Инд. авторы:	Tretyakov A.A., Degtyarev K.E., Kotov A.B., Sal'nikova E.B., Shatagin K.N., Letnikova E.F., Yakovleva S.Z., Anisimova I.V.
Заглавие:	The age of the last episode of the Precambrian regional metamorphic event in south Ulutau (Central Kazakhstan): Results of U-Pb geochronological studies of granites from the Aktas complex
Библ. ссылка:	Tretyakov A.A., Degtyarev K.E., Kotov A.B., Sal'nikova E.B., Shatagin K.N., Letnikova E.F., Yakovleva S.Z., Anisimova I.V. The age of the last episode of the Precambrian regional metamorphic event in south Ulutau (Central Kazakhstan): Results of U-Pb geochronological studies of granites from the Aktas complex // Doklady Earth Sciences. - 2012. - Vol.446. - Iss. 1. - P.1037-1041. - ISSN 1028-334X. - EISSN 1531-8354.
Внешние системы:	DOI: 10.1134/S1028334X12090085; SCOPUS: 2-s2.0-84867481095;
Реферат:	eng: The basement of the south Ulutau sialitic massif, which is located in the western part of Central Kazakhstan, comprises metamorphized volcanogenic- sedimentary and plutonic complexes of Proterozoic age. The upper boundary of the metamorphism age corresponds to the age of nonmetamorphized syenites from the Karsakpai massif (673 ± 2 Ma, Late Riphean). U-Pb geochronological studies of accessory zircon were made, and a Late Riphean age of biotite alkali granite from the Aktas massif (the youngst metamorphic Precambrian igneous units in South Ulutau) was found. The obtained age estimate of 791 ± 7 Ma can be considered as the lower age limit of metamorphism. Thus, the last stage of regional metamorphism in South Ulutau took place in the second half of the Late Riphean, in the time interval of 790-670 Ma. © 2012 Pleiades Publishing, Ltd.
Ключевые слова:	uranium-lead dating; syenite; Riphean; regional metamorphism; granite; geochronology; age determination; Geochronology; Mica; Kazakhstan; Granite; Upper boundary; Time interval; Riphean; Proterozoic; Precambrian; Metamorphic events; Last stage; Kazakhstan; Lead;
Издано:	2012
Физ. характеристика:	с.1037-1041