geologiâ. Teoriâ i practika (RUS) URL: http://www.ngtp.ru ______________________________________________________________________________________ © Нефтегазовая геология. Теория и практика.-2018.-Т.13.-№2.http://www.ngtp.ru/rub/2/20_2018.pdf 2 Рис. 1. Cтратиграфическая схема венлокских отложений Западного Урала, гряды Чернышева и Хорейверской впадины с предлагаемой автором новой свитой ISSN 2070-5379 Neftegasovaâ geologiâ. Teoriâ i practika (RUS) URL: http://www.ngtp.ru
Èíñòèòóò ãåîëîãèè ÔÈÖ Êîìè ÍÖ ÓðÎ ÐÀÍ, ÑûêòûâêàðÍà çåìíîé ïîâåðõíîñòè íåò õèìè÷åñêîé ñèëû, áîëåå ïîñòîÿííî äåéñòâóþùåé, à ïîòîìó è áîëåå ìîãóùåñòâåííîé ïî ñâîèì êîíå÷íûì ïîñëåäñòâèÿì, ÷åì aeèâûå îðãàíèçìû, âçÿòûå â öåëîì. È ÷åì áîëåå ìû èçó÷àåì õèìè÷åñêèå ÿâëåíèÿ áèîñôåðû, òåì áîëåå ìû óáåaeäàåìñÿ, ÷òî íà íåé íåò ñëó÷àåâ, ãäå áû îíè áûëè íåçàâèñèìû îò aeèçíè. Â. È. Âåðíàäñêèé, 1926 Ñïåêòðîñêîïè÷åñêèå, ýëåêòðîííî-ìèêðîñêîïè÷åñêèå, èçîòîïíûå, ðåíòãåíîñòðóêòóðíûå èññëåäîâàíèÿ ïî óòî÷íåíèþ ãåíåçèñà êðèïòî-è ìèêðîçåðíèñòûõ èçâåñòíÿêîâ âåðõíåãî îðäîâèêà íà Ñåâåðíîì Óðàëå è ìåëêî-è ìèêðîçåðíèñòûõ äîëîìèòîâ âåíëîêà íèaeíåãî ñèëóðà íà ïîäíÿòèè ×åðíûøåâà âûÿâèëè èõ áèîõåìîãåííóþ ïðèðîäó. Ñîãëàñíî äàííûì ïàðàìåòðîâ ýëåìåíòàðíîé ÿ÷åéêè, äîëîìèòû èìåþò ïåðâè÷íî-îñàäî÷íóþ ïðèðîäó. Âûÿâëåííûå ôàçû ðàçíîé óïîðÿäî-÷åííîñòè óãëåðîäèñòîãî âåùåñòâà â êàëüöèòå (ñòàäèÿ õëîðèòîâîãî ìåòàìîðôèçìà) è äîëîìèòå (äåáèòóìèíèçèðîâàííîå ÎÂ) îòðàaeàþò ðàçëè÷íóþ ñòåïåíü èõ ïîñòñåäèìåíòàöèîííîãî ïðåîáðàçîâàíèÿ êàê âëèÿíèÿ ïðîöåññîâ ðàçíîé èíòåíñèâíîñòè òåêòîíè÷åñêèõ ñîáûòèé íà ïîðîäû. Èçîòîïíûå äàííûå äîëîìèòîâ â ýòîì ñëó÷àå îòðàaeàþò ôàêòè÷åñêè ïåð-âè÷íûå èçîòîïíûå ñîîòíîøåíèÿ 13 Ñ (-3.5…-2.8 ‰), 18 O (22.4-24.1 ‰), õàðàêòåðíûå äëÿ âíóòðèøåëüôîâîé îïðåñíåííîé çàðèôîâîé ëàãóíû. Øèðîêîå ðàñïðîñòðàíåíèå ôîññèëèçèðîâàííûõ áèîïëåíîê (ãëèêîêàëèêñà), ôðàìáîèäàëüíûõ ïèðèòîâ è ïðèñóòñòâèå áàêòåðèîìîðôíûõ ñòðóêòóð ñâèäåòåëüñòâóåò îá àêòèâíîì ó÷àñòèè ìèêðîáíûõ îðãàíèçìîâ â ãåíåçèñå èññëåäîâàííûõ ìèêðîçåðíèñòûõ èçâåñòíÿêîâ è äîëîìèòîâ.Êëþ÷åâûå ñëîâà: èçâåñòíÿêè, äîëîìèòû, îðãàíè÷åñêîå âåùåñòâî, 13 Ñ, 18 O, ôîññèëèçèðîâàííûé ãëèêîêàëèêñ, áàêòåðèîìîðôû, ôðàìáîèäàëüíûé ïèðèò.There is no chemical force on the earths surface that is more constantly acting, and therefore more powerful in its final consequences, than living organisms taken as a whole. The more we study the chemical phenomena of the biosphere, the more we are convinced that there are no cases on it where they would be independent of life.Vladimir I. Vernadsky, 1926 Electron microscopic, isotopic, X-ray diffraction and spectroscopic studies to clarify the genesis of crypto-and micrograined limestones of the Upper Ordovician in the Northern Urals and fine-and micro-grained dolomites of the Wenlockian in the Chernyshev Uplift revealed their bio-chemogenic nature. According to the data of the unit cell parameters, dolomites are of primary sedimentary nature. The revealed phases of different ordering of carbonaceous matter in calcite (chlorite stage of metamorphism) and dolomite (debituminated OM) reflect a different degree of their post-sedimentation transformation as a result of processes of different intensity of tectonic events on rocks. The isotopic data of primary sedimentary dolomites in this case actually reflect the primary isotopic ratios 13 Ñ (-3.5 ... -2.8 ‰), 18 O (22.4-24.1 ‰), characteristic of the offshore somewhat desalinated back-reef lagoon. The wide distribution of fossilized biofilms (glycocalyx), framboidal pyrites, and the presence of bacteriomorphic structures in...
Research subject. Wenlock deposits in the Subpolar Urals and southern part of the Chernyshev Ridge. Materials and methods. Carbonate and terrigenous-carbonate rock samples from sections of the Subpolar Urals (outcrops 212, 217) and the southern part of the Chernyshev Ridge (outcrop 479) were studied by isotope analysis of carbonate carbon and oxygen.Results. The isotopic composition of the studied sections varies across a wide range of δ13С (–6.4…–0.05‰) and δ18O (20.0–26.9‰). Therefore, three time intervals characterized by distinctive isotopic characteristics can be distinguished, roughly corresponding to early Sheinwoodian (I), late Sheinwoodian (II) and Homerian (III). Interval I is characterized exclusively by the rocks of outcrop 479 with δ13С (–3.6…–3.0‰) and δ18O (22.4–23.6‰). In Interval II, the average values of isotopic characteristics of outcrop 479 indicate a tendency to weighting carbon (–5.5…–3.5‰) and somewhat heavier oxygen (23.2–25.2‰) isotopes. In outcrop 212, the average isotopic values for carbon and oxygen vary from –2.9 to –1.3‰ and from 21.9 to 24.3‰, respectively. In outcrop 217, the average values are δ13C (–1.8…–0.8‰) and δ18O (22.4–25.4‰). In Interval III, the average values of carbon isotopic composition in outcrop 479 are becoming heavier from –2.5 to –0.7‰. In outcrop 212, the isotopic values of oxygen (21.9–23.1‰) and carbon (–4.9…–2.5‰) tend to become weighting; however, in outcrop 217, the average isotopic values of δ13C (–1.9…–0.5‰) and δ18O (22.3–24.5‰) remain constant. The conducted litho-facial studies showed that the weighting carbon isotopic composition ranging from –6.4…to –3.0‰ is associated with an increase in microbial activity in sediments, the manifestation of vadose-phreatic conditions, and the intake of light carbon dioxide with a flow of terrigenous material from the earth. In the latter case, oxygen isotopic values are also the most lightweight (20.0–23.0‰).Conclusions. The obtained isotopic characteristics of the Wenlock rocks under study indicate the expedience of identifying three time intervals and their correlation with paleogeographic reconstructions of Wenlockian sedimentation in the Timan-northern Ural region.
The evolution of the Northern-Uralian sedomentaru basin in the Paleozoic is characterized on the basis of sedimentology, cyclic pattern and facies fistibution data. Paleoreconstructions of sedimentary environments were carried out applying new ideas on the Paleozoic stratigraphy. The event boundaries that changed the character of sedimentation are shown, and sedimentation models are built.
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