The first results of U-Pb LA-SF-ICP-MS-dating of detrital zircons from terrigenous deposits of the Miniseishor suite of the Nyarovei series of the Harbei anticlinorium of the Polar Urals are presented. The series has a presumably Middle Riphean age and lies at the base of the section of the Polar Ural Upper Precambrian. The data obtained give grounds to limit the lower age interval for the formation of sediments of the Minisejshor suite abroad 660 million years ago. Allotment the Nyarovei series as a Middle Riphean straton is erroneous. Formation of the whole cut the Nyarovei series occurred in a relatively narrow age range at the end of the late Riphean. The dominant role in the formation of deposits of the entire series belonged to the products of erosion close arrays of deeply metamorphosed rocks.

Впåðвыå пðîвåдåíà ñðàвíèòåëьíàя хàðàкòåðèñòèкà öèðкîíîв èз ìåòàîñàдî÷íых, в òîì ÷èñëå óãëåðîдñîдåðжàщèх, вåðхíåпðîòåðîзîйñкèх îòëîжåíèй íяðîвåйñкîй ñåðèè è íåìóðъюãàíñкîй ñвèòы Пîëяðíîãî Óðàëà. Èзó÷åíèå òèпîхèìè÷åñкèх îñîбåííîñòåй öèðкîíîв пîкàзàëî îòëè÷èя вî вíóòðåííåì ñòðîåíèè è хèìè÷åñкîì ñîñòàвå ìèíåðàëà. Дëя ìåòàîñàдî÷íых бåзóãëåðîдèñòых пîðîд хàðàкòåðíà ðîвíàя пîвåðхíîñòь è îдíîðîдíîå ñòðîåíèå зåðåí öèðкîíà. В öèðкîíàх èз óãëåðîдñîдåðжàщèх îòëîжåíèй вíóòðåííåå ñòðîåíèå íåîдíîðîдíîå, пðèñóòñòвóюò вòîðè÷íыå èзìåíåíèя. В óãëåðîдñîдåðжàщèх îòëîжåíèях íяðîвåйñкîй ñåðèè è íåìóðъюãàíñкîй ñвèòы в ñîñòàвå öèðкîíà îòìå÷àåòñя óðàí. Цèðкîí пåðвîíà÷àëьíî ìîã быòь îбîãàщåí óðàíîì, ëèбî îбðàзîвàíèå óðàíà в èзíà÷àëьíî дåфîðìèðîвàííых öèðкîíàх ìîãëî быòь ñвязàíî ñ ãèпåðãåííыìè пðîöåññàìè. В óãëåðîдñîдåðжàщèх îòëîжåíèях ìèíèñåйшîðñкîй ñвèòы в öèðкîíàх пîìèìî óðàíà пðèñóòñòвóюò èòòðèй, òîðèй è ñкàíдèй.

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