The Permian of the Verkhoyansk–Okhotsk region, NE Russia

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Abstract

This report summarizes data on the Permian deposits of the Verkhoyansk–Okhotsk region (tectonics, paleogeography, fauna, flora and stratigraphy). The Verkhoyansk–Okhotsk region covers the area of the Verkhoyansk fold-and-thrust belt. The Permian deposits of this region were formed on the passive continental margin of the Angarida Continent, the ancient Siberian Continent, situated within the Siberian Platform. This continental margin developed as the result of continental break-up in the Late Precambrian. Late Precambrian to Jurassic (including Permian) sediments were deposited on a passive margin with a continental shelf extending out into an ocean towards the northeast. During the Permian, exclusively terrigenous sediments were deposited over a vast territory in the Verkhoyansk paleobasin forming part of this continental margin. The Permian deposits are divided into six regional stratigraphic units ranked as horizons (=regional stages), which in turn are subdivided into faunal zones and beds serving as the basis for intra-regional correlation. In the Late Jurassic–Cretaceous the continental margin sediments were converted into a foreland fold-and-thrust belt due to the collision of the Siberian Platform with the Kolyma–Omolon and Okhotsk continental blocks.

Introduction

The Permian rock succession in the Verkhoyansk–Okhotsk region attracts considerable interest because it represents a continuous, stratigraphically complete, and well-exposed section with a simple geological structure. The Permian sections are composed predominantly of marine facies that yield goniatites, brachiopods, and bivalves. Regional stratigraphic units are unambiguously correlated with stages of the East European Permian timescale. The Verkhoyansk–Okhotsk region is the key region for solving the main stratigraphic problems of Permian of Siberia.

Section snippets

Outline of the geologic structure

The Verkhoyansk–Okhotsk region lies in the Lena–Yana drainage basin covering the N–S Verkhoyansk fold-and-thrust belt. The Permian deposits of this region were formed on the passive continental margin of the Angarida (or Siberian) Continent which had developed by continental break-up in the Late Precambrian. Late Precambrian to Jurassic (including Permian) sediments formed a continental shelf extending out into an ocean towards the northeast. The Kolyma–Omolon Superterrane and the Okhotsk

Paleogeographic setting

The Permian sediments of the Verkhoyansk–Okhotsk region were deposited in a vast sedimentary basin near the margin of the Angarida Continent, at that time the largest continent of the Northern Hemisphere (Klets, 2004). The sedimentary basin began to fill in the Carboniferous after Tournaisian–Visean rifting, but the Permian was characterized by low relief with widely developed shallow-water facies. This sedimentary facies was developed by successive eastward and northward prograding submarine

Conclusions

The best marine Permian sections of Siberia occur in the Verkhoyansk–Okhotsk region. The entire succession of the Permian terrigenous rocks (sandstones, siltstones and argillites) is about 4–6 km thick. The biostratigraphy and the stratigraphic correlation of these Permian rocks are based mainly on brachiopod and bivalve faunas, but the location of stage boundaries in particular sections are defined mainly by ammonoids. Six regional horizons and 19 biozones have been established for the Permian

Acknowledgements

The work was supported by Russian Academy of Sciences (project 193) and Russian Foundation for Basic Research, Project Nos 02-05-64404, 03-05-96012-Arctic and 04-05-64318. We thank the Guest Editors Guang R. Shi and M.A. Campi, Tony Barber (JAES Editor) and two anonymous reviewers for their reviews and constructive comments.

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