... zone of Transbaikalia showed their palingenic origin and independent evolution. The two plutons belong to two different magmatic complexes: the Early Paleozoic Krestovsky quartz-diorite-granodiorite-granite complex and the Late Paleozoic Olekma granite-leucogranite complex. New Rb-Sr age determinations...

... zone (WS) are presented, which confirm the existence of Carboniferous (360–290 Ma) magmatic stage not only in the west but also in the center of the WS and refine the age of Early Paleozoic batholiths of the Olekma complex (480–430 Ma). This indicates that they are coeval with batholiths of the Malkhan...

...Fig. 1. Schematic geologotectonic map of the study area (after [ 6 ], simplified). 1 — post-Carboniferous intrusions and Meso-Cenozoic deposits; 2 — granitoids of the Olekma complex (PZ 1 ); 3 — granitoids of the Krestovsky complex (PZ 1 ); 4 — gabbroids and ultrabasites of the Kruchina...

...A. I. Tougarinov Abstract Crystalline Precambrian rocks exposed in the basins of the Olekma and Aldan Rivers represent the southeastern part of the Siberian Platform. To the north and east the basement is covered by Paleozoic and Upper Proterozoic formations. To the south and west lie younger...

...-facies zones were identified: Kas (Lemok-1, Averinskaya-150, Tyiskaya-1, Vostok-4, and Eloguiskaya-1 wells), where sedimentary complexes accumulated in a salt subbasin, and Ket’ (Vostok-1 and Vostok-3 wells) with the deposition in an open sea basin. The boundary between these structure-facies zones...

..., Vostok-1, Vostok-3, Vostok-4, and others). Two structure-facies zones are recognized in the study area: Kas zone (Lemok-1, Averinskaya-150, Tyiskaya-1, Vostok-4, and Eloguiskaya-1 wells), in which the sedimentary complexes accumulated in a salt subbasin, and Ket’ zone (Vostok-1 and Vostok-3 wells...

...N.V. Mel’nikov; Yu.Ya. Shabanov; O.S. Shabanova Abstract The former stratigraphic chart of the Cambrian in the Turukhansk–Irkutsk–Olekma region of the Siberian Platform was compiled in 1986 and approved in 1988. Large amounts of data were obtained from new wells drilled in the western and northern...

... and migmatites of the Olekma complex; 5 , granulite (Kurulta) complex ( a , paragneisses; b , orthogneisses); 6 , metagabbro–diorite–tonalite–trondhjemite complex (Amn, Amnunnakta block; Tu, Tungurchakan block); 7 , tonalites and trondhjemites (UO, Ust’-Oldongso block); 8 , granites and bastard granites...

..., the upper reaches of the Vitim, Olekma, the Lena drainage basins (Yakutsk Sea), and the Transbaikalian paleolake of the glaciation maximum but leaves aside numerous small damlakes on the periphery of ice sheets. Large Pleistocene proglacial lakes did not exist in the southwestern part of eastern...

... mafic and ultramafic dykes. The infracrustal complex of trondhjemitic and granitic composition is dominated by enderbites, charnockitic gneiss and granitic gneisses that make up about 50% outcrop of the Aldan GGnT. The Olekma GGT comprises several major structural-lithological units...

... ). The rocks of the Cambrian complex dips monoclinally toward the Loglor swell and Linde depression , within which the base of the Cambrian is inferred to lie at depths of up to 10 km, resting conformably on the Vendian complex. The oldest rocks penetrated by the Srednekononchanskaya 1 well represent...

... the Chara-Olekma block west of the Aldan Shield ( Fig. 1 ). These depressions are filled with Lower Proterozoic deposits of the Udokan complex. In the largest Kodar-Udokan trough, they are up to 10 km in thickness. The tectonic nature of these structures and origins of their fills are interpreted...

... of strong shoaling and high salinity of the basin, as it occurred throughout the Turukhan-Irkut-Olekma region, or, on the contrary, because of too great water depths (southern side of the Aldan complex, Dzhanda River) [ 26 ]. The subsequent transgression, which acted upon the Siberian Platform since...

... in mW/m 2 ; 4 , transects, abbreviated as: DD for Dong Ujimqin–Donggou, MS for Manzhouli–Suifenhe, SS for Svobodnyi–Syurkum cape, TA for Tynda–Amurzet, ON for Olekma River–Nevelskoi Cape, and DU for Dzhalinda–Ulu. Heat flow data are after ( Duchkov, 1985 ; Global Geoscience Transect, 1992 ; Gornov...