...D.A. Bushnev; S.A. Ondar; N.S. Burdel’naya Abstract —The composition of the organic matter (OM) of coals of the Ulug-Khem Basin has been studied. According to Rock-Eval pyrolysis data, this OM is a type III kerogen, sometimes significantly oxidized. The coal of low-grade metamorphism has a high...

... (e.g.,  Vladimirskaya, 1960 ), Central Tyva ( Fig. 1 ) is considered in this study to encompass zones of Paleozoic rocks exposed along right and left tributaries of the Upper Yenisei (Ulug-Khem) River. In the regional Ordovician stratigraphy, this part of the Tyva basin makes up a separate facies zone...

...) the Tannu-Ola–Khamsara island arc zone with the Tannu-Ola (ToO), Ondum (On), and Khamsara (Khs) subzones, and (3) the East Tuva back-arc zone with the Agardag (Ag), Kaa-Khem (KKh), Kharal (Khr), and Ulug-O (UO) subzones and the Sangilen and Oka–Shishkhid segments of the Tuva–Mongolian massif ( Mongush et al...

... discharge valleys; 5 – alluvial plains, 6 – large erosion valley; 7 – Late Pleistocene volcanoes Sorug-Chushku-Uzyu (1), Ulug-Arga (2), Priozerny (3); 8 – boundary of area shown in Fig. 2 . The watersheds around the Todzha Basin are the highest uplifted neotectonic blocks, which is common...

... (Tuvan toponym: Ulug-Khem) and is related to the Yenisei River segment located in the Tuva basin between the confluence of the Bolshoy (Big) Yenisei (Biy-Khem) and the Maly (Small) Yenisei (Ka-Khem) and receives the Khemchik River, upon passing which, the Yenisei, already under its usual name, turns...

... the Academician Obruchev Ridge ( Fig. 1 ). It towers over the surrounding Tuva and Todzha intermontane basins. In the region considered, the axial part of the mountain range strings out along the Kaa-Khem fault zone and consists of a number of narrow ridges with altitudes of up to 2500–2890 m, separated...

... buried in the former and sediments became finer in the latter ( Arzhannikov et al., 2000 ). Repeated flooding of the Bii-Khem valley and formation of the latest Pleistocene–Holocene damlake in the western Todzha basin may have had either tectonic or climate causes. The climate controls of the river...

... which retarded magmatic discharge of deep interior parts of the Earth and favored fluid saturation of intermediate magma chambers and separation of a gas-fluid component in them. When moving from the Kaa-Khem rifting zone in southwestern and northeastern directions, pyrite-polymetal and gold...

... and Predivinsk zones) and in the Baikal-Vitim zone. Thus, the Riphean craton margin is characterized by the following specific features: — formation of a belt of large pericratonal depressions, i.e., marginal sedimentary basins with elements of synchronous rifting and high endogenic activity (Yenisei...

... and Tuva troughs; Ulug-Khem, Tuva, and Kyzyl depressions, and in the south – the Ubsunur, Kurai, and Chuya depressions filled with sedimentary-volcanogenic formations of the Lower–Middle Devonian, Molasses of the Middle–Upper Devonian and carboniferous deposits of the Carbon – Jurassic ( Fig. 1 ). Within...

... the geothermal model for continental rifts implying that magmatic activity in the western end of BRS has been controlled by lithospheric deformation. The geothermal model for the Baikal–Mongolia region covers the area northwest of the system of three rift basins along the East Sayan faults. 3 He/ 4 He ratio...

...–Vendian and Cambrian metamorphosed carbonate-terrigenous and volcanic rocks of Central Sangilen; 4 , Vendian–Early Cambrian tectonic fragments (I, Agardag zone, II, Kaa-Khem zone) of back-arc basins, composed of pillow lavas, siliceous and turbidite deposits with serpentinite melange, and cutting gabbro...

.... , 1993 . Sedimentation and Terrace Formation in the Valleys of Rivers of Southern Siberia [in Russian] . KGPI , Krasnoyarsk . Yamskikh , A.F. , 2001 . Ripple landforms in the Ka-Khem and Ulug-Khem river valleys and dammed basin formation...

... for heat flow determination are better in the Tuva basin where the groundwater effects are not so strong and the terrain is quite plain. The site occurs in the central Tuva basin southeast of Kyzyl city. Temperatures were measured in five boreholes in the Ulug-Khem coal deposit. Good logs suitable for heat...

...-Samagaltai and Ulug-Shangan uplifts in the south. Carbonatite zones within the study area include the structures of not only the Tuva rift depression but also the Khemchik–Sistigkhem depression and the Kurtushiba ophiolite zone in the West Sayans. The complex Karasug and Ulaatai-Choz (Fe, Ba, Sr, F, U...

... Tuvinian lava upland, within the Todzha basin, high values of He m and R cor have been established in the samples from the Azas spring (12): He m = 9.9%, R cor = 121 × 10 –8 . Near the Serlig-Khem lava field of Miocene–Early Pleistocene age localized 200 km southwest of the ETLU, helium isotopes...