... monzonite and granodiorite) and the Zaza suite comprising transitional from calc-alkaline to alkaline granite and quartz syenite. At the next stage, in the interval of 285–278 Ma the shoshonitic Low Selenga suite made up of monzonite, syenite and alkali rich microgabbro was formed; this suite was followed...

... of parental granite magmas. The low ( 87 Sr/ 86 Sr) 0 values in the rocks of the Zaza and Lower-Selenga suites, with δ 18 O varying from + 7.5 to + 8.5 ‰ and from + 6.5 to + 7.7 ‰ , respectively, evidence that they contain much mantle matter. The average δ 18 O value is + 5.5 ‰ in the mantle rocks...

... metamorphism of the Riphean Katera Group and low-grade metamorphism of the Cambrian Biram’ya Formation. However, the available direct observations of the relationships between the deposits of these groups at the upper reaches of the Levaya Biram’ya River and in the central part of the Barguzin Ridge suggest...

.... The porphyry complexes of the Zhireken and Shakhtama deposits in the Late Paleozoic-Mesozoic magmatic areas of East Transbaikalia (simplified according to [ 15 ]). 1 – non-separated effusive bodies (J 2 -J 3 ); 2 – 9 – intrusive formations (complexes) of the Selenga-Stanovoy (I) and Argun (II) zones: Late...

... al., 2010a ). The geochemical features of rocks of the Early Kunalei complex are typical of A -granitoids: extremely low contents of Sr (Ba) and maximum contents of Rb, Zr, and Nb ( Table 1 , Fig. 3 ). The Lower Selenga syenites and monzonites have an order of magnitude higher contents of Sr...

... are characterized by minimum salinization, high calcification, and low leaching (hydrolysis) and oxidation indices as well as a positive Eu anomaly and high ΣCe/ΣY and low La/Sm values. Pleistocene Pliocene geochemical composition of loose deposits environmental changes lithology Tologoi key section...

.... The present Uda–Vitim island arc system ( Fig. 1 ) is an NE belt, 800 km long and 80–100 to 200 km wide, extending from the lower Selenga catchment to the middle reaches of the Vitim. In the south and southeast the zone is bounded by large faults (Tugnui–Konda, etc.) which separate the island arc system from...

... geomorphologic forms in the peripheral part of the Rita River fan on land is similar to the formation of an underwater topography in the region of the Selenga River delta. It occurs under the influence of seismogenic rupturing and following gravitational movements, which intensify in a water-saturated...

...Leonard D. Ancuta; Peter K. Zeitler; Bruce D. Idleman; Brennan T. Jordan Abstract A new comprehensive suite of 235 whole-rock 40 Ar/ 39 Ar ages ranges from Holocene to ca. 30 Ma for Cenozoic volcanic rocks in central Mongolia. Their total preserved volume is ∼1540 km 3 , but prior to erosion...

... of the activity of a low-energy mantle plume with the final stage of the Hercynian orogeny in space and time. At the early stage of magmatism, during the formation of the Barguzin granites, the plume had only a thermal influence on the crustal rocks heated as a result of Hercynian fold–thrust deformations...

... from the lower course of the Khilok River (a right tributary of the Selenga River) to the Svyatoi Nos Peninsula (Lake Baikal) and the right bank of the Barguzin River in its lower course ( Fig. 1 ). The band is about 350 km long and comprises ten found groups of composite dikes of type 2 (hereafter...

.... The ophiolites that mark zones of spreading formed concurrently with Hawaiian-type high-Ti low-Cr subalkalic basalts (OIB) indicative of within-plate oceanic magmatism driven by hotspot activity. Fig. 2. Flow chart of thrust complexes in Dzhida zone, Southwestern Transbaikalia and northern Mongolia...

... ) and have much higher REE abundances than the Marekta-Bereya granites, though they are similar in SiO 2 and alkalinity ( Fig. 5 ). More acid leucogranites of the northern part of the pluton ( Table 1 , analyses 15–19) show low REE and rather high Eu maxima, possibly, because of the presence of cumulate...

.... The Selenga–Vitim volcanic–plutonic belt (SVVPB) and the Gobi-Altai volcanic–plutonic belt (GAVPB) are marked lilac. The Khangai region is located in Western Mongolia in the center of the CAOB, bounded by the Siberian Craton in the north and by the Tarim and Sino-Korean cratons in the south ( Fig. 1...

...–syenite intrusive series with synplutonic basites (Lower Selenga Complex, 285–278 Ma); 3 , transitional high-K calc-alkaline to alkali granites and quartz syenites with synplutonic basites (Zaza Complex, 305–285 Ma); 4 , high-K calc-alkaline quartz monzonites, quartz syenites, and gabbroids (Chivyrkui...

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