First results of dating detrital zircons from the late precambrian quartzite-schist sequences of Chu block (Southern Kazakhstan)

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Abstract


U-Pb geochronological studies of detrital zircons from quartzite-schist sequences of the Akbastau Formations of the Chu block (northwest of the Chu-Kendyktas terrane, Southern Kazakhstan) have been provided. The concordant ages of detrital zircons are predominantly within the intervals of 1672-2115 Ma with peaks at 1697, 1780, 1857 and 2066 Ma. Individual zircon grains display ages of 2291-2332 Ma with peaks at 2303 and 2322 Ma. Neoarchean ages 2608-2747 with peak at 2681 Ma characterize another significant zircon population. The lower limit of deposition for the Akbastau Formations of the Chu block, corresponding to the youngest statistically significant zircon population, is estimated at 1,7 billion years.


About the authors

N. A. Kanygina

Geological Institute of the Russian Academy of Sciences

Author for correspondence.
Email: kanygina.nadia@gmail.com

Russian Federation, 7, Pyzhevsky lane, Moscow, 119017

A. A. Tretyakov

Geological Institute of the Russian Academy of Sciences

Email: kanygina.nadia@gmail.com

Russian Federation, 7, Pyzhevsky lane, Moscow, 119017

K. E. Degtyarev

Geological Institute of the Russian Academy of Sciences

Email: kanygina.nadia@gmail.com

Russian Federation, 7, Pyzhevsky lane, Moscow, 119017

Сorresponding Member of the Russian Academy of Sciences

K. N. Pang

Institute of Earth Sciences, Academia Sinica

Email: kanygina.nadia@gmail.com

Taiwan, Province of China, 128, Academia Rd, Nangang District, Taipei City, Taiwan

K. L. Van

Institute of Earth Sciences, Academia Sinica

Email: kanygina.nadia@gmail.com

Taiwan, Province of China, 128, Academia Rd, Nangang District, Taipei City, Taiwan

H. Y. Lee

Institute of Earth Sciences, Academia Sinica

Email: kanygina.nadia@gmail.com

Taiwan, Province of China, 128, Academia Rd, Nangang District, Taipei City, Taiwan

J. V. Plotkina

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

Email: kanygina.nadia@gmail.com

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

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