First Data on the Age of Zircon Grains from the Upper Mesozoic Leskovo Unit of the Unda–Daya Basin, Eastern Transbaikalia
摘要
Abstract
The results of the determination of the age of zircon grains from tuffites of the Leskovo Unit of the Unda–Daya Basin, Eastern Transbaikalia, are presented for the first time. The age of the youngest population of zircon grains is 145.8 ± 3.8 Ma, approximately corresponding to the Jurassic–Cretaceous boundary and indicating the Early Cretaceous age of most of the Leskovo Unit. Given that the similar taxonomic composition of ostracods from the middle part of the Leskovo Unit and the Valanginian–Lower Hauterivian Dabeigou Formation of northeastern China, our U–Pb age from the lower part of the Leskovo Unit allows confident correlations of these lithostratons.