The paper considers the results of geochronological (U-Pb method, ID-TIMS), geochemical, and Sm-Nd isotopic studies of granitoids, volcanics, and terrigenous rocks of the eastern Dzabkhan terrane, as well as felsic volcanics of the Dzabkhan Formation in its southern part. It is established that the post-kinematic granitoids of the Dzabhan–Mandal Zone, Erdenekhairkhan, and Bogdoingol blocks were formed in the range of 813 ± 9–772 ± 3 and ca. 720 Ma, and the rhyolites of the Dzabkhan Formation were formed at 790 ± 3 Ma. The rock sources in the southern part of the terrane and in the Bogdoingol Block were mainly ancient crustal complexes. Nd isotopic data on the rocks of the Dzabkhan–Mandal Zone and the Erdenekhairkhan Block demonstrate the mixed nature of their sources and suggest a significant contribution of Early Neoproterozoic juvenile material. Based on obtained and previous data, it is shown that the Dzabkhan terrane is not a homogeneous block of the Early Precambrian continental crust, but represents a Neoproterozoic composite terrane consisting of rocks of island arc and continental margin complexes, and reworked Early Precambrian continental crust. The correlation of the Precambrian complexes of the Dzabkhan terrane with those of the Songino, Baidarik, and Tarbagatai terranes is discussed, and features of the formation of the Neoproterozoic continental crust in the central segment of the Central Asian fold belt are considered. It is established that the Khangay group terranes comprise widespread oceanic, island arc, continental margin, and riftogenic complexes formed at ca. 960–930, 880–850, and 810–790 Ma. Based on the data obtained, a model of the formation and evolution of the Neoproterozoic crust of the Central Asian fold belt is proposed by the example of paleoreconstructions for 925 and 825 Ma. It is assumed that the extensive growth of the Neoproterozoic continental crust of the region was related to the subduction processes in the framing of the Rodinia supercontinent at about 960–860 Ma ago and continental rifting that initiated the breakup of the supercontinent in the middle Tonian at about 860 and 800 Ma ago.

本文考虑了东部Dzabkhan地层的花岗岩，火山岩和陆源岩以及Dzabkhan组的长英质火山岩的地质年代学（U-Pb方法，ID-TIMS），地球化学和Sm-Nd同位素研究的结果。它的南部。已经确定，Dzabhan-Mandal区，Erdenekhairkhan和Bogdoingol块的运动学后花岗岩体形成范围为813±9-772±3，范围约为。720 Ma，Dzabkhan组的流纹岩形成于790±3 Ma。地球南部和Bogdoingol街区的岩石源主要是古老的地壳复合体。Dzabkhan–Mandal地带和Erdenekhairkhan地块的岩石上的Nd同位素数据证明了其来源的混合性质，并表明了新元古代早期幼虫的重要贡献。根据获得的数据和先前的数据，表明Dzabkhan地层不是早寒武纪大陆壳的均质块体，而是代表新元古代复合地层，包括岛弧和大陆边缘复合体的岩石以及返工的早前寒武纪大陆地壳。讨论了Dzabkhan地层的前寒武纪复合体与Songino，Baidarik和Tarbagatai地层的前寒武纪复合体的相关性，并考虑了中亚褶皱带中段的新元古代大陆地壳的形成特征。可以确定，Khangay组的地层包括广泛的海洋，岛弧，大陆边缘以及在约旦河谷形成的裂谷复合体。960-930、880-850和810-790 Ma。根据获得的数据，以925Ma和825Ma的古构造为例，提出了中亚褶皱带新元古代地壳形成和演化的模型。假定该地区的新元古代大陆壳的广泛增长与大约960-860 Ma以前的Rodinia超大陆架的俯冲过程和大陆裂谷导致了Ton中部超大陆的破裂有关。大约在860和800 Ma之前。