Age and Sources of Detrital Zircons from Jurassic Conglomerates of Strelka Depression (Northern Framing of the Mongol–Okhotsk Fold Belt)


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Abstract

This paper presents the results of U–Th–Pb geochronological study of detrital zircons from cement of the Jurassic conglomerates of the Strelka Depression extending in the sublatitudinal direction along the border between the southern margin of the Selenga-Stanovoy superterrane and the Mongol–Okhotsk fold belt. It has been shown that Paleoproterozoic and Neoarchean zircons overwhelmingly dominate in the conglomerate cement. This indicates that the main input of the material to the sedimentation basin was carried from the Southeast border of the North Asian craton (from the north in modern coordinates). In our opinion, the Strelka Depression formed after the completion of orogenic processes associated with the formation of the Mongol–Okhotsk structure.

About the authors

V. A. Zaika

Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences

Email: sorokin@ascnet.ru
Russian Federation, Blagoveshchensk, Amur oblast, 675000

A. A. Sorokin

Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences

Author for correspondence.
Email: sorokin@ascnet.ru
Russian Federation, Blagoveshchensk, Amur oblast, 675000

V. P. Kovach

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sorokin@ascnet.ru
Russian Federation, St. Petersburg, 199034

A. P. Sorokin

Institute of Geology and Nature Management, Far East Branch, Russian Academy of Sciences

Email: sorokin@ascnet.ru
Russian Federation, Blagoveshchensk, Amur oblast, 675000

A. B. Kotov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sorokin@ascnet.ru
Russian Federation, St. Petersburg, 199034

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