Age and Sources of Sedimentary Rocks of the Daur Series (Riphean)in the Argun Continental Massif: Results of U–Th–Pb and Lu–Hf Isotope Studies of the Detrital Zircon
The first results of U–Th–Pb and Lu–Hf isotopic studies of the detrital zircons of sedimentary rocks of the Daur Series in the Argun continental massif of Central Asian fold belt are presented. It is established that the youngest detrital zircons from sandstones of the Urulungui and Dyrbylkey formations of the Daur Series are of 899 and 771 Ma, respectively. This data set the maximum depositional age of the Daur Series and agreement with current views of the Late Riphean age of the Series. The majority of Late Riphean detrital zircons of sedimentary rocks of the Daur Series is characterized by Early Precambrian Lu–Hf model ages. In addition, in the studied rocks the Archean and Early Proterozoic detrital zircons are present. This suggests that either ancient (Early Precambrian) recycled material in the sedimentary rocks of the Daur Series is present, or the studied part of the Argun Massif is “exotic block”, the problem of the origin of which requires additional research.