gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-4-0905NSWEUXgtcrust-2352Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSИСТОЧНИКИ СНОСА И СТРУКТУРНЫЕ ХАРАКТЕРИСТИКИ МИОЦЕНОВОГО ФРАГМЕНТА РАЗРЕЗА МОНАСТЫРСКОГО ФЛИША, СЕВЕРНАЯ ЧАСТЬ АБХАЗСКОЙ ЗОНЫ БОЛЬШОГО КАВКАЗАSOURCE AREAS AND STRUCTURAL CHARACTERISTICS OF THE MIOCENE FRAGMENT OF THE MONASTYRSKY FLYSCH SECTION, NORTHERN PART OF THE ABKHAZ ZONE OF THE GREATER CAUCASUShttps://orcid.org/0009-0004-1707-285XМахиняЕ. И.MakhinyaE. I.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

eugenemahinya@yandex.ruhttps://orcid.org/0000-0002-7285-6460КузнецовН. Б.KuznetsovN. B.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0002-0495-1466РоманюкТ. В.RomanyukT. V.

123242, Москва, ул. Большая Грузинская, 10, стр. 1

10-1 Bolshaya Gruzinskaya St, Moscow 123242

https://orcid.org/0000-0002-8148-4267КолодяжныйС. Ю.KolodyazhnyS. Yu.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0003-3732-4183УстиноваМ. А.UstinovaM. A.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

https://orcid.org/0000-0003-2283-8747ДанцоваК. И.DantsovaK. I.

119991, Москва, Ленинский пр-т, 65

65 Leninsky Ave, Moscow 119991

https://orcid.org/0000-0002-4661-0627ШалаеваЕ. А.ShalaevaE. A.

119017, Москва, Пыжевский пер., 7, стр. 1

7-1 Pyzhevsky Ln, Moscow 119017

Геологический институт РАНРоссияGeological Institute, Russian Academy of SciencesRussian FederationИнститут физики Земли им. О.Ю. Шмидта РАНРоссияSchmidt Institute of Physics of the Earth, Russian Academy of SciencesRussian FederationРоссийский государственный университет нефти и газа (национальный исследовательский университет) им. И.М. ГубкинаРоссияNational University of Oil and Gas "Gubkin University"Russian Federation202619082026174905905Copyright © Махиня Е.И., Кузнецов Н.Б., Романюк Т.В., Колодяжный С.Ю., Устинова М.А., Данцова К.И., Шалаева Е.А., 20262026Махиня Е.И., Кузнецов Н.Б., Романюк Т.В., Колодяжный С.Ю., Устинова М.А., Данцова К.И., Шалаева Е.А.Makhinya E.I., Kuznetsov N.B., Romanyuk T.V., Kolodyazhny S.Y., Ustinova M.A., Dantsova K.I., Shalaeva E.A.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.gt-crust.ru/jour/article/view/2352

Представлены результаты комплексного исследования флишевых толщ, распространенных в северной части Абхазской зоны Большого Кавказа (монастырский флиш). Выполнен микропалеонтологический анализ (нанопланктон), U-Pb датирование зерен детритового циркона (метод LA-ICP-MS) и структурно-кинематические исследования. Установлен миоценовый (либо моложе) возраст относимого ранее к олигоцену фрагмента изученного разреза монастырского флиша, источники его обломочного материала, предложена интерпретация проявленных во флишевых толщах деформаций, генетически связанных с Монастырским разломом. Монастырский разлом парагенетически связан с формированием Воронцовского покрова и сохранял свою активность, по-видимому, вплоть до новейшего времени. Возраст Воронцовского покрова, а также возраст сопряженных с ним деформаций не древнее конца миоцена. Результаты изучения детритового циркона из песчанистых алевролитов миоценового фрагмента монастырского флиша указывают на то, что этот флиш не является синорогенным комплексом новейшего Кавказского орогена. Подавляющая часть зерен циркона из этих пород, вероятнее всего, принесена со стороны расположенных к северу от современного орогена Большого Кавказа структур с платформенным стилем строения (древней Восточно-Европейской и молодой эпигерцинской Скифской платформ) и структур их складчатого обрамления.

Presented here are the results of a comprehensive study of flysch successions common in the northern Abkhaz zone of the Greater Caucasus (Monastyrsky flysch). There have been micropaleontological analysis (nannoplankton), U-Pb dating of detrital zircons (LA-ICP-MS), and structural-kinematic studies. The fragment of the Monastyrsky flysch section, previously assigned to the Oligocene, has been dated back to the Miocene (or younger) epoch, its source areas have been identified, and an approach has been proposed for interpretation of flysch succession deformations, genetically related to the Monastyrsky fault. The Monastyrsky fault is paragenetically linked to the formation of the Vorontsov nappe and apparently remained active until recent times. The Vorontsov nappe, as well as the associated deformations, are not older than the Late Miocene. Study results of detrital zircons from sandy siltstones of the Miocene fragment of the Monastyrsky flysch have indicated that this flysch is not synorogenic with the Caucasus neoorogen. Most of the zircon grains from these rocks were most likely transported from platform-like structures northward of the Greater Caucasus orogen (ancient East European and young epi-Hercynian Scythian platforms) and their surrounding fold structures.

 

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The authors declare that there are no conflicts of interest present.