First Results of Study of Detrital Zircons from Late Precambrian Quartzite–Schist Sequences of the Aktau–Mointy Block, Central Kazakhstan

For the first time, the U–Pb age is determined for detrital zircons of quartzite–schist sequences, which are part of the Precambrian basement of the Aktau–Mointy Block (Central Kazakhstan) along with Neoproterozoic felsic volcanic (925–920 Ma) and granitic (945–917 Ma) rocks [6]. We analyzed 219 zir...

Full description

Saved in:
Bibliographic Details
Published in:Doklady earth sciences 2018-03, Vol.479 (1), p.320-323
Main Authors: Kanygina, N. A., Tretyakov, A. A., Kovach, V. P., Degtyarev, K. E., Wang, Kuo-Lun, Kotov, A. B.
Format: Article
Language:English
Subjects:
Age
Chronology
Earth and Environmental Science
Earth Sciences
Geology
Grains
Isotopes
Precambrian
Quartzite
Rock
Rocks
Schist
Schists
Statistical analysis
Zircon
Zirconium
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:For the first time, the U–Pb age is determined for detrital zircons of quartzite–schist sequences, which are part of the Precambrian basement of the Aktau–Mointy Block (Central Kazakhstan) along with Neoproterozoic felsic volcanic (925–920 Ma) and granitic (945–917 Ma) rocks [6]. We analyzed 219 zircon grains from small-grained quartzites of the northern part of the block (Mt. Bol’shoi Alabas) including 206 grains with concordant age (1149–1273, 1276–1975, 2354–2592 Ma). These ages indicate the Mesoproterozoic, Paleoproterozoic, and Neoarchean rocks as provenances. The youngest statistically significant age peak of 1209 Ma indicates that the quartzite–schist sequences accumulated 1200–900 Ma ago (at the end of the Mesoproterozoic and beginning of the Neoproterozoic) prior to the formation of the Early Neoproterozoic felsic rocks and granites.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X18030261