oligocene manganese deposit at Obrochishte (Bulgaria): Insights from C, O, Fe, Sr, Nd, and Pb isotopes
Ore Geology Reviews(2020)
Abstract
•Mn-carbonate ore at the Obrochishte has dual origin: diagenetic and authigenic.•Mn deposition was a result of the climatic events at the Late Eocene-Early Oligocene.•Mn ore was deposited in a redox-stratified basin, similar to the modern Black Sea.
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Key words
Mn metallogenesis,C-O-Fe-Sr-Nd-Pb isotopes,Early Oligocene,Submarine groundwater discharge,Water column anoxia,Proto-Black Sea geochemistry
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