DETRITAL ZIRCONS FROM UPPER PRECAMBRIAN ROCKS OF THE VYM GROUP OF MIDDLE TIMAN (U-Pb AGE AND PROVENANCE)
The article presents the ﬁrst U-Pb data on the age of detrital zircons from clastic sediments of Lunvozh Formation which constitutes the middle part of the Upper Precambrian Vym Group in the Middle Timan. Age data for 61 zircon grains (LA-ICP-MS) cover the range of 991-2758 Ma. Weighted average age of the four youngest zircons yields the age of 1022±44 Ma which provides grounds to assume that sediment accumulation took place in Late Riphean. The accumulation of clastic sediments was controlled mostly with terrigenous material from eroded rock complexes coeval with crystalline complexes of Fennoscandia and Central Russian Belt. Comparison of the ages of detrital zircons from the terrigenous rocks of the Lunvozh Formation, Chetlas Group of the Middle Timan, and Barmin Group of the Northern Timan suggests that these rocks were formed on the Late Precambrian passive margin of Baltica in the same sedimentary basin, and the detrital material came from source areas similar in age.