This work presents the results of U–Th–Pb (LA–ICP–MS) geochronological study of detrital zircons from terrigenous deposits of the Olokit zone of the Baikal–Patom fold–thrust belt of the Siberian Craton. It was established that the age of deposits of the Olokit Formation is in the range of 0.86–0.72 Ga. Archean and Early Proterozoic rocks of the southern part of the Siberian Craton and the Neoproterozoic complexes of the Baikal–Muya belt were the sources of detrital zircons of the terrigenous rocks of the Olokit zone. There is no evidence of rocks that could have been the sources of Mesoproterozoic (1.08–1.46 Ga) and Late Paleoproterozoic (1.65 Ga) detrital zircons for the deposits of the Ondok paleo-uplift in the Olokit zone, in the Baikal mountain region, and in the Siberian Craton. The data obtained and the results of paleomagnetic reconstructions indicate that Siberia and Laurentia in the Meso- and Early Neoproterozoic were in a fixed position relative to each other; an unknown continental block composed of Mesoproterozoic rocks could have occupied the space between them.

中文翻译：

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Olokit 带（北贝加尔湖地区）碎屑锆石年龄及陆源矿床来源

这项工作展示了对西伯利亚克拉通贝加尔湖-帕托姆褶皱冲断带 Olokit 带陆源沉积物碎屑锆石的 U-Th-Pb (LA-ICP-MS) 年代学研究结果。确定Olokit组的沉积年龄在0.86~0.72 Ga。西伯利亚克拉通南部的太古代和早元古代岩石和贝加尔湖-木雅带的新元古代杂岩是碎屑的来源。 Olokit 带陆源岩石的锆石。没有证据表明岩石可能是贝加尔山地区 Olokit 带 Ondok 古隆起沉积物的中元古代 (1.08-1.46 Ga) 和晚古元古代 (1.65 Ga) 碎屑锆石的来源，以及在西伯利亚克拉通。获得的资料和古地磁重建结果表明，中、新元古代早期的西伯利亚和劳伦大陆相对处于固定位置；一个由中元古代岩石组成的未知大陆块可能占据了它们之间的空间。