First U-Pb dates for detrital zircons from deposits of Serebryanka Group (Upper Proterozoic,Middle Urals) |
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Authors: | A V Maslov G M Vovna V I Kiselev M T Krupenin Yu L Ronkin |
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Institution: | 1.Zavaritskii Institute of Geology and Geochemistry, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia;2.Far East Geological Institute,Far East Branch of the Russian Academy of Sciences,Vladivostok,Russia |
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Abstract: | The results of application of the LA-ICP-MS method for analysis of U-Pb ages of detrital zircons from Serebryanka Group (Middle
Urals) has been presented for the first time. It has been found that the detrital zircon population in tillite-like conglomerates
of the Tany Formation is represented nearly in equal shares by grains with Neoarchean and Paleoproterozoic U-Pb ages. This
allows the basement crystalline rocks from the eastern part of the East European Craton to be considered as the principal
source of aluminosilicate clastic material in the beginning of the Serebryanka. The population of detrival zircons in sandstones
from the Kernos Formation consists of Meso- and Neoarchean (approximately 15%), Paleoproterozoic (∼60%), and Mesoproterozoic
(∼26%) zircon grains. Comparison of the obtained data with the materials on detrital zircons from Tonian and Ediacarian sandstones
in the southern Urals has shown that the principal role in formation of Tonian and Ediacaran sedimentary sequences was played
by the products of Mid- and Late Paleoproterozoic crystalline rock erosion in the craton socle. In addition to this, accumulation
of the Serebryanka Group took place with visible participation of more ancient—Early Paleoproterozoic, Neo- and Mesoarchean—rock
associations on the paleo-water catchment areas. The end of the Serebryanka period differed from its beginning by the additional
appearance of Mesoproterozoic complexes in alimentation zones; for comparison, the role played by these complexes in formation
of Ectasian-Ediacarian deposits of the adjacent southern Urals segment is insufficient, judging by the currently available
data. All these facts may indicate that there are significant differences in the spatiotemporal distribution of clastic material
sources for Upper Precambrian deposits in the West Megazone of the southern and middle Urals. |
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