... decrease of mantle helium in released gases. Thus, the Oka–Sayan helium anomaly extends ~340 km northwestward from the western flank of the Tunka rift basin along the line BEH ( Fig. 1 ) and follows faults in the Oka rift and the East Sayan fault zone. The helium isotope ratios decrease from 422 × 10...

... Khikushka from the high-mountain zone of the East Sayan and Lake Engarginskoe from the Tunka Rift valley. The purpose of those studies was to reconstruct the natural environment of the eastern part of the East Sayan and the Tunka Rift valley in the Late Glacial and Holocene, to correlate the reconstructed...

... ( 6 ), 546 – 565 (712–737). Arjannikova , A. , Larroque , C. , Ritz , J.-F. , Déverchère , J. , Stéphan , J.F. , Arjannikov , S. , San’kov , V. , 2004 . Geometry and kinematics of recent deformation in the Mondy-Tunka area (south-westernmost Baikal rift zone...

.... Similar signature of neotectonic inversion is found in inter-rift saddles on the eastern (from the side of Lake Baikal) and western (from the side of Lake Hövsgöl and Oka upland) borders of the Tunka rift valley ( Fig. 8 ). The floors of small basins (Mondy and Bystraya) are uplifted, eroded, and exist...

... — Busingol; III — Azass-Oka; IV — Sayan; V — Hangayn; VI — Tsaganul; VII — Arigiyngol. However, recent data place the eastern border of the terrane from the Main Sayan fault in the north, then along the W-E strike of the Tunka basin where it is buried under Cenozoic sediments, and then along Lake...

... tectonic settings in the zone of interaction between the structures of the Central Asian fold belt and Siberian continent margin. The southeastern part of East Sayan is conditionally divided into four structural and formational zones (SFZ): Gargan, Il’chir, Oka, and Khoito-Oka (Khamsara) ( Fig. 1...

... ± 573. The values of the quality factor and the attenuation coefficient are calculated for the whole southwestern flank of the Baikal rift system and for individual tectonic blocks: the stable Siberian Platform, Khamar-Daban and East Sayan uplifts, and South Baikal and Tunka basins. A comparison...

...–Mongolia microcontinent and the already amalgamated Tunka and Khamar-Daban terranes. However, the intrusion is discordant to the metamorphic zoning, which is the same for the Tunka, Khamar-Daban, and Dzhida terranes, and is unmetamorphosed. The Khamar-Daban granitoids, predominant among postmetamorphic...

... in eastern Tuva: At a depth of 50 km, a temperature reaches 1000–1200 °C, and the thickness of thermal lithosphere is reduced to 70–50 km. This testifies to a rift process west (probably, up to 96° E) of the Baikal Rift Zone. In western Tuva, the average heat flow is much lower, ~45–50 mW/m 2 , which...

...) typical of lavas in the inner Tuva-Mongolia microcontinent are encountered in the Tunka rift basin. The lavas of the Dzhida Caledonide zone on the southeastern border of the microcontinent, like the East Tuva lavas, have Δ8/4Pb below the DUPAL ratios (30–62). The DUPAL anomaly is associated with Cenozoic...

... , and Massault M. 2018 . Characterizing the present‐day activity of the Tunka and Sayan faults within their relay zone (western Baikal Rift System, Russia) , Tectonics 37 , 1376 – 1392 . Schlupp A. , and Cisternas A. 2007 . Source history of the 1905 great Mongolian earthquakes...

..., Irtysh, Northeastern, Teletskoe–Bashkaus, Shapshal fault zones, the Major Sayan Fault, as well as thrust faulting across Gorny Altai, West Sayan and Tunka bald mountains of the East Sayan. Displacements on strike-slip faults decrease in amplitude from a few thousands down to hundreds and tens...

... . Active faults of the northern Tien Shan: tectonophysical zoning of seismic risks . Russian Geology and Geophysics (Geologiya i Geofizika) 57 ( 6 ), 967 – 983 (1225–1250). Rychkova , K.M. , Ayunova , O.D. , 2019 . Helium isotope ratios in spring of the Tunka-Oka-Sayan rift zone (East...

.... , Michelot , J.-L. , Massault , M. , 2018 . Characterizing the present-day activity of the Tunka and Sayan faults within their relay zone (western Baikal rift system, Russia) . Tectonics 37 ( 5 ), 1376 – 1392 , doi: 10.1002/2017TC004691 . Salko , D.V. , Bornyakov , S.A. , 2014...

... partly overlaps the zone of variable lithospheric thickness which ranges from 200 km or more beneath the Siberian Craton to 120 and 170 km in Transbaikalia and Mongolia ( Kozhevnikov et al., 2014 ). The crust thickness was estimated to be 34–48 km beneath rift basins, 44–52 km under the East Sayan...

... and studied within the zone of the Peredovoi fault [ 1 , 2 , 8 , etc.] and was tentatively identified as a reverse-oblique fault with a right-lateral strike-slip component [ 9 ]. In the southeast the craton is bordered by the Obruchev ( Fig. 1 , 4 ) and Primorsky ( Fig. 1 , 5 ) rift faults. The former...

... of gold and some ore-forming elements (Zn, Cu, and Pb) in pyrrhotite ores testify to the removal of these elements with a metamorphogenic fluid. The removed ore-forming components might have been a source of material for later gold–sulfide–quartz deposits of the Urik–Kitoi zone in East Sayan. ✉...

... Baikal hotspot ( Yarmolyuk and Kovalenko, 1990 ), for example, may have caused one of the domal uplifting events; the highest altitude is >3000 m above sea level at the junction of the Khovsgol basin, the Tunka valley, and the Oka-Azas troughs ( Fig. 1A ). The Baikal rift system extends to the area...

... rifting and the related geological forcing of Late Cenozoic climate in Central Asia. We limit our consideration of mountain growth in Central Asia to the Altai, Sayan, and Hangayn systems which together make up a mountain province of 1.5·10 6 km 2 in total area. The territory of the Sayans (East...

... Barguzin zone ( Fig. 1 ). Belichenko et al. [ 3 ] extend the microcontinent southward, to Kyakhta, where high-grade metamorphic complexes are exposed, which were earlier erroneously considered ancient fragments of the basement. Khomentovsky [ 4 ] offered one more version. He believes that the Barguzin...