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The main pulse of the Siberian Traps expanded in size and composition

Emplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geo...

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Autores principales: Augland, L. E., Ryabov, V. V., Vernikovsky, V. A., Planke, S., Polozov, A. G., Callegaro, S., Jerram, D. A., Svensen, H. H.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6904769/
https://www.ncbi.nlm.nih.gov/pubmed/31822688
http://dx.doi.org/10.1038/s41598-019-54023-2
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author Augland, L. E.
Ryabov, V. V.
Vernikovsky, V. A.
Planke, S.
Polozov, A. G.
Callegaro, S.
Jerram, D. A.
Svensen, H. H.
author_facet Augland, L. E.
Ryabov, V. V.
Vernikovsky, V. A.
Planke, S.
Polozov, A. G.
Callegaro, S.
Jerram, D. A.
Svensen, H. H.
author_sort Augland, L. E.
collection PubMed
description Emplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geochronological data cannot resolve at a precision better than ~5 m.y. whether (sub)volcanic activity in these areas actually occurred during the main pulse or later. We report the first high precision U-Pb zircon geochronology from two alkaline ultramafic-felsic layered intrusive complexes from Taimyr, showing synchronicity between these and the main Siberian Traps (sub)volcanic pulse, and the presence of a second Dinerian-Smithian pulse. This is the first documentation of felsic intrusive magmatism occurring during the main pulse, testifying to the Siberian Trap’s compositional diversity. Furthermore, the intrusions cut basal basalts of the Taimyr lava stratigraphy hence providing a minimum age of these basalts of 251.64 ± 0.11 Ma. Synchronicity of (sub)volcanic activity between Taimyr and the Siberian Traps imply that the total area of the Siberian Traps main pulse should include a ~300 000 km(2) area north of Norilsk. The vast aerial extent of the (sub)volcanic activity during the Siberian Traps main pulse may explain the severe environmental consequences.
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spelling pubmed-69047692019-12-13 The main pulse of the Siberian Traps expanded in size and composition Augland, L. E. Ryabov, V. V. Vernikovsky, V. A. Planke, S. Polozov, A. G. Callegaro, S. Jerram, D. A. Svensen, H. H. Sci Rep Article Emplacement of large volumes of (sub)volcanic rocks during the main pulse of the Siberian Traps occurred within <1 m.y., coinciding with the end-Permian mass extinction. Volcanics from outside the main Siberian Traps, e.g. Taimyr and West Siberia, have since long been correlated, but existing geochronological data cannot resolve at a precision better than ~5 m.y. whether (sub)volcanic activity in these areas actually occurred during the main pulse or later. We report the first high precision U-Pb zircon geochronology from two alkaline ultramafic-felsic layered intrusive complexes from Taimyr, showing synchronicity between these and the main Siberian Traps (sub)volcanic pulse, and the presence of a second Dinerian-Smithian pulse. This is the first documentation of felsic intrusive magmatism occurring during the main pulse, testifying to the Siberian Trap’s compositional diversity. Furthermore, the intrusions cut basal basalts of the Taimyr lava stratigraphy hence providing a minimum age of these basalts of 251.64 ± 0.11 Ma. Synchronicity of (sub)volcanic activity between Taimyr and the Siberian Traps imply that the total area of the Siberian Traps main pulse should include a ~300 000 km(2) area north of Norilsk. The vast aerial extent of the (sub)volcanic activity during the Siberian Traps main pulse may explain the severe environmental consequences. Nature Publishing Group UK 2019-12-10 /pmc/articles/PMC6904769/ /pubmed/31822688 http://dx.doi.org/10.1038/s41598-019-54023-2 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Augland, L. E.
Ryabov, V. V.
Vernikovsky, V. A.
Planke, S.
Polozov, A. G.
Callegaro, S.
Jerram, D. A.
Svensen, H. H.
The main pulse of the Siberian Traps expanded in size and composition
title The main pulse of the Siberian Traps expanded in size and composition
title_full The main pulse of the Siberian Traps expanded in size and composition
title_fullStr The main pulse of the Siberian Traps expanded in size and composition
title_full_unstemmed The main pulse of the Siberian Traps expanded in size and composition
title_short The main pulse of the Siberian Traps expanded in size and composition
title_sort main pulse of the siberian traps expanded in size and composition
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6904769/
https://www.ncbi.nlm.nih.gov/pubmed/31822688
http://dx.doi.org/10.1038/s41598-019-54023-2
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