Provenance composition and features of geological evolution of the Late Vendian foreland basin of the Timan orogen |
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| Authors: | A V Maslov D V Grazhdankin V N Podkovyrov M V Isherskaya M T Krupenin G A Petrov Yu L Ronkin E Z Gareev O P Lepikhina |
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| Institution: | 1.Zavaritskii Institute of Geology and Geochemistry, Ural Branch,Russian Academy of Sciences,Yekaterinburg,Russia;2.Institute of Petroleum Geology and Geophysics, Siberian Branch,Russian Academy of Sciences,Novosibirsk,Russia;3.Institute of Precambrian Geology and Geochronology,Russian Academy of Sciences,St. Petersburg,Russia;4.Geological Institute, Ufa Scientific Center,Russian Academy of Sciences,Ufa,Bashkortostan, Russia;5.Presidium of the Ufa Scientific Center,Russian Academy of Sciences,Ufa,Bashkortostan, Russia |
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| Abstract: | The provenance composition and geological evolution of different segments in the distal zone of the Late Vendian foreland
basin of the Timan orogen were deciphered on the basis of sequence stratigraphic reconstructions and precision geochemical
data on the Upper Vendian fine-grained terrigenous rocks from the Southeast White Sea region, Vychegda, Verkhnekama, and Shkapovo-Shikhan
basins, and the Kvarkush-Kamennogorsk and Bashkirian meganticlinoriums. The Upper Vendian of the Southeast White Sea region
is subdivided into four sequences: Agma, Solza, Zimnie Gory, and Erga. The tracing of sequence boundaries and lateral facies
associations from the Southeast White Sea Region to the South Urals made it possible to identify the main stages of the evolution
of sedimentary filling of the foreland basin: (I) shallow water epiplatformal basin, (II) isolated basin, (III) lowstand system
tract, and (IV) progradation of delta platforms. Position of data points of the Upper Vendian shales, silty mudstones, and
mudstones plotted in the diagrams Th-La, Ni-Cr, GdN/YbN-Eu/Eu*, Sc-Th/Sc, La/Sm-Sc/Th, and Co/Hf-Ce/Cr, together with their REE systematics and data on Nd model ages indicates that
the Proterozoic, including Neoproterozoic rocks of the Timan thrust-folded belt served as the main source for fine aluminosiliciclastic
material in the distal zones of the Timan foreland basin. Obtained results are consistent with the concept that the Vendian
stage of the evolution of the Eastern European platform is related to the intense input of allochthonous material in its peripheral
area owing to the activation of orogenic processes in the adjacent mobile belts and allow us to significantly specify the
paleogeographical reconstructions. |
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