Stages of Tectono-Magmatic Activity in the Border Zone of the Siberian Platform and the Tannuola–Khamsara Segment of the CAFB (According to the Results of U–Pb Isotope Studies)

Autor: S. I. Shkolnik, L. Z. Reznitskii, E. F. Letnikova, A. I. Proshenkin, Alexander V. Ivanov
Rok vydání: 2021
Předmět:
Zdroj: Doklady Earth Sciences. 498:451-455
ISSN: 1531-8354
1028-334X
Popis: Based on the dating of metamorphic and igneous rocks of the northeastern part of the Khamsara terrane, the main stages of tectono-magmatic activity at the border of two large structures—the Central Asian fold belt (CAFB) and the Siberian craton—have been established. The formation of the initial volcanogenic–sedimentary formations of this terrane, which mark the continental-marginal stage of development, took place in the range of 680–640 Ma. The age of accretion–collisional events in the CAFB fragment adjacent to the Siberian platform is fixed by the intrusion of postcollisional granitoids with an age of 480 Ma. Subsequent manifestations of Ordovician intraplate volcanism (464–462 Ma) are associated with the decay of the collisional orogen under the conditions of incipient rifting. Another stage in the development of this block is also associated with the processes of intracontinental extension and is represented by Late Paleozoic basic volcanism with an age of 267 Ma. The first established manifestations of rifting processes of different age levels within the fragment of the CAFB considered are associated with its location on the border of large inland structures separated by faults that retain their activity for a long time.
Databáze: OpenAIRE
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