Новые результаты комплексного литолого-фациального и биостратиграфического изучения осинского горизонта нижнего кембрия юга Сибирской платформы (Большетирская скв. 7)

Translated title of the contribution: New results of integrated lithofacies and biostratigraphical study of the Lower Cambrian Osa horizon in the south of the Siberian platform (Bolshetirskaya 7 well)

D. A. Tokarev, A. V. Plyusnin, A. A. Terleev, N. A. Ivanova, I. V. Varaksina, A. V. Lipyanina

Research output: Contribution to journalArticlepeer-review

Abstract

The section of the Osa Subformation of the Usolka Formation of the Lower Cambrian Tommotian stage penetrated by the Bolshetirskaya 7 well in the south of the Nepa-Botuoba anteclise has been studied. As a result of lithological-facies investigations, seven lithological types of rocks were identified, they are regularly replaced by each other along the section. Facies environments of the reef complex were dеtected: bar bank, rear part of the reef, organogenic bioherm bildup, reef rear bars, reef buildup, core of reef buildup. In the section of the subformation, three fourth-order sequences are identified. The sequence boundaries are fixed by subaerial hiatuses represented in the core by sedimentation breccias, karst zones. The largest lowering of sea level, in terms of amplitude and duration, is confined to the border of the second and third sequences. The conducted biostratigraphic analysis confirms the Lower Cambrian age. Remains of calcareous algae Renalcis polymorphum, R. gelatinosum, R. granosum, Botomaella zelenovi were found. Small shell fauna of the genus of Namacalathus Grotzinger, Watters et Knoll. also was found. It has global distribution in the Lower Vendian (Ediacaran) deposits in Namibia, Brazil, Canada, Oman, Spain, China, Russia, etc.

Translated title of the contributionNew results of integrated lithofacies and biostratigraphical study of the Lower Cambrian Osa horizon in the south of the Siberian platform (Bolshetirskaya 7 well)
Original languageRussian
Article number5
Pages (from-to)56-66
Number of pages11
JournalGeology and Mineral Resources of Siberia
Issue number2 (46)
DOIs
Publication statusPublished - 2021

Keywords

  • Archaeocyatha
  • Cambrian
  • Cyanobacteriae
  • East Siberia
  • Organogenic buildups
  • Osa Horizon
  • Sequence-stratigraphic analysis

OECD FOS+WOS

  • 1.05 EARTH AND RELATED ENVIRONMENTAL SCIENCES
  • 1.05.GC GEOCHEMISTRY & GEOPHYSICS
  • 1.05.KY GEOLOGY

State classification of scientific and technological information

  • 38 GEOLOGY

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