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The key section for the Upper Palaeozoic of the New Siberian Islands (Tas-Ary Peninsula, Kotel’ny Is.)статья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 28 февраля 2020 г.
- Авторы: Danukalova M.K., Kuzmichev A.B., Ganelin V.G., Gatovsky Yu A., Kossovaya O.L., Isakova T.N., Weyer D., Astashkin N.G., Eriklintsev V.V.
- Журнал: Stratigraphy and Geological Correlation
- Том: 27
- Номер: 7
- Год издания: 2019
- Издательство: Pleiades Publishing, Inc.
- Местоположение издательства: New York, USA
- Первая страница: 729
- Последняя страница: 782
- DOI: 10.1134/S0869593819070013
- Аннотация: The information on the Late Paleozoic deposits of the New Siberian Islands is essential to clarify the paleogeography of the surrounding Arctic Region and to quest the original location of the New Siberian continental block prior to the Amerasian ocean opening. The best Upper Palaeozoic section of the islands, located in the western part of the Kotelny Island (Tas-Ary Peninsula), was examined in detail. The studied rocks characterize a transitional facial zone between the northeastern shallow-water (central areas of the Kotelny Island) and the southwestern deep-water areas (Belkovsky Island). The stratigraphy of the Carboniferous and partly Permian strata was established by the study of four fauna groups, detrital zircon dating, and structure interpretation. The section demonstrates a gradual change of depositional environments from shallow-marine in the Lower Carboniferous to deep-water in the Middle Carboniferous and Permian. The Tournaisian and Visean rocks (Tas-Ary Formation, not less than 950 m) were formed on the open shelf or ramp with predominant carbonate sedimentation. They were deposited above the storm-wave base during the early Tournaisian and at greater depth later. The Serpukhovian–Middle (?) Permian rocks (Bel’kov Formation, not less than 300 m) were accumulated on the deep-water subaqueous slope and, possibly, at its base. Black shales and turbidite sandstones compose a significant part of the Bel’kov Formation. Sandstones have a siliciclastic–carbonate composition in the upper Lower Carboniferous and are carbonate-free up the section. The boundary between Tas-Ary and Bel’kov formations corresponds to a change in the shelf-to-basin profile and depositional style. At this time (the beginning of the Serpukhovian), the subsidence rate increased, a pronounced slope was formed, and a new source of clastics appeared on land. This reorganization was probably related to the Northern Taimyr orogen rise. The lithological similarity of the Lower Carboniferous deposits of the Tas-Ary Peninsula and Southern Taimyr, the synchronous shift in sedimentation from carbonate to terrigenous rocks, and the same source of clastic material for the Upper Carboniferous–Permian sandstones in both regions indicate their belonging to the same sedimentary basin in the Late Paleozoic. We believe that the western part of the New Siberian Islands represented a continental margin in Late Devonian, Carboniferous and Permian times, and that it was a continuation of the Verkhoyansk margin. The latter is possible, taking into account rotation of the New Siberian Islands block according to the two-pole rotational model of the Amerasian basin opening.
- Добавил в систему: Гатовский Юрий Артурович