Abstract

The first results of U–Th–Pb and Lu–Hf isotope studies of detrital zircons from sedimentary rocks of the Daur Series (Argun continental massif of the Central Asian Fold Belt) are presented. It is established that the youngest detrital zircons from sandstones of the Urulungui and Dyrbylkei formations of the Daur Series have the ages of 899 and 771 Ma, respectively. These data determine the maximum depositional age of the Daur Series and agree with the current ideas about the Late Riphean age of this series. The majority of Late Riphean detrital zircons from sedimentary rocks of the Daur Series are characterized by Early Precambrian Lu–Hf model ages. In addition, the Archean and Early Proterozoic detrital zircons are present in the studied rocks. This suggests either the presence of ancient (Early Precambrian) recycled material in the sedimentary rocks of the Daur Series or the fact that the studied part of the Argun massif is an “exotic block,” whose origin requires additional research.

中文翻译：

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达gun尔系列沉积岩（里菲安）的年龄和起源，阿尔贡大陆地块：碎屑锆石的U–Th–Pb和Lu–Hf同位素研究的结果

摘要

介绍了Daur系列（中亚褶皱带阿贡大陆块）沉积岩碎屑锆石的U–Th–Pb和Lu–Hf同位素研究的初步结果。可以确定的是，达Series尔系列的乌鲁伦基和达比尔比组地层砂岩中最年轻的碎屑锆石分别具有899 Ma和771 Ma的年龄。这些数据确定了达ur尔系列的最大沉积年龄，并与有关该系列晚期里菲安时代的最新观点一致。来自达ur尔系列沉积岩的大多数里菲安晚期碎屑锆石的特征是早寒武世的Lu-Hf模型年龄。此外，在研究的岩石中还存在太古代和早元古代碎屑锆石。