Инд. авторы:	Ryabinin A.B., Buslov M.M., Zhimulev F.I., Travin A.V.
Заглавие:	The Late Paleozoic fold-thrust structure of the Tunka bald mountains, East Sayan (southern framing of the Siberian Platform)
Библ. ссылка:	Ryabinin A.B., Buslov M.M., Zhimulev F.I., Travin A.V. The Late Paleozoic fold-thrust structure of the Tunka bald mountains, East Sayan (southern framing of the Siberian Platform) // Russian Geology and Geophysics. - 2011. - Vol.52. - Iss. 12. - P.1643-1661. - ISSN 1068-7971. - EISSN 1878-030X.
Внешние системы:	DOI: 10.1016/j.rgg.2011.11.007; SCOPUS: 2-s2.0-82955189922;
Реферат:	eng: According to the new geological, geochronological, and structural data, the Tunka bald mountains (East Sayan) have a nappe structure, which formed in the Late Carboniferous-Early Permian. The deformations have been dated by the 40Ar-39Ar method on the basis of syntectonic micas and amphiboles, whose structural and spatial positions have been determined in oriented thin sections. The geometrical analysis of macro- and microstructures has revealed three development stages of the structures, which followed one another in progressive deformation. The first (thrust-fault) stage (316-310 Ma) comprised a group of N-verging thrust sheets. In the second (fold deformation) stage (305-303 Ma), they were folded. The third (strike-slip fault) stage (286 Ma) comprised high-angle shears, along which V-shaped blocks were squeezed westward from the most compressed areas. All the structures developed under near-N-S-trending compression. The thrusting in the Tunka bald mountains was coeval with the major shear structures in the eastern Central Asian Fold Belt (Main Sayan Fault, Kurai, Northeastern, and Irtysh crumpled zones, etc.). Also, it was simultaneous with the formation of continental-margin calc-alkalic and shoshonite series (305-278 Ma) as well as that of the alkali and alkali-feldspar syenites and granites (281-278 Ma) of the Tarim mantle plume in the Angara-Vitim pluton, located near and east of the studied region. Thus, the simultaneous development of the Late Paleozoic structures, active-margin structures, and plume magmatism in southern Siberia might have resulted from the global geodynamic events caused by the interaction between the tectonic plates which formed the Central Asian Fold Belt. © 2011.
Ключевые слова:	Main Sayan Fault; Microstructural analysis; Siberian Platform; active margin; argon-argon dating; calc alkaline rock; Carboniferous; compression; continental margin; deformation mechanism; fold and thrust belt; fold belt; folding; Micas; Tunka; Siberian Platform; Russian Federation; Buryatia; trend analysis; thrust; structural geology; strike-slip fault; shoshonite; Permian; Paleozoic; nappe; microstructure; magmatism; geochronology; East Sayan; Late Paleozoic folding, thrusting, and shearing; Dynamic analysis;
Издано:	2011
Физ. характеристика:	с.1643-1661