Terrigenous Rocks of the Kodar Group in the Udokan Subzone of the Kodar–Udokan Trough, Aldan Shield: Age, Sources, and Provenance Areas.

The results of U–Th–Pb (LA-ICP-MS) geochronological studies of detrital zircon from metasandstones of the Kodar Group of the Udokan Complex of the Aldan Shield are presented. It has been established that the Kodar Group of the Udokan subzone of the Kodar–Udokan trough has an age of 2.08–2.05 Ga. The provenance areas of the Kodar Group deposits were the Archean (ca. 2.65, 2.83, and 3.23 Ga) igneous and metamorphic complexes of the Chara–Olekma Geoblock of the Aldan Shield and the adjacent territory of the Stanovoi suture zone, as well as Paleoproterozoic (ca. 2.08 Ga) island arcs or active continental margin complexes that existed in the southern margin of the Archean Chara–Olekma Geoblock and are unidentified on the present erosional level. It is assumed that rocks of different ages, belonging both to the Kodar Group of the Udokan Complex and to the metamorphic complexes of the Stanovoi suture zone, can be tectonically juxtaposed in the southern part of the Udokan subzone of the Kodar–Udokan trough. [ABSTRACT FROM AUTHOR]