Detrital Zircon Geochronology of the Volyn-Orsha Sedimentary Basin in Western Ukraine: Implications for the Meso-Neoproterozoic History of Baltica and Possible Link to Amazonia and the Grenvillian—Sveconorwegian—Sunsas Orogenic Belts

We used LA-ICP-MS U-Pb data for detrital zircon to constrain the Maximum Depositional Age (MDA) and provenance of clastic sedimentary rocks Volyn-Orsha basin, which filled an elongated (~625 × 250 km) depression in SW Baltica attained ~900 m thickness. Eighty-six zircons out one hundred three yielded concordant dates, with most them (86%) falling time interval between 1655 ± 3 1044 16 Ma clustering two peaks at ca. 1630 1230 Ma. The remaining dates older than 1800 MDA is defined by a tight group weighted mean age 1079 8 This corresponds ~90° clockwise rotation formation Grenvillian—Sveconorwegian—Sunsas orogenic belts. Subsidence was facilitated presence eclogites derived from subducted oceanic crust. sediments Orsha sub-basin northeastern part basin were local crystalline basement, whereas Volyn sub-basin, extending margin Baltica, transported orogen Laurentia, Amazonia.