U-Pb SHRIMP ages of detrital zircons from Bebedouro formation, northeast Brazil: constraints on sediment provenance and depositional age of neoproterozoic glacial rocks of the São Francisco craton - Babinski, Marly; Liu, Dunyi; Trindade, Ricardo Ivan Ferreira da; Brito Neves, Benjamim Bley de (International Geological Congress, 2004)