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Rytsk E. Yu. Tolmacheva E. V. Velikoslavinsky S. D. Kuznetsov A. B. Rodionov N. V. Andreev A. A. Fedoseenko A. M. 《Doklady Earth Sciences》2021,496(2):146-150
Doklady Earth Sciences - The results of U–Pb geochronological (SIMS) study of zircons from granitoids of the Konstantinovskii Stock located 6 km from the Sukhoi Log gold deposit are reported.... 相似文献
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Chugaev A. V. Chernyshev I. V. Rytsk E. Y. Salnikova E. B. Nosova A. A. Travin A. V. Kotov A. B. Fedoseenko A. M. Anisimova I. V. 《Doklady Earth Sciences》2019,489(1):1363-1367
Doklady Earth Sciences - High-precision dating of granitoids is of key significance for age identification of the main stages of crust formation in various blocks of the continental crust. Here we... 相似文献
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E. Yu. Rytsk V. P. Kovach V. V. Yarmolyuk V. I. Kovalenko E. S. Bogomolov A. B. Kotov 《Geotectonics》2011,45(5):349-377
New data on the geology and tectonics of the main structural elements of the East Transbaikalian segment of the Central Asian
Foldbelt are discussed. Correlation charts of the main stratified and igneous complexes are compiled. The rocks of the Baikal-Patom
and Baikal-Muya belts, as well as the Barguzin-Vitim Superterrane, are characterized by new Nd isotopic data, which have allowed
us to establish the sources of these rocks, to separate isotopic provinces, and to distinguish two stages of crust-forming
processes: the Early Baikalian (1.0–0.8 Ga) and the Late Baikalian (0.70–0.62 Ga). The Early Baikalian crust was formed in
relatively narrow and spatially isolated troughs of the Baikal-Muya Belt and probably in the Amalat Terrane, whereas the Late
Baikalian continental crust was formed and reworked in the Karalon-Mamakan, Yana, and Katera-Uakit zones of the Baikal-Muya
Belt. The Baikal-Patom Belt and most of the Anamakit-Muya Zone in the Baikal-Muya Belt are characterized by remobilization
of the Early Precambrian continental crust and by a subordinate role of Late Riphean juvenile sources. Reworking of the mixed
Late Riphean and Early Precambrian crustal sources is typical of the Barguzin-Vitim Superterrane. The origination and evolution
of the continental crust in the studied region are considered in light of new data; alternative versions of paleogedynamic
reconstructions are discussed. 相似文献
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The time length of formation of the Angara-Vitim batholite: Results of U-Pb geochronological studies
V. P. Kovach E. B. Sal’nikova E. Yu. Rytsk V. V. Yarmolyuk A. B. Kotov I. V. Anisimova S. Z. Yakovleva A. M. Fedoseenko Yu. V. Plotkina 《Doklady Earth Sciences》2012,444(1):553-558
This paper describes the results of geochronological studies (U-Pb method over micro lots and single grains of zircon) of autochtonous and allochtonous granitoids of the Barguzinskii complex of the Angara-Vitim batolite of the petrotypical area in the basin of the Dzhirga and Kovyli rivers (tributaries of the Barguzin River). The age of crystallization of gneissose granitoids is 297 ± 5 Ma, and that of intrusive leucocratic biotite granites is 291 ± 1 Ma. The estimates of the age finalize the discussion on the age of granitoids of the Barguzin complex and cannot be considered as ??rejuvenated.?? The analyses of the geochronological data that have been obtained up to the present for granitoids of the Angara-Vitim batolite with the SHRIMP and U-Pb methods for large samples of zircons show that in the majority of cases they cannot be used for precise estimation of the age of their crystallization. The geochronological data obtained with use of the U-Pb method over micro samples and single grains of zircon allow one to make a conclusion on the formation of granitoids of the described complexes of the Angara-Vitim batholite that occurred within 303 ± 7?C281 ± 1 Ma. Thus, the time length of formation of the largest in the eastern segment of the Central Asian belt of the Angara-Vitim batholite is not more than 22 Ma (minimum 6 Ma), which allows us to consider it as a large granitic province and is a boundary condition for development of the geodynamic models of its formation. 相似文献