U-Pb age of detrital zircons from Neoproterozoic placers of the erementau-niyaz massif as a reflection of stages of Precambrian tectono-magmatic evolution of northern Kazakhstan

V. P. Kovach, A. V. Ryazantsev, A. A. Tretyakov, K. E. Degtyarev*, E. V. Tolmacheva, Kuo Lun Wang, A. B. Kotov, Sun Lin Chun, Bor Min Jahn

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

A typical feature of the Precambrian complexes of the Kokshetau, Ishkeolmess, Erementau- Niyaz, and Aktau-Dzhungaria massifs of Northern and Central Kazakhstan is the presence of the end Meso- proterozoic-beginning of the Neoproterozoic quartzite-schist sequences in these sections. The lower and upper parts of these sequences are mostly composed of schists with interlayers of quartzites and marbles and of quartzitic sandstones, respectively. It is suggested that the quartzite-schist sequences represent the sub- platform cover of a large continental block and were formed in the regressive basin with widely abundant facies of submarine deltas and a littoral shoal. The presence of horizons and the lenses enriched in zircon- rutile heavy concentrate with the amount of accessory minerals of 10-70% characterizes the quartzite-schist sections of the Kokshetau and Erementau-Niyaz massifs. The U-Pb age of zircons from one such locality in the central part of the Erementau-Niyaz massif was analyzed by LA-ICP-MS. The Concordia ages of zir- cons are in the intervals 1041 ± 13-1519 ± 14, 1623 ± 14-1931 ± 14, and 2691 ± 14-2746 ± 14 Ma. One age was 2850 ± 14 Ma. The age distribution is characterized by clear peaks of 1.08, 1.20. 1.34, 1.46, 1.65, 1.89, and 2.70 Ga and weak peaks of 1.13 and 1.68 Ga. The age of the majority of zircons ranges from 1309 ± 14 to 1519 ± 14 Ma. Our data indicate that mostly Neoproterozoic rocks with a subordinate role of Paleoprotero- zoic and Neoarchean complexes served the feeding sources for the quartzite-schist sequence of the Eremen- Tau-Niyaz massif. The Mesoproterozoic and Paleoproterozoic events identified for the detrital zircons of the Erementau-Niyaz massif are completely manifested only in Laurentia. In the first approximation, these events coincide with the assembly and breakup of the Columbia/Nuna supercontinent (∼1650-1580 and 1450-1380 Ma) and assembly of the Rodinia supercontinent (1300-900 Ma).

Original languageEnglish
Pages (from-to)254-258
Number of pages5
JournalDoklady Earth Sciences
Volume455
Issue number1
DOIs
Publication statusPublished - 2014
Externally publishedYes

Fingerprint Dive into the research topics of 'U-Pb age of detrital zircons from Neoproterozoic placers of the erementau-niyaz massif as a reflection of stages of Precambrian tectono-magmatic evolution of northern Kazakhstan'. Together they form a unique fingerprint.

  • Cite this