gtcrustГеодинамика и тектонофизикаGeodynamics & Tectonophysics2078-502XInstitute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch10.5800/GT-2021-12-4-0559gtcrust-1370Research ArticleПАЛЕОГЕОДИНАМИКАPALEOGEODYNAMICSГЕОХРОНОЛОГИЯ ЧАДОБЕЦКОГО ЩЕЛОЧНО-УЛЬТРАОСНОВНОГО КАРБОНАТИТОВОГО КОМПЛЕКСА (СИБИРСКИЙ КРАТОН): НОВЫЕ U-Pb И Ar-Ar ДАННЫЕGEOCHRONOLOGY OF THE CHADOBETS ALKALINE ULTRAMAFIC CARBONATITE COMPLEX (SIBERIAN CRATON): NEW U-Pb AND Ar-Ar DATAПрокопьевИ. Р.ProkopyevI. R.

630090, Новосибирск, пр-т Академика Коптюга, 3,

630090, Новосибирск, ул. Пирогова, 1

 

Ilya R. Prokopyev

3 Academician Koptyug Ave, Novosibirsk 630090,

1 Pirogova St, Novosibirsk 630090

prokop@igm.nsc.ruДорошкевичА. Г.DoroshkevichA. G.

630090, Новосибирск, пр-т Академика Коптюга, 3,

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

3 Academician Koptyug Ave, Novosibirsk 630090,

6 Sakhyanova St, Ulan-Ude 670047, Buryatian Republic

МалютинаА. В.MalyutinaA. V.

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630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090,

1 Pirogova St, Novosibirsk 630090

СтариковаА. E.StarikovaA. E.

630090, Новосибирск, пр-т Академика Коптюга, 3,

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090,

1 Pirogova St, Novosibirsk 630090

ПономарчукА. В.PonomarchukA. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

СеменоваД. В.SemenovaD. V.

630090, Новосибирск, пр-т Академика Коптюга, 3

3 Academician Koptyug Ave, Novosibirsk 630090

КовалевС. А.KovalevS. A.

630090, Новосибирск, пр-т Академика Коптюга, 3,

630090, Новосибирск, ул. Пирогова, 1

3 Academician Koptyug Ave, Novosibirsk 630090,

1 Pirogova St, Novosibirsk 630090

СавинскийИ. А.SavinskyI. A.

630090, Новосибирск, ул. Пирогова, 1

1 Pirogova St, Novosibirsk 630090

Институт геологии и минералогии им. В.С. Соболева СО РАН; Новосибирский государственный университетРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Novosibirsk State UniversityRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАН; Геологический институт СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences; Geological Institute, Siberian Branch of the Russian Academy of SciencesRussian FederationИнститут геологии и минералогии им. В.С. Соболева СО РАНРоссияSobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of SciencesRussian FederationНовосибирский государственный университетРоссияNovosibirsk State UniversityRussian Federation202114122021124865882Copyright © Прокопьев И.Р., Дорошкевич А.Г., Малютина А.В., Старикова А.E., Пономарчук А.В., Семенова Д.В., Ковалев С.А., Савинский И.А., 20212021Прокопьев И.Р., Дорошкевич А.Г., Малютина А.В., Старикова А.E., Пономарчук А.В., Семенова Д.В., Ковалев С.А., Савинский И.А.Prokopyev I.R., Doroshkevich A.G., Malyutina A.V., Starikova A.E., Ponomarchuk A.V., Semenova D.V., Kovalev S.A., Savinsky I.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/1370

Чадобецкий щелочно-ультраосновной карбонатитовый комплекс расположен на Сибирском кратоне в пределах южной границы активности пермско-триасового плюма. Датирование ксеногенных цирконов из коры выветривания по карбонатитам Чуктуконского массива установило четыре кластера возрастов: 1870–1820, 495–385, 290–210 и 215–162 млн лет. Первые два кластера захваченных возрастов соответствуют датировкам проявления палеопротерозойского гранитоидного магматизма и палеозойской щелочно-базитовой тектономагматической активности, широко проявленных на Сибирском кратоне и в его южном обрамлении. Время кристаллизации щелочных пород Чадобецкого комплекса ложится в интервал 255–240 млн лет. Ar-Ar датирование минералов дамтьернитов и карбонатитов Чуктуконского массива установило интервалы 250.5±3.7 и 247.1±5.7 млн лет соответственно. Время кристаллизации мела-айлликитов и дамтьернитов Теринского массива по данным Ar-Ar датирования отвечает интервалам 257.4±3.9, 241.1±3.7 и 240±3.6 млн лет. Возрастной интервал 215–162 млн лет по цирконам из коры выветривания по карбонатитам Чуктуконского массива отражает геохронологию наложенных процессов и фиксирует различные стадии преобразования магматических пород Чадобецкого комплекса. Полученные данные о возрасте кристаллизации щелочных пород Чадобецкого комплекса согласуются с возрастным интервалом деятельности Сибирского плюма в пределах крупной изверженной провинции (LIP).

The Chadobets alkaline ultramafic carbonatite complex is located on the Siberian craton within the southern boundary of the Permian-Triassic plume activity. The dating of xenogenic zircons from the weathering crust of carbonatites of the Chuktukon complex yielded four clusters with ages of 1870–1820, 495–385, 290–210 and 215–162 Ma. The first two clusters correspond to the dates of activity of Paleoproterozoic granitoid magmatism and Paleozoic alkaline-mafic tectono-magmatic activity, widely occurred in the Siberian craton and its southern framing. The age of crystallization of alkaline rocks of the Chadobets complex falls within the interval of 255–240 Ma. Ar-Ar dating of damtjernite and carbonatite minerals of the Chuktukon complex falls within the intervals of 250.5±3.7 and 247.1±5.7 Ma, respectively. The crystallization ages of the mela-aillikites and damtjernites of the Terina complex, according to the Ar-Ar dating, correspond to the intervals of 257.4±3.9, 241.1±3.7, and 240±3.6 Ma. The age interval of 215–162 Ma based on zircons from the carbonatite weathering crust of the Chuktukon complex reflects the geochronology of superimposed processes and indicates the different stages of alteration of igneous rocks of the Chadobets complex. The data obtained on the age of crystallization of alkaline rocks of the Chadobets complex are consistent with the age interval of Siberian plume activity within a large igneous province (LIP).

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