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Institute of Geology Komi SC UB RAS, Syktyvkar Ïðåäñòàâëåíû ðåçóëüòàòû ëèòîëîãî-ìèíåðàëîãî-ãåîõèìè÷åñêèõ èññëåäîâàíèé ñðåäíåè âåðõíåîðäîâèêñêèõ ãëèíèñòî-êàðáîíàòíûõ ïîðîä ñ øàìîçèòîâûìè îîèäàìè â ðàçíîôàöèàëüíûõ ðàçðåçàõ áîëüøåêîñüþíñêîé ñâèòû â áàññåéíå ð. Èëû÷ íà Ñåâåðíîì Óðàëå. Â ñèäåðèò-øàìîçèòîâûõ îîèäàõ âûÿâëåíû íàíîêîêêîâûå è íàíîòðóá÷àòûå áàêòåðèîìîðôû è ìèíåðàëèçîâàííûå ìèêðîáíûå ïëåíêè. Ïîñëåäíèå îáíàðóæèâàþò áîëüøîå ñõîäñòâî ñ ãëèêîêàëèêñîì — ïðîäóêòîì æèçíåäåÿòåëüíîñòè ñîâðåìåííûõ áàêòåðèé. Îñíîâíûå ìèíåðàëû â îîèäàõ ïðåäñòàâëåíû òðåìÿ ðàçíîâèäíîñòÿìè øàìîçèòà, êàðáîíàòàìè ðÿäà êàëüöèò — ñèäåðèò, ôîñôàòàìè, ñóëüôàòàìè, îêñèäàìè, ñóëüôèäàìè, âêëþ÷àÿ ôðàìáîèäàëüíûé ïèðèò. Èçîòîïíûé ñîñòàâ óãëåðîäà è êèñëîðîäà â ïîðîäàõ (δ13Ñ = 0.6—0.9 ‰, δ18Î = 21.7—22.6 ‰) è â îîèäàõ (δ13Ñ = –0.16...–2.86 ‰, δ18Î = 20.57—22.31 ‰) îòðàæàåò ïîñòóïëåíèå â áàññåéí ñåäèìåíòàöèè ïðåñíûõ ðå÷íûõ âîä. Èçîòîïíûé ñîñòàâ óãëåðîäà â ÎÂ ïîðîäû (–28.72 ‰) ãîâîðèò î ñóùåñòâåííîì âëèÿíèè â ôîðìèðîâàíèè îñàäêîâ áèîãåííîãî óãëåðîäà. Îáðàçîâàíèå ñðåäíåè âåðõíåîðäîâèêñêèõ ñèäåðèò-øàìîçèòîâûõ îîèäîâ ïðîèñõîäèëî â ïðèýêâàòîðèàëüíîì ìîðñêîì áàññåéíå ñ ãàçîôëþèäíûìè ïðèäîííûìè âûñà÷èâàíèÿìè è àêòèâíîé äåÿòåëüíîñòüþ ñóëüôàòðåäóöèðóþùèõ áàêòåðèé.

Biochemogenic origin of the ordovician chamosite in the Northern Urals