Kumystin granosyenites complex of the late Cryogenian in Bolshoi Karatau (South Kazakhstan), age substantiation

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Abstract


The results of U–Pb geochronological studies of quartz syenites of the Kumystin complex of the Bolshoi Karatau ridge in southern Kazakhstan are presented and their late Neoproterozoic (717 ± 4 Ma) age is substantiated. Kumystin syenites complex together with rhyolites and basalts of the Kainar Formation are the youngest formations taking part in the basement of Karatau-Dzhebagly precambrian massif and formed in the second half of Cryogenian. The data set about the ages of the youngest complexes taking part in the basement of precambrian massifs of the Western part of the Central Asian belt indicates that the ending of magmatic activity within various massifs occurred asynchronously during the Neoproterozoic.


About the authors

K. E. Degtyarev

Geological Institute RAS Research Organization of the Russian Academy of Sciences

Author for correspondence.
Email: degtkir@mail.ru

Russian Federation, 7, Pyzhevsky lane, Moscow, 119017

Corresponding Member of the RAS

A. A. Tretyakov

Geological Institute RAS Research Organization of the Russian Academy of Sciences

Email: degtkir@mail.ru

Russian Federation, 7, Pyzhevsky lane, Moscow, 119017

E. B. Salnikova

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: degtkir@mail.ru

Russian Federation, 2, Makarova embankment, St.Petersburg, 199034

A. B. Kotov

Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences

Email: degtkir@mail.ru

Russian Federation, 2, Makarova embankment, St.Petersburg, 199034

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