gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2024-15-5-0789ECYYOUgtcrust-1925Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ И ПЕТРОГЕНЕЗ ДОЛЕРИТОВ р. МАРА (ПРИСАЯНСКИЙ КРАЕВОЙ ВЫСТУП ФУНДАМЕНТА ЮЖНОЙ ЧАСТИ СИБИРСКОГО КРАТОНА)AGE AND PETROGENESIS OF DOLERITES ON THE MARA RIVER (SAYAN MARGINAL UPLIFT OF THE BASEMENT, SOUTHERN PART OF THE SIBERIAN CRATON)https://orcid.org/0000-0001-9445-9960ИзбродинИ. А.IzbrodinI. А.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

izbrodin@igm.nsc.ruhttps://orcid.org/0000-0001-5191-277XДорошкевичА. Г.DoroshkevichА. G.

630090, Новосибирск, пр-т Академика Коптюга, 3

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

3 Academician Koptyug Ave, Novosibirsk 630090

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

https://orcid.org/0000-0002-4584-371XКотовА. Б.KotovА. B.

199034, Санкт-Петербург, наб. Макарова, 2

2 Makarova Emb, Saint Petersburg, 199034

СальниковаЕ. Б.SalnikovaЕ. B.

199034, Санкт-Петербург, наб. Макарова, 2

2 Makarova Emb, Saint Petersburg, 199034

ИзохА. Э.IzokhА. E.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

https://orcid.org/0000-0002-9914-8309ЛетниковаЕ. Ф.LetnikovaЕ. F.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

ИвановА. В.IvanovА. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН ; Геологический институт им. Н.Л. Добрецова СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences ; Dobretsov Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и геохронологии докембрия РАНРоссияInstitute of Precambrian Geology and Geochronology, Russian Academy of SciencesRussian Federation202419102024155789789Copyright © Избродин И.А., Дорошкевич А.Г., Котов А.Б., Сальникова Е.Б., Изох А.Э., Летникова Е.Ф., Иванов А.В., 20242024Избродин И.А., Дорошкевич А.Г., Котов А.Б., Сальникова Е.Б., Изох А.Э., Летникова Е.Ф., Иванов А.В.Izbrodin I.А., Doroshkevich А.G., Kotov А.B., Salnikova Е.B., Izokh А.E., Letnikova Е.F., Ivanov А.V.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/1925

Рассмотрены петролого-геохимические особенности и возраст долеритов, распространенных в бассейнах рек Мара, Каменка и Уват. Изотопно-геохронологические данные, полученные для бадделеита, позволили отнести становление этих пород к временному интервалу 1600–1620 млн лет, который интерпретируется как время их внедрения. Показано, что долериты по возрасту представляют собой отдельное геологическое событие, не зависимое от формирования неопротерозойского нерсинского габбро-долеритового комплекса, распространенного на данной территории. Геохимические данные и Sm-Nd изотопные характеристики указывают на то, что родоначальный расплав генерировался из метасоматизированной литосферной мантии.

This work focuses on petrological-and-geochemical features, as well as age of dolerites widespread within the basins of the Mara, Kamenka and Uvat rivers. The isotope geochronological data acquired for baddeleyite allowed referring origination of these rocks to the time interval 1600–1620 Ma, interpreted as the time of their emplacement. It was ascertained, that the age of dolerites represents particular geological event proceeding independently of formation of Neoproterozoic Nersinsk gabbro-dolerite complex. The Sm-Nd isotope signature indicates that parent melt generated from the metasomatic lithosphere mantle.

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