Early crust of the Podolia Domain of the Ukrainian Shield: Isotopic age of terrigenous zircons from quartzites of the Bug Group

Detrital zircons of the ancient metasedimentary rocks bear important information about the early crust of the Earth. In this work, the early crust in the west of the Ukrainian Shield was studied using U-Pb dating of terrigenous zircons from metasedimentary rocks (quartzites) of the lower parts of th...

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Published inStratigraphy and geological correlation Vol. 23; no. 6; pp. 555 - 567
Main Authors Bibikova, E. V., Fedotova, A. A., Claesson, S., Stepanyuk, L. M.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.11.2015
Springer Nature B.V
Subjects
Archaeology
Earth and Environmental Science
Earth Sciences
Geology
Geophysics/Geodesy
Historical Geology
Ions
Quartz
Rocks
Sedimentary basins
Sedimentology
Sediments
Structural Geology
Eastern Europe
U-Pb isotope age
NORDSIM secondary ion mass spectrometer
Archean
East European Craton
early crust
terrigenous zircon
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Summary:Detrital zircons of the ancient metasedimentary rocks bear important information about the early crust of the Earth. In this work, the early crust in the west of the Ukrainian Shield was studied using U-Pb dating of terrigenous zircons from metasedimentary rocks (quartzites) of the lower parts of the Bug Group (Kosharo-Aleksandrovka Formation) of the Podolia Domain and through Sm-Nd isotopic investigation of these rocks. The Nd model age of rocks is 3.4–3.1 Ga. Detrital zircons were studied in two samples of quartzites. The cathodoluminescent images of most zircons support their clastic origin. More than 150 zircon grains were studied on an ion microprobe. The isotope age of zircons is 3775–2000 Ma. These results were compared with previous results of study of terrigenous zircons from garnet schists of the Zaval’e quarry located closely to the studied area. It is concluded that both Paleoarchean and Meso- to Neoarchean rocks were destroyed during formation of terrigenous rocks of the Bug Group. The different amount of ancient zircons in quartzites and garnet schists indicates the different remoteness of the most ancient rocks from sedimentary basins.
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ISSN:0869-5938
1555-6263
DOI:10.1134/S0869593815060027