Инд. авторы:	Volkova N.I., Mikheev E.I., Travin A.V., Vladimirov A.G., Mekhonoshin A.S., Khlestov V.V.
Заглавие:	P-T CONDITIONS, U/Pb AND Ar-40/Ar-39 ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION
Библ. ссылка:	Volkova N.I., Mikheev E.I., Travin A.V., Vladimirov A.G., Mekhonoshin A.S., Khlestov V.V. P-T CONDITIONS, U/Pb AND Ar-40/Ar-39 ISOTOPIC AGES OF UHT GRANULITES FROM CAPE KALTYGEI, WESTERN BAIKAL REGION // GEODYNAMICS & TECTONOPHYSICS. - 2021. - Vol.12. - Iss. 2. - P.310-+. - ISSN 2078-502X.
Внешние системы:	DOI: 10.5800/GT-2021-12-2-0526; WoS: 000664991500008;
Реферат:	eng: The study is focused on metapelitic granulites of Cape Kaltygei (Western Baikal region) that contain a diagnostic mineral assemblage of ultrahigh temperature (UHT) metamorphic rocks (orthopyroxene+sillimanite+quartz). The pseudosection-based thermobarometry yields peak metamorphic temperature and pressure values (T=950 degrees C, P=similar to 9 kbar) and suggests near-isobaric cooling (IBC) conditions during the retrograde evolution of the granulites. The U/Pb zircon age estimates for metamorphism (similar to 1.87 Ga) support the data published by other researchers. The SHRIMP-II U-Pb dating of zircon cores yields a minimum protolith age of 1.94-1.91 Ga. Biotites and amphiboles from granulites of Cape Kaltygei show the Ar-40/Ar-39 isotopic ages that are close to the Early Paleozoic accretion-collision system of the Western Baikal region.
Ключевые слова:	SHRIMP; EVOLUTION; THERMOCHRONOLOGY; SIBERIAN CRATON; OLKHON REGION; U-Pb and Ar-Ar geochronology; P-T pseudosections; UHT granulites; Western Baikal region; Cape Kaltygei; ZONE;
Издано:	2021
Физ. характеристика:	с.310