Vestnik of geosciences Vestnik of geosciences Вестник геонаук 2712-7761 6a84bbf794fbba14f7862cc5 10.19110/geov.2022.7.3 Научные статьи Scientific articles Научные статьи Cementstones origin in the Upper Silurian lagoon deposits of the Northern Urals Происхождение цементолитов в верхнесилурийских лагунных отложениях Северного Урала Пономаренко Е. С. Ponomarenko E. S. ФГБУ ФИЦ «Коми научный центр Уральского отделения Российской академии наук» RU FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences" RU 08 09 2022 08 09 2022 20 31 28 03 2022 © 2022 Пономаренко Е.С. © 2022 Ponomarenko E.S. 2022 Пономаренко Е. С. Ponomarenko E. S. https://ras.editorum.ru/en/nauka/publications/6a84bbf794fbba14f7862cc5/view

Отложения верхнесилурийской проксимальной зарифовой лагуны, широко развитые в бассейне р. Илыч, были детально изучены ранее. Одними из удивительных образований в них являются крупные (до 1.0 м в поперечнике) участки с зональными цементами (цементолиты), на происхождение которых имеются различные точки зрения. Образцы цементолитов, которые были изучены микроскопическим и изотопным методами, имеют сложную морфологию, характеризующуюся чередованием горизонтальных и вертикальных элементов. Внутреннее их строение обусловлено ростом (от стенок к центру) зонального радиально-фибрового кальцита с тонкими прослоями мелко- и тонкозернистых доломитов. Большинство предлагаемых трактовок (перекристаллизованные строматопороидеи, структуры строматактис или каналы метановых источников) были отброшены, так как одна или несколько характеристик цементолитов противоречили им. Палеокарстовая интерпретация по крайней мере не имеет противоречий по всем трем рассмотренным характеристикам: морфологической, литологической и геохимической. В общих чертах проведена реконструкция формирования палеокарста.

The Upper Silurian proximal lagoon deposits, widely developed in the Ilych River basin, were previously studied in detail. One of the surprising fabrics in them is large (up to 1.0 m in diameter) areas with zonal cements (cementstones), there are different points of view on their origin. The samples of these cementstones investigated by microscopic and isotopic methods, have a complex morphology characterized by horizontal and vertical element alterations. This internal texture is conditioned by centripetal zonal radial-fibrous calcite growth with thin layers of fine-grained dolomites. Most of the proposed interpretations (recrystallized stromatoporoids, stromatactis fabric, or methane spring cannels) were rejected because one or more cementstone features contradicted them. The paleokarst interpretation at least has no contradictions in all three characteristics considered: morphological, lithological, and geochemical. The 13C values of cementstones (and the host rocks at the boundary with them) vary within 0.9–1.95 ‰ (PDB), while the 18O values have narrower variations (25.51–25.88 ‰ SMOW in one case and 25.11–25.48 ‰ SMOW in the other case). In addition, these 18O values are higher than those in the host rocks.

 верхний силур цементолиты палеокарст изотопия С и О Upper Silurian cementstones paleokarst C and O isotopes

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