Asselian–Sakmarian brachiopod zonation of the left bank of the lower reaches of the Lena River, Northeast Russia

V.I. Makoshin^*, R.V. Kutygin^**

Diamond and Precious Metal Geology Institute, Siberian Branch,

Russian Academy of Sciences, Yakutsk, 677000 Russia

E-mail: ^*makoshin_89@mail.ru, ^**rkutygin@mail.ru 

Received October 11, 2022 

ORIGINAL ARTICLE

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DOI: 10.26907/2542-064X.2022.4.577-589

For citation: Makoshin V.I., Kutygin R.V. Asselian–Sakmarian brachiopod zonation of the left bank of the lower reaches of the Lena River, Northeast Russia. Uchenye Zapiski Kazanskogo Universiteta. Seriya Estestvennye Nauki, 2022, vol. 164, no. 4, pp. 577–589. doi: 10.26907/2542-064X.2022.4.577-589.

Abstract

This article summarizes the results of our study of the Early Permian brachiopods collected 5.9–6.3 km northwest of the village of Chekurovka that were used to develop the first biostratigraphic zonation of the Asselian–Sakmarian deposits on the left bank of the lower reaches of the Lena River. At the base of the Permian section, the Jakutoproductus lenensis Beds were identified. They are overlain by the Jakutoproductus insignis Zone with numerous shells of the index species. The Jakutoproductus terechovi and Jakutoproductus rugosus Zones, which are characterized by index species, occur even higher in the section. The boundary between the Khorokytian and Echian Regional Stages is defined by the first occurrence of J. insignis at the base of the Insignis Zone. The identified zonal sequence is identical to the previously studied Kubalakh section on the right bank of the lower reaches of the Lena River. However, the thickness of the biostratigraphic zones on the left bank is reduced by half, and a significant lower part of the Khorokytian Regional Stage (below the Lenensis Beds) is missing because it falls on the stratigraphic break between the Cambrian and Permian deposits. The zonation performed shows that there is a direct correlation between the Chekurovka section and the Asselian–Sakmarian deposits of Western Verkhoyanie and the Omolon Massif due to common index species of the biostratigraphic units.

Keywords: Lower Permian, biostratigraphy, brachiopods, Jakutoproductus, Khatystakh Formation, Bulkur structural-facies zone

Acknowledgments. We thank I.V. Budnikov (Siberian Research Institute of Geo­logy, Geophysics and Mineral Resources, PhD in Geology and Mineralogy, Head of the Scientific Department), L.G. Peregoedov (Siberian Research Institute of Geology, Geophysics and Mineral Resources, Research Fellow), S.K. Goryaev (Siberian Research Institute of Geology, Geophysics and Mineral Resources, Junior Research Fellow), and A.N. Kilyasov (Diamond and Precious Metal Geology Institute SB RAS, Junior Research Fellow) for participating in the joint field survey, as well as V.G. Ganelin (Geological Institute, Russian Academy of Sciences, PhD in Geology and Mineralogy, Senior Research Fellow) for valuable advice.

The study of the morphology and biostratigraphic sequence of brachiopods was supported by the Russian Science Foundation (project no. 22-77-10028, https://rscf.ru/en/ project/22-77-10028/).

The lithological-stratigraphic study of the section was performed as part of the state assignment to the Diamond and Precious Metal Geology Institute, Siberian Branch, Russian Academy of Sciences (FUEM-2019-0002).

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