Some general features of the Western Urals terrigenous deposits formation: Synthesis of U-Pb isotopic age data of detrital zircon and geochemical investigation of the sales and mudstones
A. V. Maslov,
G. A. Mizens,
G. M. Vovna,
E. S. Pyzhova,
N. B. Kuznetsov,
V. I. Kiselev,
Yu. L. Ronkin,
A. Z. Bikbaev,
T. V. Romanyuk
Affiliations
A. V. Maslov
Institute of Geology, Ufimian Scientific Centre of RAS
G. A. Mizens
Institute of Geology and Geochemistry, Urals Branch of RAS
G. M. Vovna
Far East Geological Institute, Far East Branch of RAS
E. S. Pyzhova
Peoples’ Friendship University of Russia
N. B. Kuznetsov
Russian State Oil and Gas University; Geological Institute of RAS
V. I. Kiselev
Far East Geological Institute, Far East Branch of RAS
Yu. L. Ronkin
Institute of Geology and Geochemistry, Urals Branch of RAS
A. Z. Bikbaev
Institute of Geology and Geochemistry, Urals Branch of RAS
T. V. Romanyuk
Russian State Oil and Gas University; Institute of Physics of the Earth of RAS
The data on U-Pb-isotopic ages of detrital zircons from Riphean-Paleozoic and Early Triassic sandstones and geochemistry of shales and mudstones of the Western Urals are discussed. The ages of detrital zircons suggest that the sand material for sedimentary basins existed at the junction of the East European Platform and Urals during more than one and a half billion years, has been brought mainly from the platform. Tectonogenic sands (according F.J. Pettijohn and co-authors) as a part of the Western Urals sedimentary associations play a significant role only in Vendian and in the last third of the Paleozoic. During the rest of the time was dominated cratonogenic sands. According to clay rocks geochemical characteristics during the time from 1750 to 250 Ma, there are unidirectional trend in the composition of the erosion areas: increasing mafic and ultramafic igneous rocks which reached to maximum in Early Permian time.
