THE RESULTS OF THE U/PB DATING OF DETRITAL ZIRCONS FROM THE PRECAMBRIAN AND PALEOZOIC SANDSTONES OF THE WESTERN PART OF BASHKIR UPLIFTS (THE SOUTHERN URALS)

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Abstract


There are the results of U-Pb dating of detrital zircons from the sandstones of the Bashkir uplift of the Southern Urals and the analysis of U-Pb-isotopic ages of detrital zircons from the six stratigraphic levels of the Riphean-Paleozoic section in the region.It is shown that in the long history of accumulation sedimentary strata of the Bashkir uplift may be allocated a special time interval. This interval is separated from the rest of the history of accumulation of sedimentary by boundaries of abrupt change in the composition of debris entering the sedimentary basins. There is a very great similarity of the spectra ages of detrital zircons from rocks of this range - the Late Early Cambrian lithic - and Ordovician quartzose sandstone. The proposed interpretation of the destruction Vend-Early Cambrian sedimentary strata, transport and accumulation of recycled quartz clastic material resulted in the formation ordovician essentially quartz sandstones.

E S Pyzhova

Peoples’ Friendship University of Russia

Engineering faculty

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