References

gtcrust

Геодинамика и тектонофизика

Geodynamics & Tectonophysics

2078-502X

Institute of the Earth's crust of the Russian Academy of Sciences, Siberian Branch

10.5800/GT-2019-10-3-0442

gtcrust-900

Research Article

ПАЛЕОГЕОДИНАМИКА

PALEOGEODYNAMICS

ВОЗРАСТ И ИСТОЧНИКИ ОБЛОМОЧНЫХ ЦИРКОНОВ ИЗ РАННЕМЕЗОЗОЙСКИХ МЕТАОСАДОЧНЫХ ПОРОД УНЬЯ-БОМСКОГО ТЕРРЕЙНА МОНГОЛО-ОХОТСКОГО СКЛАДЧАТОГО ПОЯСА: РЕЗУЛЬТАТЫ U-TH-PB И LU-HF ИЗОТОПНЫХ ИССЛЕДОВАНИЙ

AGES AND SOURCES OF DETRITAL ZIRCONS FROM THE EARLY MESOZOIC METASEDIMENTARY ROCKS OF THE UN’YA-BOM TERRANE OF THE MONGOL-OKHOTSK FOLD BELT: RESULTS OF U-TH-PB AND LU-HF ISOTOPE STUDIES

https://orcid.org/0000-0003-2842-0608

Заика

В. А.

Zaika

V. A.

Заика Виктор Александрович - аспирант, младший научный сотрудник.

675000, Благовещенск, пер. Рёлочный, 1.

Viktor A. Zaika - Post-Graduate Student, Junior Researcher.

1 Relochniy lane, Blagoveshchensk 675000.

zaikava@ignm.ru

https://orcid.org/0000-0002-8879-5412

Сорокин

А. А.

Sorokin

A. A.

Сорокин Андрей Анатольевич - доктор геолого-минералогических наук, директор, заведующий лабораторией.

675000, Благовещенск, пер. Рёлочный, 1.

Andrey A. Sorokin - Doctor of Geology and Mineralogy, Director, Head of Laboratory.

1 Relochniy lane, Blagoveshchensk 675000.

sorokin@ascnet.ru

Институт геологии и природопользования ДВО РАНРоссияInstitute of Geology and Natural Management, Far East Branch of RASRussian Federation

2019

15092019

103801813

2019

Заика В.А., Сорокин А.А.

Zaika V.A., Sorokin A.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/900

В данном сообщении представлены результаты U-Pb и Lu-Hf изотопных исследований детритовых цирконов из метатерригенных отложений (нелская, курнальская, амканская свита) Унья-Бомского террейна восточной части Монголо-Охотского складчатого пояса. Установлено, что конкордантный возраст наиболее молодого циркона в метаалевролите нелской свиты составляет 213±3.6 млн лет, метаалевролите курнальской свиты – 194±4.4 млн лет, метаалевролите амканской свиты – 202±2.5 млн лет. C учетом полученных данных, предполагаемый ранее среднеюрский возраст амканской свиты становится сомнительным. Скорее всего, курнальская и амканская свиты имеют один и тот же (раннеюрский) возраст. В любом случае взаимоотношение этих свит требует уточнения. Эти данные в совокупности с ранее проведенными исследованиями Тукурингрского террейна указывают на то, что раннемезозойские осадочные комплексы в строении восточной части Монголо-Охотского пояса развиты существенно шире, чем принято считать в настоящее время. На основе полученных данных показано, что поступление материала в период накопления нелской, курнальской и амканской свит происходило из разных провинций, а именно со стороны Амурского супертеррейна (с юга в современных координатах) и со стороны обрамления Северо-Азиатского кратона (с севера в современных координатах), однако вклад последнего источника был незначительным.

The U-Pb and Lu-Hf isotope studies have been performed to investigate detrital zircons from metaterrigenous deposits (Nel, Kurnal and Amkan formations) of the Un’ya-Bom terrane of the eastern part of the Mongol-Okhotsk fold belt. The concordant ages of the youngest zircon in the metasiltstone of the studiedformations are as follows: 213±3.6 Ma –Nel, 194±4.4 Ma –Kurnal, and 202±2.5 Ma – Amkan. The new data suggest that a previouslyassumed(Middle Jurassic) age of the Amkan formation is uncertain. Most likely, the Kurnal and Amkan formations are of the same (Early Jurassic) age. In any case, a relationship between these formations needs to be clarified. In combination with the data from previous studies of the Tukuringra terrane, our study results show that the Early Mesozoic sedimentary rocks in the structure of the eastern part of the Mongol-Okhotsk fold belt are more abundant than it is currently assumed. Our study results suggest that during the accumulation of the Nel, Kurnal and Amkan formations, the materials were supplied from different provinces, especially from the Amur superterrane (i.e. from the south, in modern coordinates), as well as from the frame of the North Asian craton (i.e from the north, in modern coordinates), although the contribution of the craton source was insignificant.

Монголо-Охотский складчатый поясУнья-Бомский террейнU-Th-Pb и Lu-Hf изотопные исследованияметаосадочные породыдетритовые цирконы

Mongol-Okhotsk fold beltUn’ya-Bom terraneU-Th-Pb and Lu-Hf isotopic studiesmetasedimentary rocksdetrital zircons

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