TY JOUR TI The origin of black shale-hosted Mn deposits in Paratethyan basins: Constraints from geological events at the Eocene/Oligocene boundary KW Paratethyan basins KW Mn deposits KW Eocene/Oligocene boundary KW geological events. JO Russian Journal of Earth Sciences AU Varentsov, I.M. AU Muzyliov, N.G. AU Nikolaev, V.G. AU Stupin, S.I. PY 2003 IS 5 PB Geophysical Center of the Russian Academy of Sciences