gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2022-13-5-0674gtcrust-1585Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSВОЗРАСТ И ИСТОЧНИКИ ОБЛОМОЧНОГО МАТЕРИАЛА МЕТАОСАДОЧНЫХ ПОРОД НИЛАНСКОГО ТЕРРЕЙНА МОНГОЛО-ОХОТСКОГО ОРОГЕННОГО ПОЯСАAGE AND SOURCES OF DETRITAL MATERIAL FOR THE METASEDIMENTARY ROCKS OF THE NILAN TERRANE OF THE MONGOL-OKHOTSK OROGENIC BELTЗаикаВ. А.ZaikaV. A.

675000, Благовещенск, пер. Релочный, 1

1 Relochniy ln, Blagoveshchensk 675000

СорокинА. А.SorokinA. A.

675000, Благовещенск, пер. Релочный, 1

1 Relochniy ln, Blagoveshchensk 675000

ХубановВ. Б.KhubanovV. B.

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

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

КовачВ. П.KovachV. P.

199034, Санкт-Петербург, наб. Макарова, 2

2 Makarov Emb, Saint Petersburg, 199034

Институт геологии и природопользования ДВО РАНРоссияInstitute of Geology and Nature Management, Far Eastern Branch of the Russian Academy of SciencesRussian FederationГеологический институт им. Н.Л. Добрецова СО РАНРоссияDobretsov 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 Federation202210122022135674674Copyright © Заика В.А., Сорокин А.А., Хубанов В.Б., Ковач В.П., 20222022Заика В.А., Сорокин А.А., Хубанов В.Б., Ковач В.П.Zaika V.A., Sorokin A.A., Khubanov V.B., Kovach V.P.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/1585

В статье представлены первые результаты U-Th-Pb (LA-ICP-MS) изотопных исследований зерен детритовых цирконов из палеозойских(?) метаосадочных пород Ниланского террейна Монголо-Охотского орогенного пояса с целью уточнения их возраста, определения возможной корреляции с другими ранее исследованными отложениями этого пояса. Установлено, что метаосадочные породы олгинской, саларинской, ровненской толщ, а также сивакской свиты Ниланского террейна характеризуются практически полным отсутствием раннедокембрийских цирконов, слабоотрицательными значениями εNd(t), мезопротерозойскими величинами tNd(DM) и tNd(С). Совокупность полученных изотопных данных указывает на то, что основной объем обломочного материала при осадконакоплении поступал со стороны континентальных массивов Амурского супертеррейна.

The paper presents the first results of U-Th-Pb (LA-ICP-MS) isotopic dating of detrital zircons from the Paleozoic (?) metasedimentary rocks of the Nilan Terrane of the Mongol-Okhotsk orogenic belt to refine the age estimates and determine their probable correlation with earlier dated sediments of this belt. It has been stated that the metasedimentary rocks of the Olga, Salarin and Rovnen formations and of the Sivak formation of the Nilan terrane are characterized by the almost complete absence of the Early Precambrian zircons, slightly negative εNd(t) values, and Mesoproterozoic tNd(DM) and tNd(С) values. The isotope dataset obtained shows that most of the detrital sediments were carried from continental massifs of the Amur superterrane.

Монголо-Охотский поясU-Pb-геохронологияSm-Nd изотопно-геохимические исследованияНиланский террейндетритовые цирконыисточники сносаMongol-Okhotsk BeltU-Pb geochronologySm-Nd isotopic-geochemical studiesNilan terranedetrital zirconssource areaИсследование выполнено за счет гранта Российского научного фонда № 18-17-00002.The study was done as part of the Russian Science Foundation grant 18-17-00002.ReferencesArizona LaserChron Center, 2022. Available from: https://sites.google.com/laserchron.org/arizonalaserchroncenter/home?pli=1 (Last Accessed August 9, 2022).Arizona LaserChron Center, 2022. Available from: https://sites.google.com/laserchron.org/arizonalaserchroncenter/home?pli=1 (Last Accessed August 9, 2022).Bussien D., Gombojav N., Winkler W., Quadt A., 2011. The Mongol-Okhotsk Belt in Mongolia – An Appraisal of the Geodynamic Development by the Study of Sandstone Provenance and Detrital Zircons. 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The authors declare that there are no conflicts of interest present.