The Upper Neoproterozoic glacial complex in central areas of the Siberian platform

摘要

A stratum of glacial diamictites with thickness of up to 160 m at the basement of the sedimentary cover, overlain by a series of cap carbonates up to 40 m thick is described for several boreholes in the central regions of the Siberian platform. The isotope composition of carbon in carbonates is identical to the Ediacaran cap carbonates from the Patom upland. The series of detrital zircons from diamictites (60 grains) contains three young grains aged 740-690 Ma, which restricts the time of formation of the glacial deposits to the late Neoproterozoic. Thus, the glaciations that were synchronous to the Stert and/or Marino glacial stages on the Siberian platform had a cap character.