gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2026-17-3-0898WOCYNKgtcrust-2300Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSОСОБЕННОСТИ ТЕРРИГЕННО-КАРБОНАТНОЙ СЕДИМЕНТАЦИИ ДЖИДОТСКОГО ГАЙОТА В ПОЗДНЕМ ДОКЕМБРИИ – РАННЕМ КЕМБРИИSEDIMENTARY FEATURES OF THE LATE PRECAMBRIAN – EARLY CAMBRIAN TERRIGENOUS-CARBONATE DEPOSTS IN THE DZIDOTIAN GUYOThttps://orcid.org/0000-0002-7614-660XИвановаВ. В.IvanovaV. V.

199034, Санкт-Петербург, наб. Макарова, 2 

2 Makarov Emb, Saint Petersburg, 199034

vargeo66@gmail.comhttps://orcid.org/0000-0002-2959-2922КузнецовА. Б.KuznetsovA. B.

199034, Санкт-Петербург, наб. Макарова, 2 

2 Makarov Emb, Saint Petersburg, 199034

https://orcid.org/0000-0002-7052-7815МининаО. Р.MininaO. R.

670047, Улан-Удэ, ул. Сахьяновой, 6а, Республика Бурятия 

6а Sakhyanova St, Ulan-Ude 670047, Republic of Buryatia 

Институт геологии и геохронологии докембрия РАНРоссияInstitute of Precambrian Geology and Geochronology, Russian Academy of SciencesRussian FederationГеологический институт им. Н.Л. Добрецова СО РАНРоссияDobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian Federation202618062026173898898Copyright © Иванова В.В., Кузнецов А.Б., Минина О.Р., 20262026Иванова В.В., Кузнецов А.Б., Минина О.Р.Ivanova V.V., Kuznetsov A.B., Minina O.R.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/2300

Джидинская зона Южного Прибайкалья объединяет андезит-базальтовые и осадочно-вулканогенные породы хохюртовской свиты и песчано-сланцевую флишоидную джидинскую свиту. В статье представлены результаты литогеохимического изучения терригенных отложений хохюртовской и джидинской свит, которые позволили показать эволюцию терригенного осадконакопления в ходе геологического развития Джидотского гайота. Маломощные линзы песчаников хохюртовской свиты и турбидитовые толщи джидинской свиты содержат обломочный материал пород основного или среднего состава и обломки карбонатных пород, слагавших шапки гайотов. Новые геохимические данные показывают, что флишоидная толща джидинской свиты по своим характеристикам близка к отложениям активных, а не пассивных окраин. Геохимические характеристики и высокофракционированные спектры REE песчаников предполагают размыв островодужных комплексов, которые были контаминированы древним коровым материалом на ранних стадиях их внедрения. В составе карбонатных обломков джидинской свиты присутствуют фрагменты карбонатных формаций позднерифейского и раннекембрийского возраста, но отсутствуют обломки вендского возраста, слагающие ближайшую окраину Сибирского кратона. Согласно геохимическим данным, прямое поступление обломочного материала с кратона маловероятно. Формирование терригенных толщ хохюртовской и джидинской свит происходило в глубоководных обстановках преддугового/задугового бассейна на активной окраине Палеоазиатского океана. Полученные данные свидетельствует о значительном удалении Джидинского палеобассейна от Сибирского кратона в позднем докембрии и раннем палеозое.

The Dzhida zone of the southern Baikal region comprises andesite-basalt and sedimentary-volcanic rocks of the Khokhyurt formation and the sandy-shale flyschoid Dzhida formation. This paper presents the results of lithogeochemical study of terrigenous deposits of the Khokhyurt and Dzhida formations, which demonstrate the evolution of terrigenous sedimentation during the geological development of the Dzhida guyot. Thin sandstone lenses of the Khokhyurt formation and turbidite sequences from the Dzhida formation contain mafic or intermediate clasts and fragments of carbonate rocks that composed the guyot caps. New geochemical data indicate that the flyschoid sequence from the Dzhida formation is similar in characteristics to the deposits of active rather than passive margins. Geochemical characteristics and highly fractionated REE patterns of sandstones suggest erosion of island-arc complexes that were contaminated with ancient crustal material during the early stages of their emplacement. Carbonate clasts of the Dzhida formation contain fragments of the Late Riphean and Early Cambrian carbonate formations, but lack the fragments of the Vendian formations that form the closely located margin of the Siberian craton. Nothing in the geochemical data suggests a direct supply of detrital material from the craton. The terrigenous strata of the Khokhyurt and Dzhida formations formed in deep-water fore-arc/back-arc basin settings on the active margin of the Paleo-Asian Ocean. The obtained data indicate that the Dzhida paleobasin was located at a considerable distance from the Siberian craton in the Late Precambrian and Early Paleozoic.

Джидотский гайотПалеоазиатский океанхохюртовская свитаджидинская свитатерригенно-карбонатная седиментацияфлишоидные толщигеохимияредкие и рассеянные элементыостроводужная системаDzidotian guyotPaleo-Asian OceanKhokhurt formationDzhida formationterrigenous-carbonate sedimentationflyschoid sequencesgeochemistryrare and trace elementsisland-arc systemИсследование проведено при поддержке РНФ (грант № 23-17-00192, https://rscf.ru/project/23-17-00192/) с использованием оборудования и инфраструктуры ЦКП АИРИЗ (ИГГД РАН).The study was supported by the RSF (grant No. 23-17-00192, https://rscf.ru/project/23-17-00192/) using equipment and infrastructure of the AIRIS Shared Research Facilities (IPGG RAS).ReferencesAl’mukhamedov A.I., Gordienko I.V., Kuz’min M.I., Tomurtogoo O., Tomurkhuu D., 1996. The Dzhida Zone: A Fragment of the Paleoasian Ocean. Geotectonics 30 (4), 279–294.Al’mukhamedov A.I., Gordienko I.V., Kuz’min M.I., Tomurtogoo O., Tomurkhuu D., 1996. 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